Narrow Results

Bogie is one of the most major mechanical part of railway train. Its security and reliability are of paramount importance. Since research in this field is still on the early stage, which focus on either mechanical structure without condition or binary coherent systems. A multistate network flow model has been proposed in this paper with consideration of components degradation level and functional interaction between them. Firstly, the structure and function of the bogie for CRH3 were made a detailed introduction. Then transmission paths of three types force on bogie were study to determine the network strcture. Different from other papers, arcs represent the components and nodes are the transitive relation. Arc capacity tends to be confirmed easily with utilization of performance deterioration of elements on bogie involved in force tranferring. Flow rate of each arc depends on both component' health status and the task it undertakes. Furthermore, the minimal paths (MPs) method and the recursive sum of disjoint products (RSDP) with ordering heuristics are used for system reliability calculation; and the relative probability importance of each basic component and system reliability with and without forehead information are given at last. The results show that the network flow model works well on CRH3 bogie, and can support as guidance of bogie system design, daily system operation and predictive maintenance.

As a fast and punctual mode of travel, the subway has made definite contributions to the easing of traffic pressure. Because the bogie is an important part of metro vehicles, its structure's rationality and the components' performance will directly affect the safe operation and dynamic performance of the vehicle. This paper describes the static loaded test bed for metro vehicle bogie, which includes the composition, performance, functions and features of the test bed, and it will provide some reference for the determination of metro vehicle bogie parameters.

This paper aims at the buffing technology development of high-speed train bogies. Requirements of buffing welded joints for the bogie were presented. The adaptability of plane weld, dovetail fillet weld and part of girth weld by using different grinding dynamic tools and cutters were studied, looking for grinding wheel and abrasive belt which are suitable for fine grinding. Existing problems in the buffing process of bogie welded joints at different positions were analyzed. The results showed that different cutters should be applied to different welded joints according to actual situation. Due to the complexity of buffing position, off-line programming technology for robot automatic buffing are necessary to be developed, and buffing efficiency, cost and feasibility should be considered.

This paper aims at the buffing technology development of high-speed train bogies. Requirements of buffing welded joints for the bogie were presented. The adaptability of plane weld, dovetail fillet weld and part of girth weld by using different grinding dynamic tools and cutters were studied, looking for grinding wheel and abrasive belt which are suitable for fine grinding. Existing problems in the buffing process of bogie welded joints at different positions were analyzed. The results showed that different cutters should be applied to different welded joints according to actual situation. Due to the complexity of buffing position, off-line programming technology for robot automatic buffing are necessary to be developed, and buffing efficiency, cost and feasibility should be considered.