Design and Optimization for Multistage Energy-Absorption Structures in EMUs under Whole Train Collision

Abstract

The objective of the present study is to investigate the influence of impact platform force of main energy-absorbing structures on energy dissipation and deformation pattern of a train body in electric multiple units (EMUs) collision. For this purpose, the paper developed a model of train based on the impact energy dissipation map of a train and the mechanical deformation properties of each energy-absorbing structure, with this model, the algorithm combined one-dimensional multitude rigid bodies and structure large plastic deformation was employed. The train-to-train collision was simulated by the model. The research indicated that the main energy-absorbing structures impact platform force of themselves and their mutual matching relationships have an important effect on the distribution of energy absorption proportion in each train during collision. Then the parameter optimization design was earned out in order to obtain the optimal impact platform forces of energy-absorbing structures. The design model used a full factorial design method to determine the simulation calculation conditions. The methods of quadratic response surface, stepwise regression and genetic algorithm were employed to solve the multi-objective optimization model.