Electrical Engineering and Automation

The following sections are included:

• Preface
• General Chair
• Committee
• Keynote Speakers
• Contents

In order to build the stator winding fault model of the asynchronous motor in the highspeed train system, anew state-space representation of the dynamic equations by using the Park’s vector method is proposed. Compared with the flux linkage variable, the stator current as state variables is chosen to determine the stator current and diagnose the stator fault timely, which is important in the high-speed train. The simulation results prove the effectiveness of the approach.

DSP (XC2267) is the main control chip which does the increment PI algorithms and realizes the voltage and current double closed-loop control. Three-phase thyristor rectifier method based on the phase self-adjusting of FPGA is proposed. A method for sweptfrequency start circuit is designed to implement the transition between the high-power and low-power. The invert system uses the compound control of improved PWM and frequency phase lock to improve the control accuracy and efficiency. Lastly, by using bench, the circuit is tested and the feasibility and effectiveness of the whole system are verified.

This paper studies a fiber optic perimeter security system based on dual Mach Zehnder interferometer. The structure and principles of the system are analyzed. With the capture card, photoelectric detectors and other hardware circuit designed, this paper points out the key factors that cause the error of the system, and puts forward some measures to improve it. The experimental results show that the wavelet denoising and improved cross-correlation algorithm have significant effect to improve the positioning accuracy.

The recycled-water system is a complicated multi-input and multi-output process. Stable pressure of the pipe and the level of sump in recycled-water system are greatly needed in a concentration process, but there is strong coupling between them. Distributed PID and decoupling control algorithm are applied respectively, and simulation research is carried out based on the model. The results showed that the application of feedback compensation decoupling scheme achieved good results. It solved recycled-water into two independent systems.

With the rapid development of information science and engineering technology, nonlinear problems become an important research in the field of numerical analysis. In this paper, iterative methods for solving nonlinear equations are researched. Two modified Newton-type algorithms for solving nonlinear equations are proposed and analyzed, whose order of convergence are six and seven respectively. Both of the methods are free from second derivatives. The efficiency index of the presented methods are 1.431 and 1.476, respectively, which are all better than that of the classical Newton’s method 1.414. Some numerical experiments demonstrate the performance of the presented algorithms.

The condition of urban rail transit equipment is an important factor affecting the health of its security operation, so an equipment maintenance strategy should be reasonably determined. This paper established Markov-Switching model to simulate the aging process of equipment as well as the recovery level of equipment maintenance, calculating the state transition probability matrix corresponding with the special strategy. The optimum strategy based on Markov decision-making stands on the point of economic effect and the reliability of equipment. Meanwhile, this paper used policy iteration method to obtain comprehensive expected maintenance cost. Further study claimed different loss cost of fault condition has different impacts on the optimal maintenance strategy, which proves this method is reasonable. It provides a theoretical basis for rail maintenance personnel on-site maintenance and decision making.

Based on the temperature data of 34 years in Sichuan Province from 1980 to 2013, the frequency of cold air activity interannual variability and regional space-time variation characteristics of cold air activities were analyzed. After the partition of Sichuan Province, the overall space-time distribution of cold air was focused. Based on the review, it is recognized that cold air activity average frequency in Sichuan decreases from west to east, which means that the cold air activity decreases from west to east. Because of the impacts of the circulation feature and the landscape terrain in winter months, it is colder in western Sichuan than central and eastern regions. With increasing time, the amount of cold air produces a fluctuating trend and the overall trend has weakened with occasional mutations.

A new method of investigating the so-called quasilinear strongly-damped wave equations is proposed in this paper, concerned with controllability in a steady state for the Quasilinear Wave Equations with weak decay. A so-called energy perturbation method to establish weak controllability of solutions in terms of energy norm for a class of nonlinear functions is presented. This method establishes the existence and uniqueness of energy solutions and the existence of finite-dimensional global and exponential attractors for the solution semigroup associated with that equation and their additional regularity. Controllability in a steady state with the help of differential inequalities by estimating the relationship between energy inequalities and attenuating property of weak solutions is demonstrated. A small positive number is determined and derived differential inequalities by using a perturbation of energy.

The paper proposes to build physical model of locating mechanism that is made up of pointing mechanism and multi-parallel bars mechanism. It researches on its kinematic and dynamic characteristics and establishes its kinematic model and dynamic model. The characteristics of the whole system are determined through the research of its mathematical model and simulates the model on software platform and compares with the results obtained from the mathematical model. It also verifies the validity of the relevant mathematical model to achieve academic solutions such as kinematic and dynamic regular pattern and change law of the driving force. The research conclusion can be used for the engineering application of the mechanism.

Modern system has become increasingly complex to design and build. Once a system has been built, it is also difficult to detect if it is a stabilizing when some error happened. Predict the cascading failure and decrease the probability of it is a central issue in the research of complex network. Predicting the cascading failure before it happens is still a popular issue. The paper has made a model to describe the cascading failure base on a classical queuing theory model M^[k]/M/1 to compare with the model Coupled Map Lattices (CML). The proposed model not only can describe the process and the scale of the failure as CML, but it can also give a prediction for the failure. It serves as a useful guide before building a complex system. It can also give a standard for the stability of the proposed network.

In order to meet the performance test demand for the directivity of loudspeaker, this paper compared and analyzed the directivity of the different loudspeakers. The automatic test system for the directivity of loudspeaker had been designed. The structure and main functions were introduced in detail. The test method for the loudspeaker directivity in the free acoustic field was also researched. The directivities of the different loudspeakers were tested and the directivity patterns were drawn. The experimental result shows that this system is reliable and easy to operate. To the greatest extent, it reduced the error in the test process because of the reflection, better practical application value to the directivity of loudspeakers and performance test to another acoustic measuring instrument.

The traditional GNSS relative positioning precision test is unitary, so it is applied in limited scope. On the basis of analyzing linear combination of dual-frequency wide lane observation method of ambiguity solution and the traditional method of relative positioning precision test, the paper discusses the method based on the comparison of the real-time relative baseline-length between two vehicles. Precision test methods are proposed respectively in the conditions of static positioning and dynamic positioning. In addition, the characteristics of each method is compared. For validity, some experimental data is provided and analyzed, in which the dual frequency wide-lane observation for ambiguity solution is used in dual dynamic positioning.

To address the imbalance classification tasks, a method for Cost-sensitive Majority Weighted Minority Oversampling (CS-MWMOS) technique was proposed. The betweenclass and inner-class imbalance problem of the sample distribution are synthetically considered. Imbalance ratio was introduced to alleviate between-class imbalance issue. The inner-class imbalance problem is also reduced by allocating different weights for minority sample. Extensive experiments on 20 UCI imbalance datasets showed that the proposed method can effectively address the class imbalance problem in terms of the geometric mean and average accuracy assessment metrics.

The 500W@4.5K helium refrigerator was designed to provide forced-flow cooling of 4.5 K supercritical helium for the superconducting coils testing or as a helium liquefier with the capacity of 150 L/hr liquefaction rate. Its control system was designed and developed based on the Programmable Logic Controller (PLC) to achieve automatic process supervisory and control in each defined operational mode. Via the analysis of process flow and control requirements, all operational modes with their logic control were designed. Through the dynamic simulation, the dynamic behaviors of cryogenic process were revealed and the process parameters control loops were designed and simulated for optimizing the cool-down process. The cryogenic instrumentation and control as well as the cryogenic commissioning results will be presented in this paper. It shows that the application of control and automation in the home-made helium refrigerator of hundredwatt class is successful.

The most prominent advantage of workspace Measuring and Positioning System (wMPS) is to solve the confliction between measurement range and measurement accuracy in large-scale measurement field. Due to the layout of system network has a great impact on measurement range, accuracy and cost, system layout optimization method using intelligent algorithms was researched in this paper. Firstly, layout optimization model was established on the basis of the above three objectives. Then the simulated annealing algorithm and particle swarm algorithm were combined to get the global optimal deployment, which was able to realize complete coverage of the measurement range and meet the measurement accuracy requirements at the lowest possible cost. Finally, the effectiveness of the optimization method was demonstrated by experiment, of which the result shows that using simulated annealing-particle swarm algorithm, the overall positioning error of ten-station system has been improved 0.04mm averagely. This method is also suitable for the layout optimization of angle intersection measuring system and not limited by the number of stations.

In view of collaborative development environment web services supplier in ability, cost, time, supplier relations and component relevance information under uncertainty problems. The fuzzy multi-objective task assignment model of web services are built in a collaborative development environment. Using α cut sets and extension principle to simplify the fuzzy multi-objective assignment mode, we get the solution of simplified assignment model via the Genetic and simulated-annealing algorithm. Finally, the simulation results verify the feasibility of the proposed method, which can ensure the suppliers’ tasking in successive software project in collaborative development environment.

In order to estimate the duty cycle of pulsed interference in Global Navigation Satellite System (GNSS), a simple but effective algorithm is proposed based on the consecutive mean excision and binary integration techniques. The proposed algorithm has less computational and logic complexity compared to the localization algorithm based on double-thresholding with adjacent cluster combining (LAD-ACC). Simulation results show that the proposed algorithm can compute the duty cycle of pulsed interference as accurately as the LAD-ACC algorithm does.

This paper deals with the problem of adaptive control of a class of linear systems. The linear system contains unknown parameters and matched general periodic disturbance. The period of the disturbance is assumed to be known. A novel adaptive control method is presented, which consists of differential adaptive control laws and difference adaptive control laws. The adaptive control method can guarantee that all signals in the closed loop system are bounded and the state vector converges to zero.

Energizing a de-energized distribution feeder safely has received particular attention by power companies. Hence, a fault detection technology for de-energized distribution lines is proposed in this paper to improve reliability of the closing. An inverter is connected to the low voltage side of any transformer of the distribution feeders by the thyristor bridge. When the de-energized line needs to be restored, the electrician can control the thyristor to apply instantaneous high-voltage to the line. Then, the current responses are analyzed to detect whether a fault exists. The effectiveness of the proposed technology has been verified with theoretical calculation and simulation.

Knowledge on the characteristics of regional evacuation in hazardous gas leakage in metropolises plays a critical role. A comprehensive risk analysis model for personal decision-making is established in order to guide residents to make appropriate personal emergency response plan in hazardous gas leakage. The model was developed considering eight influencing factors, type and flow rate of hazardous gas, location of leakage source, wind speed and direction, information acquirement time, leakage duration, state of window (open/closed), and personal inhalation. Using Beijing as a case study, the risk of all grids and people based on standard condition were calculated and also obtained the three dimensional special risk distribution. Through the microcosmic personal evacuation simulation in different condition, detailed data were obtained to analyze personal decision-making. The results provided useful references for efficient regional evacuation planning in hazardous gas leakage scenarios in metropolises.

Accidents of fuel leakage occur frequently during transport and storage. Numerical simulation of fuel spreading is very helpful for risk analysis and accidents prevention. However, most of current studies on fuel spreading paid attention to water surface or flat ground. Therefore, it is almost impossible to simulate fuel spreading accurately under real accident scenarios due to the lack of simulation model on complex topography. In this paper, a simulation model for fuel spreading on complex topography was established based on hydrodynamics. Many details were improved to make the model suitable for simulation of fuel spreading. The effectiveness of model is verified using experimental data. The model is applied to an actual oil depot for oil leakage simulation, then the spatial-temporal distributions of oil depth were obtained. The simulation model plays a critical role in risk analysis of overland fuel leakage.

Considering the design variables and the uncertainty of design parameters, a robust optimization design method of two stage mechanical structure model based on multidisciplinary interval is proposed. The first stage simplifies multi-disciplinary uncertainty optimization three nested loop optimization architectures, to determine two nested loop optimization architectures. The second stage is to use the nearest value method to continuous variables discretization and obtain the optimized dimensions of the discrete structure with tolerance. The engineering example shows that the proposed method has strong feasibility and validity with practical value.

A new kind of Opposite Axial Piston Engine (OAPE) in small scale specially designed for the portable generating system was presented. The working theory of OAPE was studied, based on which the combustion process was simulated in FLUENT. Then the internal flow field and the variation of temperature and pressure in cylinder were recorded. Results show the flame front is a sphere centered at the spark point. The maximal pressure in power cylinder is 2.13Mpa and maximal pressure in charge cylinder is 0.235Mpa. The work done by power cylinder per cycle is 1.24J, while the charge cylinder consumes 0.22J per cycle.

Hot-line robot is a safe, reliable and efficient manner used to repair and inspect highvoltage transmission lines. According to the characteristics of obstacles on line such as damper, strain clamp, insulators, a mechanical structure for hot-line robot is devised. Firstly, the configuration of robot’s different parts is fully explained. Then, a motion planning for obstacle climbing and lifting is proposed, using Solidworks COSMOS Motion software to analyze and simulate for the motion. Finally, dynamics analysis is determined for the running gear of robot. The motion simulation verifies the feasibility of mechanical structure and dynamics analysis succeeds in calculating the maximum of climbing angle.

DEM and CFD methods are proposed to study the dynamic contamination depositing characteristics of the insulator surface, established the movement model of particles, the contact and adhesion model, the agglomeration model and the removal model. Through the analysis and simulation of the contamination model, the pollution distribution on the insulator surface, the critical normal initial velocity of particle desorption, the effect of removal by wind are determined. The research result shows that particles with diameter below 20μm primarily deposit on the lower surface through drag force while particles over 50μm mainly deposit on the upper surface through gravity sedimentation. Half fill angel of liquid bridge is the most important factor. The larger the half fill angle is, the better absorbability the insulator gets. The contact angle is the least factor and the particles have the best absorbability when the contact angle is 25°. The critical normal initial velocity and the adhesion ability increase with the decreasing of the particle diameter and it will be easier for bigger particles to be separated from surface. The dynamic removal efficiency of the upper surface is greater than the lower surface and the particles that have adhered to the surface cannot be effectively removed by wind. This paper describes the complete dynamic depositing stages of particles to analyze the contamination on insulator that has never been done before.

In order to improve the level of performance test for electronic circuit board, some key techniques as analog isolation acquisition, standard test signals generation and test software architecture design were discussed in this paper. The hardware components and its selection principle of the techniques were discussed. The design idea and structure of the technique software developed by the LabVIEW software development platform was introduced in detail. Finally, practical application shows that the key technologies studied in this paper can significantly improve the precision and efficiency of electronic circuit board performance test.

This paper presents a cascaded type switched-capacitor converter in the ac-ac field. The converter topology is described and analyzed. The main advantage of this proposed converter is the absence of magnetic elements which significantly reduces its volume and improves the efficiency. Based on the principle of switched-capacitor, the double/single-leg cascaded converter is able to achieve a fixed conversion ratio of 1/4 for the step-down configuration and a ratio of 4 for the step-up configuration. The theoretical analysis of the equivalent resistance of the converter is given and a prototype of 150w, 220V_rms high-side voltage, 55V_rms low-side voltage and switching frequency of 50kHz is built to verify the correctness through experimental results.

Soft-switching equipment is used for switching load softly among power phases without powering down the system, whose key component is a single-phase inverter. The equipment is designed to solve the three-phase unbalanced problems of small power supply from load-side. This paper presents a new topology of soft-switching equipment. In order to solve the grid-connected circulation problem at the voltage mode, built-in load is designed. Then the mathematical model of transfer function is built for analyzing the reason circulation is inhibited when the equipment with built-in load is grid-connected. In this case, it would produce smaller magnitude difference. The design method for the parameter of built-in load is given. Finally, it is verified through experiments that built-in load can restrain circulation current and the correctness of theoretical analysis are proved.

Aiming at the problem of complicated structure and difficulty of analyzing electromagnetic interference of the drive system in the electric vehicle, a combination simulation method using several software packages is proposed to analyze the electromagnetic radiation distribution law of the Direct Current (DC) link. Firstly, the electric vehicle control model is built in MATLAB. Secondly, the geometric model of the vehicle body is built in CATIA and meshed in Hypermesh. Thirdly, the mesh model is integrated in FEKO and the DC link cable is modeled. Finally, the electromagnetic radiation distribution law is computed based on the DC link current measured from the control model used as the excitation source. The result verifies its efficiency and convenience.

Based on grid icing observation data of Erlang Mountain region in the winter during 2013-2014, the characteristics of the grid icing in the regional Erlang Mountain and time variations were researched. The regional power grid and icing intensity classified into mild, moderate, severe icing, and ice characteristics of the growth process were also studied. Air temperature, wind direction, wind speed and other meteorological elements were discussed in the influence of the strength of the power grid ice. The results showed that: (1) in Erlang mountain areas, most icing are mild to moderate icing, severe icing phenomenon is relatively rare, except for the special effects of the weather system. (2) When the temperature is low, roughly -5 °C ∼ -8 °C is the most conducive to ice crystals due to the air in the water, constant humidity and the lower the air temperature, the faster the ice formation. Certain temperature and humidity result in longer freezing and thicker ice. Wind speed plays a role in transporting water vapor and water droplets have an important influence on the formation of ice. This study demonstrates when the wind speed is at 2 ∼ 6m/s, ice forms the fastest. (3) Temperature, wind speed and quantitative relationship of ice thickness are linear correlation.

A decentralized variable structure generator steam valve controller is designed for stability enhancement and dynamic performance of multi-machine power system. Adaptive back stepping method, block control approach and variable structure control are combined to effectively deal with unmatched uncertainties of multi-machine power system and possess good dynamic performance. The simulative results of the two-area four-machine power system demonstrates that the designed controller restrains the power oscillation quickly. It not only improves the system stability effectively, but also possesses good robustness to disturbance.

According to statistics, half of the grid loss occurred in the distribution systems, of which line loss is of considerable portion. Since distribution systems are normally connected by a radial network into a ring network to improve reliability, collectively, impact due to the line loss are mulitpled. Threfore, it is important to invitagate issue to idenify problem to compensate for line loss in loop distribution systems. This paper analyzes the criteria required to minimize line loss, and compensation by HUPFC. It is proved by the simulation results based on MATLAB/ Simulink.

The background and significance of the image fusion research in production safety are researched in this paper. The hardware configurations are described and the principles of image fusion are analyzed. A suitable method for infrared image and visible image fusion for product safety is proposed. The data processing ways are demonstrated. The effects of the fusion system are displayed and analyzed.

In this paper, power transmission characteristics and main circuit phase angle characteristics of PSS type Inductively Coupled Power Transfer (ICPT) system are analyzed. In general, increasing the resonance frequency of the system can improve the power transmission capability of the system, but output power of PSS compensator topology is found to decrease with increasing resonance frequency. The PSS compensation topology has the feature that can transfer rated voltage with high variation of coefficient of coupling. This paper analyzes the system transmission efficiency and phase angle variation in the voltage range with a constant coupling coefficient. The feasibility of the design method is certified by experimental results.

An infrared temperature prediction method for power equipment is proposed based on the Radial Basis Function (RBF) network optimized by Quantum Genetic Algorithm (QGA) and Orthogonal Least Squares Algorithm (OLSA). The modified compound algorithm was used to optimize parameters of the RBF network. A temperature prediction model was established through the fitting of pixels and temperatures of the infrared image of an equipment. After image matching, the infrared temperature, at a position can be directly obtained from the visible image. Meanwhile, temperature values of different positions from the infrared image can also be directly read and identify the corresponding positions in the visible image. Experimental results indicate that the algorithm proposed has a better prediction performance than the RBF network optimized by OLSA alone and by Adaptive Genetic Algorithm (AGA) and OLSA. It improves the generalization capacity of RBF network, resulting in a more stable input and a higher prediction accuracy. The algorithm proposed facilitates temperature analysis and condition-based maintenance for substations.

In this paper, the reasonable matching mathematical model proposes a multiple power supply structure power grid with a certain capacity based on the analysis of the unreasonable structure of Jilin province power grid. According to the mathematical model, a reasonable matching of power supply in Jilin province is analyzed and the principle and development direction of the future power supply in Jilin province are proposed.

Different considerations of the load in the calculation of the short-circuit current may cause different short-circuit current calculation results. In this paper, the influence of the static load and the induction motor on the short-circuit current is analyzed and the mechanism of the effect of various loads on the short-circuit current is demonstrated.

Multi-motor variable speed drive system is widely used in electric applications. Since multiphase machines have additional degree of freedom than three-phase machines, it can be utilized to control other machines. Dual Three-phase (DTP) machine can connect in series with another DTP machine or a two-phase (TP) machine or one DTP machine and one TP machine by an appropriate phase transposition, supplied from a single multiphase inverter. Based on the Permanent Magnet Synchronous Motor (PMSM) as the research object, a detailed mathematical modeling of the three series-connected system and the phase transposition rules were proposed. Using Direct Torque Control based on Space Vector pulse width Modulation (SVM-DTC) technology for series-connected system, the method of SVM technology was modified to obtain the full dc bus voltage. The simulation results verified this developed SVM technology.

Overhead transmission lines are important carrier transporting the electric energy from the generating end to the receiving end. In this paper, key scientific issues such as structural design, strengthening mechanism and conductive characteristics, which mainly influence the development of aluminum conductors were discussed briefly. In structural design, commercially pure aluminum wire has excellent electrical conductivity, but its strength is very low, and thus combining the high conductive aluminum wire with the high strength steel wire may exhibit outstanding comprehensive properties. In the aspect of strengthening mechanism, solid solution, precipitation hardening, work hardening and fine grain strengthening are important strengthening mechanisms which are commonly applied to strengthen the conductive materials. Sometimes single mechanism can be applied, and also sometimes several mechanisms can be used together when applying these mechanisms. In the aspect of conductivity, boron was usually adopted to make the impurity elements precipitate from the liquid metal by the way of gravity sedimentation in order to purify the matrix of aluminum and its alloys, and finally the electrical conductivity of aluminum wire was improved. In the past ten years, T-81 and HPT techniques were applied to aluminum conductors one after another, and they improved the electrical conductivity of aluminum wires as well as the mechanical properties. However, some of these new techniques still cannot be applied in the conductor field constrained by their disadvantages, and these techniques are still waiting to be transformed into techniques in the preparation of aluminum conductors. In the future, more new techniques are needed to solve the problems from development of high strength-high conductive conductors for the purpose of breaking the bottleneck, which impedes the development of aluminum conductors. Developing some outstanding aluminum conductors is beneficial to the development of human society.

This paper achieves a new method to charge the vehicle when it is running on the road. Generally, the power is transferred through a capacitor composed of a steel belt covering the tire and a metal pathway attached to the road. First, it demonstrates a new theory. The transmission of electrical energy is mainly due to the capacitor among the vehicle and we seek for the peak of the voltage by LC resonance. Therefore the electricity is transferred in the way of displacement current and electrical field coupling. Then the paper concentrates on the circuit design and simulation, utilizing COMSOL Metaphysics and ADS 2009. The appropriate capacitance and other parameters for the vehicle are attained when reaching the peak voltage, including the resonance frequency, the value of inductance and the transfer functions. In the system, the capacity between the pathways is 12pF, the capacity between the tire and pathway is 23pF, the capacity between the tires is 11pF. For simulation, when a 68µH inductance is added in the circuit, the system achieved a LC resonance at the frequency of 1.9MHz. Taking a LED light as the load for experiment, the charging efficiency can be roughly assessed. The result showed the LED light reached peak current at the frequency of 1.95MHz, which matches well with the simulation result. This proved the feasibility of the method mentioned above for wireless power transmission..

To achieve the comprehensive evaluation on energy utilization scheme of smart parks, an evaluation index system of energy utilization scheme of the parks is established and a comprehensive effectiveness evaluation method based on entropy weight method for energy utilization of smart parks is proposed in the paper. Firstly, the importance of the energy utilization effectiveness index, i.e. the index weight, is quantized by using entropy. Secondly, the relative approach degree from the energy utilization effectiveness index to corresponding ideal optimal index sample is calculated by using the technique for order preference by similarity to an ideal solution (TOPSIS) method, and the comprehensive effectiveness evaluation of energy utilization schemes is achieved by comparing with the relative approach degrees. The indexes, such as N-1 rate of the distribution network, reliability rate of power supply, average failure recovery time, voltage limitation index, new energy power generation proportion, average emission reduction and average energy consumption index, are mainly selected in the index system. Finally, the effectiveness and feasibility of the presented comprehensive evaluation scheme is verified by using comprehensive effectiveness evaluation on three parks.

A phase-to-phase fault detection method is proposed in this paper to prevent breaker to close to a de-energized distribution line with fault. An inverter source connected to the low-side of service transformer is controlled by Thyristor Bridge to momentarily inject a transient high voltage to the de-energized feeders. Fault existence can be judged by detecting and analyzing the voltage waveform near the downstream side of the breaker. The method does not need communication and can be used for both adaptive reclosure and safely closing to a feeder de-energized for an extended period.

Coal, petroleum and natural gas will remaim the basis power house in drving economic of the world frowarded for the foreseeable future whether we like it of not. However, the impac of green house effect, the limit supply of fossil fuesl, it is wise to work towards energy saving, emission reduction, energy recovery, and exploration of new renewable energy sources. Currently, the electricity generation technology using piezoelectric material to recover the compressional or vibrational energy begins to attract attention, in particular, in areas of designing small self-powered devices. This paper presents an overview of the feasibility of piezoelectric power generation for electric power system, in which the fundamentals of piezoelectric power generation and the feasible structure of the system are discussed.

Considering the poor generalization ability of the subject-specific Mental Workload (MWL) classifier, a cross-subject MWL recognition framework was proposed in this paper. In the proposed framework, Kernel Spectral Regression (KSR) and Transferable Discriminative Dimensionality Reduction (TDDR) methods were employed to reduce the feature dimensionality and transfer the classification knowledge from the source domain to the target one. The data analysis results showed that the proposed framework and the related methods can effectively improve the accuracy of MWL recognition.

The reliability of the power grid would change when the wind-storage system connects to the power grid. In the meantime, the economy for the wind farm would also be changed. This paper proposes a new objective function to optimize the wind farm’s storage capacity. The objective function built on the reliability and economy for the wind farm. The paper demonstrated a test system named IEEE RTS79 to detect the new objective function’s practicability.

The cryogenic control system for the Experimental Advanced Superconductive Tokamak (EAST) was designed and constructed based on DeltaV distributed control system from Emerson Corporation, which has been operated for eleven cryogenic experimental campaigns since its first commissioning in 2005 and demonstrated stable and reliable over these years. With the reconstruction of EAST cryogenic system, its control system has also been extended and upgraded to ensure its reliability and availability in continuously uninterrupted operation. In the meantime, for breaking the limitation of commercial control software, the cryogenic control system is being redesigned based on the open source distributed control software architecture EPICS. This paper will introduce the present status of EAST cryogenic instrumentation and control system. Also, the reconstruction plan based on EPICS will be presented in detail.

UHV single-phase grounding fault presents unique physical features under the action of hybrid reactive compensation with the combination of the series compensation and the stepped controlled high resistance. The influence mechanism is more complex than the conventional UHV transmission line. Basing on the introduction of the key elements and structure of the hybrid reactive compensation, this paper studies the arc ignition and self extinguishing characteristics of secondary arc. Firstly, the works undertaken both at home and abroad were presetned, before, the unique physical features of secondary arc selfextinguishing with the UHV hybrid reactive compensation were put forwarded. With regard to single-phase autoreclosure and secondary arc self-extinguishing, our investigation have uncovered the key problems of UHV power grid with hybrid reactive compensation, by which might pave the way for future application.

To solve the multi-variable, non-linear, and non-convex reactive power optimization problem, this study proposes a new intelligent optimization algorithm called Cell Membrane Optimization (CMO). This algorithm is based on the diffusion processes of the substance in cell. The substance (solutions) moves through free diffusion, facilitated diffusion and active transport according to its type which is classified by concentration, thereby increasing the speed of searching for the global optimal solution. In the process of reactive power optimization, based on the constraint conditions establish objective function of the minimum net loss using CMO. The algorithm is tested with IEEE 14-bus and IEEE 30-bus systems. Results show that the optimization ability of the algorithm is acceptable. This algorithm has parallelism naturally, which can avoid the local optimal solution.

With the extension of Ultrahigh Voltage (UHV) transmission line, hybrid reactive compensation will be widely used in the future. On the basis of the introduction of key components and the structure of hybrid reactive compensation, simulation analysis was carried out on the characteristics of circuit breaker when out-of-phase fault occurs in the UHV transmission line with hybrid reactive compensation. With regard to the worst condition of the out-of-phase fault, the variation rules of the out-of-phase fault transient recovery voltage of circuit breakers were obtained. Using equivalent lumped parameter circuit, the computational formula of the out-of-phase fault transient recovery voltage rising rate are deduced and computed. Based on the above method, the variation rules of the out-of-phase fault transient recovery voltage in UHV transmission line were studied under the condition with hybrid reactive compensation. In view of the out-of-phase fault interruption characteristics, the research results provided analysis foundation and theoretical basis for parameter optimization of the hybrid reactive compensation and arrangement selection of circuit breaker in UHV transmission line.

The application of APF in power transformer is analyzed. At the same time, the harmonic detect methods of instantaneous reactive power theory have some disadvantages. A novel detect method based on the average value is proposed, which can reduce the detecting delay and calculation time, so that the harmonic can be real-time and dynamic compensated. The correctness of arithmetic and the feasibility of converter design are verified by simulation results and experiments.

There are some disadvantages in mechanism tap-changers, and this paper proposes a new 10KV no-contact tap-changer on-load voltage regulator. The compensated principle is used to regulate output voltage and the switch process is completed by SCR, so the dynamic response is fast and the harmonic is little. In addition, the electric arc is not produced. At the same time, the advanced combination technology and optimum topology are adopted. The compensated voltage precision is high and have more grades. The relationship between compensated voltage and switch stage is also given. Based on the principle and topology, the power flow is analyzed and introduced to reveal the inner running essence. The correctness of power flow analysis and the feasibility of circuit design are verified by experiment results.

The deformation failure and mechanical vibration is closely related to power transformer windings. The problem of a transformer is poor accuracy in the diagnosis of mechanical deformation and difficult to accurately judge the winding fault type. In this paper, as the research object of the S11-M-500/35 type distribution transformer, to obtain the vibration information through the obstructing of transformer winding insulation, low voltage winding compression and loose winding deformation failure. Two signal processing methods, wavelet packet energy spectrum entropy and the short-time Fourier transform are adopted respectively to extract the feature of different deformation information. Using the method of fuzzy c-means clustering analysis to compare the classification of the two methods of feature extraction to determine the one with more effectiveness. The results demonstrate that the wavelet packet energy spectrum entropy feature extraction method can achieve the best classification results for the winding failure deformation type. Its membership degree is above 0.94, providing the basis for the later mechanical failure diagnosis of winding type.

Hot washing has been applied with more and more frequency on power systems and splashing water has a great influence on hot washing cleaning effect, but the corresponding research was rare. Simulation analysis and theoretical research were carried out to analyze the influence of splashing water on insulator hot washing cleaning effect. The results demonstrated that splashing water will increase the cleaning range and improve the cleaning efficiency, but may also cause flashover occurrence, affecting the security of hot washing; leading to the change of cleaning mechanism. The main reason of cleaning had changed from internal water pressure to directly shear pressure. It also can improve the adhesion force as it caused high relative humidity around the contamination, but having little influence on dynamic pressure.

With the continuous development of distributed power and micro grid, distribution network structure becomes increasingly complex. Being able to estimate vulnerability of the distribution network becomes an important part in modern society. A simple margin analysis could not clearly reveal inherited characteristics of the power system, so complex network theory begins to be applied to analyze structural vulnerability of power systems. Therefore, from the basic concept of complex networks departure, it defines the electrical characterization of the nature of the distribution network topology improved correlation matrix. Taking into account the evolving smart grid, distribution network and the internet gradually reflect a great similarity. In this paper, the worm simulation model determines the vulnerability of the distribution network nodes, combined with improved incidence matrix squaring algorithm to get the distribution network node vulnerability. It provides a theoretical basis for the future with vulnerability research in grid.

With wind power and other renewable energy access to power grid, its influence on the reliability of power network is a concern. As a new type of vehicle, electric vehicles are becoming more popular. Firstly, this paper establishes the model of electric vehicle charging load and the output of wind power. Then the impact of EVs and wind power on system reliability are analyzed by sequential Monte Carlo approach in the RTS79 system. Finally, the load carrying capacity of wind system for EVs is calculated, in order to research the relationship between wind power and EV load under a certain reliability index.

This paper proposes a bottom-up, probabilistic harmonic assessment technique for residential loads. The modeling, divided into two levels, uses the Markov-Chain Monte Carlo (MCMC) method to build harmonic profiles of 24h. At the top, Monte Carlo controls the household size, the ownership of electric devices and other factors that result in different use patterns of home appliances between families. At the bottom, Markov-Chain is used to determine the starting time of each appliance in individual household. A varying harmonic equivalent circuit based on human behavior representing a residential house, combining user activity model with corresponding electric harmonic model, is thus derived. The total harmonic produced by residential loads is carried out by accumulating multiple residential houses supplied with residential feeders. Field measurements have confirmed the validity of the proposed technique.

It is very important in multi-station and time-sharing measurement method. Through computer simulations and experiments, in the paper, the layout constraint of laser tracker is studied by analyzing the Jacobian matrix of equations to verifies the layout constraint to improve the measurement accuracy.

There are a lot of converters in the DC microgrid. This tightly regulated closed-loop converters may cause stability problem of bus voltage when used as a load since constant power is drawn. In this paper, a novel passive damping method was introduced to enhance the stability of the DC microgrid. This method adds the passive damper to the DC bus, which enlarges the system’s damping and insures the stability of DC microgrid. The feasibility and effectiveness of this method are verified by the simulation results.

For the purpose of national security and defense, it is of great importance to detect and locate spacecraft invaded into our country airspace. A satellite with ADS-B receivers can realize universal air traffic surveillance services by providing global ADS-B coverage to oceans, the poles and remote areas. But the ADS-B system cannot work properly if the GNSS fails or the data have been tampered before transmission. On the other hand, the data transmitted by non ICAO targets will be encrypted. In this paper, we put forwarded a passive location of anomaly target based on space-borne ADS-B signal, which includes positioning with single satellite; twin satellites, and the one with formation flying and the one with satellites constellation. In particular, the basic concepts, characteristics, critical technologies and the performance for these applications are discussed, before finally proposed a space-borne ASD-B, which adopted from the modification of above methods.

In this paper, an autonomous calibration method for sensor of navigation satellite is presented. Based on the requirement of pointing to earth, the sensors are calibrated by use of the ephemeris, and a calibration scheme designed to prevent random noise influence. The on-orbit data verification indicates the availability and feasibility of the method, and it is easy to realize in onboard software.

As the fourth fundamental circuit element, Memristor has been achieving lots of attention since its realization. This paper presents the analysis of memcapacitive and meminductive circuit and investigate the response of the circuit to periodic and aperiodic input voltage signals. The simulation results show that the periodic input would change the memcapacitance sharply while the aperiodic input will not change the state of the memcapacitor. Similar results have been observed in meminductive circuit and we have also analysed this phenomenon.

Currently, the methods of calculation limiting capacity of transmission line are lack of economy and security. In this paper, based on the theory of the power circles and the conservative utility function, the proposed model can calculate limiting transmission capacity and meeting the security status of running transmission lines. Furthermore, on the condition that transmission lines meet economic and security policy, this paper utilizes the fault probability model that was improved by the conservative utility function to calculate limiting transmission capacity. Through analyzing the result of a calculation example, the paper can improve transmission capacity of existing transmission lines, and has great significance for promoting the future of grid transmission capacity.

Interaction between inverter stations is the facing challenge in multi-infeed direct current (MIDC) transmission system. Unified power flow controller (UPFC) is a new generation equipment and using UPFC to solve the facing problem in MIDC system is a new idea. UPFC is the combination of static synchronous compensation (STATCOM) and static synchronous series compensator (SSSC). SSSC is equivalent to impedance connected in series in line. This paper reviewed the achievement of STATCOM in MIDC system and analyzed the relationship between multi-infeed interaction factor (MIIF) and series impedance. The result shows that it’s effective to reduce interaction by changing series equivalent impedance. Considering the effect of STATCOM, it's feasible to reduce MIIF index and enhance MIDC system performance through UPFC.

The actual CT model is established under the Saber software by using the MCT (Magnetic Component Tool) in this paper. The research demonstrates that the output power of CT first increases and then decreases with the increase of the filter capacitor voltage. The output power has a maximum point and the maximum power is independent on the turn number when the voltage drop of the rectifier is ignored. But when considering the voltage drop of the rectifier, the maximum power increases with the increase of turn number, and becomes saturated in the end. This has important significance for the selection of turn number. In the output power characteristic curve, there are two operating points corresponding to the load power consumption and the point with higher voltage is the stable operating point. In order to characterize the stability margin, the half power width is defined. Taking the minimum output 0.5W as an example, the turn number is selected by simulation and the hardware circuit is designed. The correctness of the analysis is verified by experiments.

There are many tremendous risks of the secure and reliable operation of the power distribution network due to the fault, resonance oscillation, operation and lightning overvoltage in the power grid. The present measurement methods about over-voltage are based on the voltage transformer installed in the substation or its improved equipment and need complex data if just for over-voltage warning. This paper researches to use mechanism of production about corona to offer a simple method which can measure over-voltage qualitatively as a supplement of the over-voltage measurements. Experimental results show that, the needle plate electrode structure can be used as a supplemental measure about over-voltage measurement and warning of distribution network which is simple and practicable. In addition, in the normal operating voltage range the needle plate electrode structure can detect voltage waveform as non-contact voltage transformer to some extent. Capacitance of the needle plate electrode structure is tiny, so, it can detect transient voltage of charged conductor effectively.

The conventional method of clearing the DC pole-to-pole short circuit fault of the halfbridge sub-module based Modular Multilevel Converter (H-MMC) is to trip the ac circuit breakers, which takes a long time to restart the system. The H-MMC with arm damper can help the fault current decay quickly, and realize fast system recovery. In this paper, an analytical model is proposed to analyze the DC pole-to-pole short circuit fault behavior in MMC based high voltage direct current (MMC-HVDC) transmission systems with arm damper. The fault mechanism is analyzed in detail including three stages: before blocking the converter, after blocking the converter, and after tripping the ac circuit breakers, and the derived analytical equations are given at each stage. Using the analytical model, the fault current can be accurately and quickly predicted. Finally, the proposed analytical model is verified by Matlab/Simulink, and the calculated results agree well with the simulation results.

Assembly planning generally required generating the detailed plans of each of steps in the entired work flow sequence, in terms of solutions. However, with the complexity of the program become more complex, and the number of plans for every conisitional parts will needed to expand and grow in the solution space, so much so that algorithms to understand the process, and generate the sequence of the workflow have becoming essential in order to avoid combination explosion. In order to effectively reduce the number of parts in the product sequence planning, the product assembly hierarchy model is established, and the interference matrix and connection matrix are analyzed, based on assembly mating features to identify sub assembly, the assembly sequence of the product can be automatically generated efficiently.

To solve the engineering application problems currently exist in radar astronomic calibration and implement the regularly calibration of ship-borne radar while in maritime dynamic condition, through analysis to equipment principles and error model. The calculation method of error equation based on SVD is proposed by trial and error, and a set of typical data from the test results is provided. The test indicates that this calibration method can separate 8 individual errors invalidly, whose precision is better than normal calibration method. By means of SVD, the least square solution of individual error in radar equipment can be obtained. The problem of data rationality, data repeat-ability and data stability in original astronomic calibration has been solved successfully.

To study the flow field in saddle zone of a tubular pumping station, the three dimensional unsteady turbulent flow was numerically simulated with CFD software under different operational conditions. Some characteristics of flow field in saddle zone were obtained, and the results show that there is good agreement between experiment and simulation data and both of them illustrate the flow features of saddle zone under flow of 0.45Q_DES to 0.75Q_DES. With the decreasing of flow rate, the flow becomes more turbulent, and more vortex and backflow can be found with strong energy consumption, which is the main reason of saddle zone. Besides, the pressure fluctuation intensity with no obvious regularity of impeller inlet in saddle is much stronger than that of impeller inlet under designed flow rate.

A three parameter kinetic cracking model has been established using the concept of special pseudo-components and has been used successfully to predict the operational behavior of fluidized catalytic cracking (FCC) risers. Compared with the six parameter kinetic model previously proposed by the authors, the cracking model of this paper is much simplified in calculation and enjoys improved identifiability. Tests with the production data of three commercial risers show that the proposed model has the capability of predicting a riser and catalyst, the kinetic parameters are independent of stock oils.

With the development of Internet of Things industry, network security has become more and more important. The intelligent node in the building equipment Internet of Things realizes the Ethernet communication protocol and wireless network communication protocol. This paper is concerned with the problem of data security between the intelligent node and the server. The study shows that, among different data encryption algorithms, DES encryption algorithm is suitable for encrypting data by embedded system. Firstly, the paper introduces the function of intelligent node and its hardware environment. Then, the data encryption software design is presented. Lastly, DES encryption programs and the encryption effect are tested in Internet of things intelligent node application. The test results show that the algorithm can be implemented stably in Internet of things intelligent node hardware platform. The encryption and decryption efficiency is better than the general algorithm. DES encryption algorithm improves security of the Internet of things intelligent node in network communication.

In this paper, a phytoplankton-zooplankton system with state feedback control strategies is proposed and analyzed. Firstly, the dynamic behaviour of the system including the existence and stability of equilibria are investigated, the global asymptotical stability of equilibria is analyzed by Lyapunov method. And then, the existence and stability of the semi-trivial periodic solution and order-1 periodic solution for P_r≤P_C and P_r>P_C are discussed. The analytical results provide a possibility of obtain a stable output in a phytoplankton-zooplankton system.

This paper describes a piecewise linear control allocation method based on Computational Fluid Dynamics (CFD) aero-data for a blended wing body (BWB) aircraft with redundant control surfaces. The conventional control allocation methods usually assume that linear efficiency existence between the control surfaces deflection and the virtual control torque. But from the calculated CFD aero-data of the BWB aircraft, the characteristic of the elevons and split rudders to the control torque is nonlinear, which may bring control errors by using conventional linear methods. The piecewise linear approximate method is used to estimate the nonlinear control efficiency of surface deflection. In order to obtain the surface commands, a piecewise linear programing control allocation (PLPCA) scheme is applied by considering the constraints of the deflection position and rate. The simulation result shows that the PLPCA scheme can allocate the control surfaces reasonably and generate better virtual moment command than that of the linear programing control allocation (LPCA).

This paper describes a data fusion algorithm used to estimate parameter for fast time-varying motion. A method of noise variance estimation based on the characteristics of wavelet vanishing moments is analyzed, compared with the arithmetic average method, which is verified by the simulation data. The results show that the correctness and validity of the fusion algorithm.

This paper discusses the designing and realizing of the simulation system of UMC and FBW in an avionics integrated simulation system, primarily investigating system design and management, software development and bus information stream management. The system adopts the bus topological structure of a certain aircraft, connecting the various subsystems for the purpose of avionics integration. Under the conditions established by the ICD, this system realizes communication between the various subsystems with the use of MIL-STD-1553B Bus Data and ethernet as the transmission medium.

Aiming at the typical structure of military aircraft avionics systems, this paper presents a design of the airborne embedded training system. In this paper, the design requirements of embedded training system are discussed, which lay the groundwork for the improvement of the airborne embedded training system design plan. The overall architecture of airborne embedded training system is designed in details. The Arena simulation software is used to simulate the integration process between airborne embedded training system and other avionics systems. The evaluation of quota system of training is formulated. VC++6.0 is used to make simulation for performance evaluation process.

In order to investigate the mechanism of variation in pulse wave during the pulse diagnosis in cunkou area, a one-dimensional model of left upper extremity is created to simulate the pulse wave under different conditions of finger distribution during pulse taking. The results show that the reflected wave caused by variation in lumen area would increase the pressure in proximal region while decline the pressure in the distal region. With the increasing force, the reflected wave makes the waveforms in three regions; with each associated with different organs in our body. Simulation results had confirmed that the pressure waveform is similar to the lumen cross-section area curves. When the blood flow is basically blocked, findings show that the sharp changes in the blood flow rate that determines the level of blood pressure, and the area curves at blocking site present a negative wave. Meanwhile, the ascending branch of the pulse wave in the distal region spends more time and the curve gets smoother, which had been called pulse-taking piezoresistive effect. This paper promotes clearing the similarities and differences between pulse wave in three regions and the engineering analysis research about traditional Chinese medicine.

In the current paper, the quasi-zero stiffness effect caused by the pseudo elastic effect of Shape Memory Alloy (SMA) spring in vibration isolator is modeled and analyzed. The recovery force of the SMA spring is modeled as a non-convex one. A macroscopic differential model is employed to describe the hysteretic dynamics and pseudo elasticity of the SMA spring. It is illustrated that the resonant frequency of the proposed isolation system is close to zero. Numerical simulations are presented in studying the influence of the excitation frequencies on vibration isolation performance. It shows that a quasi-zero dynamic stiffness is achieved; the feasibility of the proposed system for ultra-low frequency excitation isolation is validated.

In this paper, a class of nonlinear weakly singular integral inequality is investigated, which includes a non-constant term outside the integrals. The upper bounds of the embedded unknown functions are estimated explicitly by adopting novel analysis techniques, such as: the definitions and rules of conformable fractional differential and conformable fractional integration, the techniques of change of variable, and the method of amplification. The derived results can be applied in the study of qualitative properties of solutions of conformable fractional integral equations.

In this article, a new type of spherical cap piezoelectric composite oscillator was designed. For the preparation of piezoelectric oscillator, a new process of cutting spherical piezoelectric ceramic-casting polymer was proposed. The modeling and simulation of piezoelectric oscillator were presented by using ANSYS 10.0, the resonant frequency and the admittance curve of the piezoelectric oscillator in the air were derived. The piezoelectric composite oscillator was prepared with the guide of simulation result. The result of the performance test of piezoelectric oscillator has shown that the resonant frequency of the piezoelectric oscillator in the air was 325.60kHz and the bandwidth can reach 14.17kHz. Comparing the measurement results and simulation, the relative error of resonant frequency is less than 1% and the test result turns out that the spherical piezoelectric composite oscillator is suitable for manufacturing broadband transducer.

Based on the strain measurement requirements of plastic materials in high-speed tensile environment, considering the difficulty of signature change in shape and the features extraction caused by the small contrast between mark features and background, a novel edge detection technique is proposed, which combines the advantages of Hough transform and canny algorithm. The designed technique can realize the feature extraction with high precision and efficiency, and meet the requirement of strain measurement in high-speed tensile test.

The paper designed two ways to search the critical point in the press-fit curve. The first one starts from the source data. The cubic spline interpolation method is used to deal with data, then the first derivative and second derivative are solved in turn. Finally, the maximum value of second derivative is derived, and it is the critical point. For the second way, the press-fit curve is treated as an image. Then, the Harris corner detection algorithm is applied with the image, and search the point, which has the maximum change in grayscale. Finally, the algorithm is tested in the laboratory with limited data. The algorithm is found to be useful and it can be tested with more data from factory.

Simulation has been a powerful planning, strategic and visualization tool in many fields. A simulation method for multi domain physical system in MATLAB/Simscape is proposed in this paper, and the inverse kinematical simulation model of the rehabilitation training equipment is established. Multiple motional trajectories of the end effector are obtained and a detailed analysis is made on one set of the motion trajectories. The simulation results show that the rehabilitation training equipment can ensure the smooth operation of the end effector and the feasibility and reasonableness of the trajectory. Simscape, for analysis, including parametric studies and optimization, and the results can then be used to validate and make improvements to the design.

Maximum Power Point Tracking (MPPT) methods play an important role in Photovoltaic (PV) system. They maximize the output power of a PV array for a given set of conditions. Incremental Conductance (INC) MPPT is one of the most popular detection methods because of its simple implementation and high accuracy. In this paper, a new improved INC method is proposed based on the PV output power and it is suitable for practical operating conditions due to a wider operating range of irradiation changes. Simulation results confirm that the proposed algorithm reduces voltage fluctuation in comparison with conventional fixed step size INC algorithm.

In this paper, reliability assessment of sealing ring in hydraulic systems is carried out based on the Back Propagation (BP) neural networks. An O-ring Finite Element Model (FEM) is established based on ANSYS software, by which the calculated maximum contact stress is taken as failure criteria. The diameter, oil pressure, the amount of compression, and modulus of elasticity are treated as random variables to take into account the parameters variations for studying the effect of parameter uncertainty on the sealing performance. Simulation data that generated from the FEM model is trained by using the artificial neural network toolbox to fit the relationship between the input data and output response. The trained neural network model is finally combined with the importance sampling method, to study the effect of the parameter variations on the reliability of the seal.

With regard to wellbore structure near subsea wellhead, differential equation was established to describe the testing string deformation just above the wellhead. Effects of key parameters, such as axial force and riser flexible joint deflection, on local testing string mechanical behavior were investigated. Taking maximum bending stress and tubing-flexible joint contact as criterions, confines of key factors were expressed though a safe range chart to prevent tubing failure. According to calculation, tubing string has two potential risks: stress yielding at fixed end and collapsing from contact with flexible joint. The angular deflection of flexible joint is the dominating parameter over tubing string safety. Optimal distance from flexible joint to subsea testing tree was proposed, and strategy for promoting string safety was recommended.

In order to reduce the purchase and maintenance cost of the subway vehicle axle box bearings and shorten the maintenance period, the localized vehicle axle box bearings applied to a line of Beijing subway were prepared. The main design technical parameters, life calculation, life test, performance test and the post-installation main track testing of the manufactured localized axle box bearings are induced in this paper. Results of all the tests show that the localized axle box bearings can satisfy the vehicle running requirements in a line of Beijing subway.

Tracking imaging attitude control of video satellite for uncooperative moving object is studied in the paper. The effect of satellite attitude adjustment during tracking imaging on image is analyzed quantitatively, and based on it tracking imaging feedback control strategy considering the delay of actuator is proposed in the case of having detected the object in video image. The control law for the reaction wheels is designed, whose asymptotic stability is proved using Lyapunov stability theory. Numerical simulation results show that the presented approach is effective for video satellite achieving tracking imaging of uncooperative moving object.

In this paper, the attitude control problem of the video satellite on the ground multi-object staring imaging is studied. On condition that the expected yaw angle is always zero, the expected attitude and angular velocity of the video satellite are solved. The mathematical model of attitude tracking is established based on quaternion and angular velocity. The asymptotic stability of the control model is also proved by the Lyapunov function. Then a variable coefficient PD adaptive controller is designed based on genetic algorithm. The simulation results show that under the condition of disturbances and errors, this method can realize the staring imaging of ground object with zero yaw angle. For the task of ground multi-object staring imaging, the control time can be greatly reduced under the premise of accuracy requirement by using this control method, which will improve the efficiency of the satellite to star imaging significantly.

Vibration test is a scientific method to measure anti-vibration performance of product. All current vibration test standards are based on three kinds of vibration test tables as crank rotary type, electromagnetic type and electro hydraulic type. Because of the different flaws of these kinds of vibration tables, the extension of vibration test in professional field is restricted. In this paper, a new vibration test method is proposed. The vibration table for the new method is composed of several excitation units, which are based on existing crank rotary test table. The compound frequency vibration is synthesized with displacement vectors of multiple excitation units by levers. The new method has both a clear output as crank rotary type and a frequency range following the real distribution as electromagnetic type and electro hydraulic type. With further research on related standard test method, the new method proposed will be a trend in professional field. The new method we proposed makes a foundation for the conclusion of vibration test from qualitative to quantitative. It will also help to promote the concept of proper packaging and green packaging.

Based on the key technology of subsurface safety valve testing, the control system processing real-time signal sampling automatically with high precision is proposed. Furthermore, a stable and accurate signal conditioning circuit is proposed to process the sampling signal. The main part of the system is control software with function of high-speed data acquisition, real-time display and automatic memory, which are based on virtual instrument software platform.

A new subsurface safety valve test system, including hydraulic test unit, liquid test unit, gas test unit and control unit is proposed in this paper. The control unit is realized by using virtual instruments and PCI cards. The test system can provide hydraulic oil to power the safety valve, as well as high-pressure liquid and gas to simulate the working environment. For power source, low pressure gas is pressurized by a booster pump to supply three units, thus making the system more compact with lower cost.

In Cutterhead Driving System (CDS) of Tunnel Boring Machine (TBM), failure of key component often occurs owning to the severe vibration. To investigate the dynamic characteristics, a scale CDS test-bench is designed based on similarity theory, which can control the load torque precisely and obtain dynamic response of CDS. Based on virtual shaft equivalent method, a fully coupled dynamic model of test-bench is established, which includes multi-stage gear transmission system and cutterhead. By taking account of the nonlinear factors of gear meshing and external excitation, dynamic responses of CDS test-bench are obtained, which mainly vibrate near mesh frequency and the frequencies of load torque. The external excitation and dynamic responses analyzed in this paper provide guideline in actual testing process.

A full-body recognition method of human motions is proposed in this paper. It allows human to control the humanoid robot to imitate his motions with full-body language. In proposed Human-Robot Interaction system (HRI), real human manipulation motions are acquired by Microsoft’s Kinect sensor. To improve the efficiency of the motion recognition, the particle filter algorithm is proposed. In terms of the challenge for a humanoid robot to imitate full-body human motions, two different strategies are used in upper body and lower body respectively. The upper-body system includes a series of angle calculations while a Finite-State Machine (FSM) is introduced in lower-body recognition process. The corresponding simulations and experiments are implemented with both software and a self-made humanoid robot. The results indicate the proposed method is stable and efficient.

Managing data and knowledge sharing in scientific environment is a great challenge, especially in today’s big data environment. Traditional monolithic Business Intelligence (BI) systems are difficult to scale up to the massive data sets distributed across a large number of sites. Targeting this challenge, the data mining research has to overcome two major obstacles; mmimg in a distributed environment, and mining on the fly in order to pursue knowledge discovery. Unfortunately, due to highly domain dependency and monolithic deployment, the integration of such large-scale mining on big data is proof to be a tall order. In this paper, we propose a flexible mining system with multi-tier architecture to alleviate these challenges. The system meets the diverse needs of scientific data mining and knowledge sharing. Each service represents the result of an orchestration of reusable building blocks as well as predefined tasks. Its main advantage is that it can deliver BI process as Software-as-a-Service and supports adaptive data mining processes.

The global population aging is increasingly serious and patients with lower-limb dysfunction caused by various diseases, injuries and traffic accidents have increased significantly. Motion control of lower limbs rehabilitation robot plays an important role. This paper deals with the tracking control of an omnidirectional lower limbs rehabilitation robot. The main research contents of this paper consist of two parts: 1) the kinematic and dynamic model is integrated within the control framework. 2) A PD control scheme is used to achieve the desired trajectories. Simulation tests are performed and demonstrate the feasibility and efficacy of the proposed method.

For the path planning application of the basic ant colony algorithm, it is easy to fall into the local optimal solution. And the long searching time is also a problem. In order to solve these problems, this paper presents a modified ant colony algorithm. At the beginning, in order to make the ants broaden the search and avoid falling into local optimum, a piecewise function using the state transition probabilities and the priority to balance the pheromone of all paths is introduced. And after searching a certain region, in order to speed up the convergence, an acceleration function is used. The simulation results show that the algorithm can quickly find the optimal path in the model grid map.

For optimization of preventive periodic maintenance cycle of complex system, two patterns are developed for the preventive periodic maintenance of complex equipment system. With the purpose of minimizing the safety, task and economic risks of system, a decision-making model is built for the preventive periodic maintenance cycle of complex equipment system. As decision-making model is based on the calculation of the optimal equilibrium solution in Pareto optimal solution set. For the reliability of the system to be used in solving the decision-making model, GO method is combined with Extend model to simulate the reliability of complex equipment system. The determined preventive periodic maintenance cycle of complex equipment system can lower the safety and task risks of system to the maximum, while considerably reducing the maintenance cost, so it plays an important part in the decision-making of maintenance.

A fuzzy-PID control strategy based on T-S fuzzy model is proposed by combining fuzzy control and Conventional PID control. PID controller is developed for each subsystem of T-S fuzzy model. In terms of fuzzy-control theory, each subsystem’s control law and membership function can be used to synthetically calculate the whole control system’s control law, which control the whole system. The fuzzy-PID control strategy is also applied to three-tank water level nonlinear system. The control results show the effectiveness and feasibility of the proposed method.

In the industry process, the delayed time is possible to change, and the uncertainty of delayed time can sharply increase the difficulty of the control. Based on Time-Delay Dependent State Feedback Predictive Control (DDSFPC) algorithm and Lyapunov functional method, this thesis deals with the system with uncertain state time-delay. The delayed time is led into the matrix, a sufficient condition for the range of the uncertain delayed time is provided via LMI. It also provides the range of the delayed time, which can make sure of the stability of the system. The validity of the above condition is proved by representative example.

In this paper, a novel-filtering algorithm for the relative orbit determination of non-cooperative maneuvering target is proposed. The algorithm is based on the Strong Tracking Filter (STF) and the Square-root Cubature Kalman Filter (SCKF), called Robust Square-root Cubature Kalman Filter (RSCKF). With the nonlinear orbital dynamics equation as the state model, radar located on the chaser spacecraft as the measurement equipment, the RSCKF is applied for the relative orbit estimation. Simulation results show the superiority of RSCKF over SCKF.

As to product family customization planning, enterprises not only need to determine the performance locations of the customized products, but also face the market price game between the customized products. Considering the consumers’ preference for high quality products, firstly, the planning game model is built. Secondly, based on the models (simulation) calculation and analysis, price equilibrium and performance location equilibrium can be gained in turn by backward induction method. At last, it is proved that the quality factor can drive the equilibrium location to the high end, and then through the price game, companies are impelled to produce the higher quality customized products. Game analysis will help enterprises employ the appropriate strategies of product family customization planning.

All the singular or velocity-degenerate configurations of a novel 9-DOF (Degree of Freedom) robotic arm are presented in this paper. The 9-DOF robotic arm consists of four uniform decentered joints and a single joint. A reciprocity-based methodology for finding the 1-DOF loss singular configurations of joint-redundant robotic arm is used for the 9-DOF robotic arm. Fifteen conditions of singular configurations are listed.

With the development of maritime trade, more and more people draw attention to the safety of maritime transportation. Anomaly detection of vessels is important for maritime safety. Most vessels are equipped with Automatic Identification System (AIS), which provides the kinetic information of vessels. It is possible to detect anomaly by mining the massive AIS data with various machine-learning algorithms. In this paper, the background and the conceptual model of anomaly detection are introduced. Then, the machine learning algorithms that are used for vessel motion analysis and anomaly detection are reviewed. Meanwhile, the features and problems of each approach are discussed. At last, the future research direction of maritime anomaly detection is summarized and discussed.

The desktop grade manipulator refers to the manipulator with smaller volume, lower cost and multi-function relative to the industrial manipulator, used in smart home and office. It can help users with daily work like taking and moving objects, etc. Currently, the desktop grade manipulator can only be controlled directly by program or manual and not based on the data from environmental awareness and target recognition, through the way of autonomous learning to control actions and services for the user. The industrial manipulator control system, while the precision is high, but its ability to adapt to the different environment and the autonomous learning ability is insufficient. This article aims at the environmental awareness and target recognition problem in the desktop grade manipulator control field, designs and implements environment perception and 3D modeling algorithm based on distance sensor. It is also by 3D modeling design on the target search algorithm based on camera and distance sensor. Finally, using the search results to improve the target recognition algorithm based on machine learning. This paper uses low cost open source software and hardware in making the prototype system. It realizes the surrounding environment perception and automatic search to identify and pick the unknown location object.

In this paper, the problem of blind source separation in the over determined mixtures case is considered. A two-step-type blind source separation method is proposed, which first identifies the mixing matrix and then performs source estimation with the identified mixing matrix. In the step of identifying the mixing matrix, a new blind identification algorithm, which is based on the canonical decomposition of a higher order tensor, is proposed. Gradient descent approach and generalized eigenvalue decomposition technique are used to perform the canonical decomposition. By using the identification detecting device, blind identification is reformulated as a constrained optimization problem. Unlike the traditional blind identification based on simultaneous matrix diagonalization, the proposed algorithm identifies the columns of the mixing matrix in a sequential fashion. Simulation results demonstrate that the proposed algorithm can achieve good performance.

The steady strain rate, velocity, strain and stress fields in the first deformation zone of orthogonal cutting are established based on the J-C constitutive equation and cutting models of Tounsi and Oxley, while the steady temperature field in the first zone is described using the temperature field model of Komanduri. Utilizing the interdependent relationship between the force and temperature, the predicted value of cutting force can be gained by calculating circularly and controlling convergence errors. Finally, comparing with the experimental results, it is found that the model is applicable to high speed and little cutting thickness conditions, and the shear zone thickness is approximately half of the cutting thickness and decreases with the increment of cutting speed.

Traditional location technology research on nuclear explosion infrasound detection is based on plane geometry. Taking into account the earth’s sphere and ellipsoid characteristics, the traditional method inevitably exists the disadvantages such as low location accuracy, strong disturbance and limited location distance. Under the prerequisite that earth is a sphere, this paper focuses on the calculation of the distance between the infrasound source and the measurement array using spherical geometry theorem, and solves the infrasound source location (latitude and longitude) problem with the known relative azimuth and distance. Simulation comparison results show that, compared with the traditional method, the proposed infrasound detection and location method based on the spherical geometry has advantages in location accuracy and range.

A new method of Fluid Catalytic Cracking (FCC) products expression based on special pseudo-components (SPCs) is proposed in this article. The Maximum Information Entropy Method (MIEM) combined with Gaussian distribution is taken into account to solve the problem of the overlaps among components when describing products in previous FCC models based on SPCs. The successful application on the commercial FCC model constructed by Zhang et al. proves the validity of the new method.

In this research, two diffuser types of volute were designed, the volute with tangential diffuser and the volute with radial diffuser. Normally, different diffuser types of volute will affect the performance of pump, while in this paper, little effect can be found. Two diffuser types of volute were designed to study the effect on pressure fluctuation features of centrifugal pump under part-load condition, with the same volute design parameters and impeller parameters. The unsteady, three dimensional turbulent flow in the pump was simulated. It shows that the periodic features in pressure fluctuation near its tongue are the same for two diffuser types of volute, however in the diffuser of the volute, the values of the pressure fluctuation in radial diffuser is greater than that in tangential diffuser. The results can provide a useful reference for designing the diffuser of volute in centrifugal pump.

China Spallation Neutron Source (CSNS) AC dipole magnet is the largest AC vibration magnet in China. The magnet is composed of an upper and a lower half iron core combined, which is an H type magnet. Two excitation coils are respectively arranged in the grooves of the upper and the lower iron cores, and are fixed by eight supports. When the ceramic vacuum box is installed, the two iron cores are required to be opened, after the vacuum box is installed, the iron core is needed to be assembled again, but due to the limited air gap of the magnet, the eight coil supports cannot be adjusted at this time. In the assembly, to ensure the coil is pushed tightly, this paper, through ANSYS analysis and experimental method to analyze the force deformation of the epoxy coil and support. Firstly, it sets the interference fit of the coil and the support, and then the upper half magnet coil directly presses on the coil support, through the coil and the support interference fit to fix coils, completing the assembly magnet and vacuum box.

CSNS-RCS magnet girder is used for supporting, adjusting and locating magnet. The precision of the adjustment will influence the magnet collimation precision. In order to optimize on manpower and time, the magnet girder electromotion adjustment device must be designed with capability to adjust girder to change the operation to electromotion. Using a mitsubishi FX system, PLC and Wein View touch screen host computer, the electromotion adjustment was designed. This system made all of the magnets in RCS be adjusted, which used with laser tracker.

A set of 3 Multi-wire Profile Monitors (MWPMs) has been installed in the injection line of Chinese Spallation Neutron Source (CSNS). In the early stage of commissioning, for establishing an optimum injection orbit, MWPMs are the most important beam monitors to measure positions and profile distribution of injection beam from LINAC. This paper demonstrates the mechanical design of MWPMs for CSNS injection. According to the physical parameters, the wire-distribution structure consist of several horizontal and vertical wires with a 30° angle is fabricated and choose the optimal wire by thermal analysis and mechanical analysis with the finite element software ANSYS. Furthermore, the most appropriate wire-clamping assembly to hold the 0.03mm tungsten wire under a 0.2˜0.3N pretension force is determined. The novel MWPMs can quickly and precisely measure the beam profile density and gain the micrometre-sized minimum resolution by motor moving.

The dipole magnet of the China Spallation Neutron Source (CSNS) Rapid-cycling Synchrotron (RCS) will be operated at a 25 Hz sinusoidal alternating current which causes severe vibration. The vibration will influence the long-term safety and reliable operation of the dipole magnet. For the AC magnet, the girder must have vibration isolator function. It will establish the dynamic modal of the AC diploe magnet by the means of scattered system, and analyze and calculate optimal isolator parameter. Then, according to testing modal analysis and vibration response test, the optimal isolator parameter will be validated. This paper establishes one way of designing dynamic characteristic parameter and it can be used in lots of AC magnet in particle accelerator.

This paper introduces the production process of sextupole magnet for China Spallation Neutron Source. The yoke of sextupole magnet is made of non-oriented silicon steel sheet, at the both side of the yoke, electrical iron has been used as end plate. The large transverse dimension and thin magnet yoke with large beam aperture is easy to cause small deformation. Optimization of the yoke structure has been made to decrease micro elastic deformation. Heat treatment and machining method of the end plate is proposed. Using the finite element method, analyze the influence of machining error and structure style on air gap precision. By using the heel block in the outside of the magnet yoke, the actual measurement of the prototype shows that the polar air gap precision is in the acceptable range.

Traditional Support Vector Machines (SVMs) in solving large-scale sample training, with the solution to occupy a quadratic programming problem slows convergence speed. When a new sample joins together, all samples need to train together is time consuming and limit the scope of use. In view of the above defects, this paper proposed a method based on generalized KKT constraint and boundary vector incremental Support Vector Regression (SVR). The sample of a little effect is deleted timely, while retaining important information. Using the database of sintering process of this method was verified. Theoretical analysis and experimental results show that this method is a more traditional support vector regression algorithm. The training speed is faster and higher accuracy with stability.

Multi-station rotary structure is used in the China Spallation Neutron Source (CSNS) stripper foil. The repeat positioning accuracy of per foil frame is more than 0.5mm, which do not meet the technical requirements, due to the rotary membrane structure and the frame accuracy. This paper researches for the multi-axis synchronous system to control the rotary membrane and achieve the repeat positioning accuracy to be better than ±0.05mm. This paper also researches on the remote control system based on the EPICS and realize the remote control of stripper foil system.

Almost all the electronics and mechanical equipment have controllers to control the entire equipment or some specific component in the equipment to do a certain task. These controllers responds to various types of inputs and performs the function accordingly, one type of input given to the controller is the touch. These controllers, which use human touch by means of either touch screen or buttons. The touch screen will not give haptic feedback to the users whereas the buttons will take up more unwanted space and also causing disturbance and confusion in recognizing due to ambiguity, either buttons are is active, or inactive. In this paper we present a simple way to achieve the buttons on demand, by which the buttons remain flat at the surface when inactive and protrudes out of the surface and appears as a button for operation when active. The design and the functionaility of the controller are presented here. The design and simulation are carried out on Solid Works.

In allusion to the verification of temperature testing and sterilization effects in the tunnel drying oven, a sterilization temperature detection system was designed, including test module, validation module and analysis module, etc. Through the no-load heat distribution test, the full load heat penetration test, the correlation data analysis and the sterilization check to verify the feasibility and rationality of the system to test the temperature of the tunnel drying oven, in accordance with the requirements of the actual temperature measurement and verification of tunnel oven.

In this study, ABAQUS was applied to carry out the numerical simulation of the steel latticed arch affected by impact. The multi-scale model suitable for the steel latticed arch was determined through the comparison of the numerical simulation results between two multi-scale models. The multi-scale model was adopted to analyze the behavior of the steel latticed arch under impact load and the results were analyzed comparing with the element beam model. From the data comparison in the action time of the impact block, the plastic deformation and the internal energy the Introduction, the multi-scale model is proven to be suitable for dynamic impact analysis.

The main goal of the study is to provide a novel adaptive Terminal Sliding Mode (TSM) control scheme to achieve the complete synchronization between master and slave chaotic gyros, in the effectiveness of presenting system’s uncertainties and external disturbances. The proposed control scheme is based on a novel time-varying TSM, named as wrinkling-type TSM. The stability of the adaptive controller is satisfied in the sense of the Lyapunov stability theorem. Numerical simulations are given to verify the effectiveness of proposed scheme.

For the vibration problem of rolling mill under the influence of dynamic characteristics of hydraulic system, time delay state feedback is introduced, and a vibration control model of roll system is established based on the nonlinear stiffness constraint of hydraulic cylinder. The amplitude frequency response of the system is obtained by the method of multiple scales. The actual parameters of rolling mill are used to analyze the impact law of time delay parameters on the mill roll system amplitude frequency characteristics and time domain features. Founding that with the increase of the control gain coefficient, the stability of the roll system is improved. The change of time delay makes the system show complex nonlinear dynamic behavior. Therefore, it is very important to choose the appropriate time delay parameter to suppress the rolling mill vibration, which provides a theoretical reference to control mill stability movement.

Packer is one of the indispensable tools in oilfield operations and its sealing performance is closely related to rubber structural parameters. The rubber structural model is established by ABAQUS software. Different height, camber angle and the thickness of the rubbers are optimized in finite element analysis. By comparing the maximum contact stress between rubber and casing wall, the optimal size is selected. From analysis results, the existence of optimal structure parameters on packer rubber is proved. The maximum contact stress can be reduced by unsuitable value of height, camber angle and thickness, which is not conducive for sealing.

In order to solve the problem that the steel wire gets loose or broken in Multi-Wire-Saw when it works in a high-speed, this paper introduces a control method based on PLC and servo motor, uses the separated integral PID to control the speed of the steel wire when it’s taken on and off accurately. This method improves the stability of the system, even operating at high-speed multi-wire saw. The tension control system can also be used in papermaking, printing and packaging.

In order to improve the scrap-cleaning precision of die-cutting machine, five-polynomial laws are used to fit framework motion curve based on the moving principle of drive cam in scrape-clearer. According to two limiting positions at the start and end of motion, complex number vector method is used to integrate cam link mechanism and calculate cam contour, which has theoretical guidance significance to improving the performance of die-cutting machine contour and scrap-cleaning precision.

The rotation of the feed roller on the inspection machine is achieved by the friction between the tensioning belt and the shaft-end on one side. But in the process of transmission, the uneven force on the shaft-end of both sides causes the deformation of the roller that increases the circular runout of the roller, which results in the uneven force on the printed products and affects the quality of the printed products. This article uses Ansys Workbench to conduct the modal analysis on the roller for the determination of the natural frequency and vibration mode of the roller. It is in accordance with the modal vibration of the roller, conducting the structural optimization of the position with larger amplitude of vibration.

In order to solve the previous problems of big paper-feeding errors and low positioning precision, a new correction positioning device for facial tissue has been proposed. Considering application of traditional mechanical correction devices during laminating and comparison on its advantages and disadvantages, it makes an electrification improvement in structure. Being controlled by motion control cards, utilize servo electromotor drives facial paper tissue correction to make sure that when the rate of paper is less than 12000 piece/h, the fitting error can be controlled within±0.5mm and when the rate is between 12000-15000 piece/h, the fitting error can be controlled within±1.0mm. The test results show that this device effectively improves the precision of adjusting and poisoning of facial tissue.

This article analyzes the strengths and weaknesses of the traditional roll pull guide, raises the necessity of design for a new cylindrical cam roll pull guide, conduct the contour modeling of the swing cam, in accordance with the principle of meshing curved surface of the envelope, and carry on the cam solid modeling in solidworks. This cylinder cam roll pull guide meets the requirement of design and is applied to the lateral positioning process of the die-cutting machine which greatly improves the accuracy of die cutting.

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