Narrow Results

To exactly study the riding comfort of passengers in urban rail transit trains, a coupling vibration model, including passengers, train, and bridge is proposed in this paper. According to the Lagrange Equation, the differential equations of motion of each part are derived, which are coupled with each other through displacement and dynamic interaction forces. A corresponding calculation program is compiled by the Fortran language. A representative steel-concrete composite girder bridge on Beijing Metro Line 5 is selected as the research background, the dynamic responses of passengers and train are simulated in detail, and the dynamic response differences between the passenger and carriage are compared. The passengers’ riding comfort is evaluated according to ISO-2631 Standard based on the simulated data. The result shows that passengers in the middle carriages of the train feel better than those in the head and tail ones. While in the same carriage, passengers on the middle seats feel better than those on both ends of it. If only vibration is considered, passengers will feel better in a fully loaded carriage than those with few passengers. The riding comfort of passengers will be gradually reduced with the increase of the train speed.

With the increasing development of electric vehicle technology, people have a growing pursuit for the riding comfort of electric vehicles. Compared to fuel vehicles, the driving motor of the electric vehicle has the mechanical characteristics of low-speed constant torque and high-speed constant power, which leads to their stronger accelerations, which also makes the development of electric vehicles face the risk of reduced riding comfort. In order to better explain this issue, this chapter starts from the human body comfort and analyzes the relationship between acceleration during the starting, breaking and turning processes of electric vehicles and the subjective feelings of the human body. Besides, an acceleration model for electric vehicles is established, which provides a detailed analysis for the riding comfort of electric vehicles.