Research on Impacting Loads between Metro Vehicles

Abstract

In order to research impacting characteristics of the trainset, the impacting model and governing equations are established, in which, the stiffness and nonlinear damping of a buffer, friction force between rail and the vehicles wheels is considered. The stiffness and nonlinear damping of the buffers used in the model is verified by testing results. By numerical simulation, it is found that when moving trainset impacts standing trainset, because the impacting force, stroke of the buffers located in impacting interface is the maximum, the buffers capacity must be large enough to avoid rigid impact. The impacting force, comfort and safety of moving vehicles or standing vehicles far from the impacting interface with the same distance are nearly same. The farer the vehicle is from impacting interface, the little the vehicles damage is, and the safer the passages are. When vehicles are more, the maximum impacting force is constant approximately; when vehicles are fewer, the maximum impacting force descends obviously. If vehicles are fewer, after impacting, it takes short time for trainset to stop.

Application of Six Sigma method in optimisation design of vehicle anti-explosion components

“…Based on the results of experiments and analysis, the following conclusions are drawn: (1) By comparing the deterministic optimisation of the Pareto frontier with the Six Sigma-optimised Pareto set, the Six Sigma-optimised Pareto set is more conservative. (2) The effect of bolt and weld failure on the protection performance of the anti-explosion component cannot be ignored. (3) For highly nonlinear engineering problems, the neural network model has good fitting accuracy, and the NSGA-II optimisation algorithm can predict the optimisation results very well.…”

“…1 The answer to improving the armoured vehicles' anti-explosion protection capability of ensuring the safety of occupants has become a research topic at the cross-disciplinary frontier. 2 In the past, the design of anti-explosion protective components was based on deterministic optimisation. However, the effects of uncertain factors on the design of anti-explosion protective components have been rarely considered.…”