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Axial Compression Process Research of Array Structure and Its Application in Subway Cars

Author: HuLiXiang
Tutor: TianHongQi
School: Central South University
Course: Traffic and Transportation Engineering
Keywords: thin-walled energy absorption array structure traincollision Finite Element Simulation
CLC: U298.1
Type: Master's thesis
Year: 2012
Downloads: 2
Quote: 0
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Abstract


Heavy casualties and property losses caused by traffic accidents are shocking to people, and it is necessary to provide effective protection for the vehicles and passengers without delay. The thin-walled structure energy absorbing device can absorb huge kinetic energy occurred in collision, reducing accident casualties and loss. This paper proposes the modular array of energy-absorbing structure on the basis of traditional thin-walled energy-absorbing device. And applying to the impact resistant the subway vehicle collision numerical simulation. Aims to provide some ideas for the energy-absorbing structure design.Through a comparative analysis to determine array structure numerical calculation model.Using finite element software LS-DYNA to conduct numerical simulation for array structure compression process, selecting appropriate grid size through a comparative analysis. Comparing with axial compression results of a single round tube and square tube under the same conditions to determine the differences of deformation mode and energy absorption characteristics. Making a detailed analysis of the affect of tube cell density, wall thickness, square tube size, impact velocity, steel wall quality to the axial compression process, and obtaining the law of the impact. Making axial compression performance assessment of array structure in the case of non-ideal. Considering the impact of tube grid gap, elastomers, and partial load conditions to axial compression performance of the array structure and determining the degree of partial load the structure can withstand. Establishing predictive equation of energy absorption and average impact force about the wall thickness, speed, tube cell density, cross-section side length to predict the energy absorption characteristics and mechanical properties of array structure. Comparing the result with the intuitive analysis and making the significance test about regression equation and coefficient. To optimize the structure of the array, and assess the mechanics and energy absorption characteristics of array structural in the condition of preload, cone-shaped and induced groove. Apply ing the array structure with induced groove to the crash simulation of impact resistance subway vehicle. Making the collision analysis of car with steel wall and two cars. By a large number of numerical simulation of the array structure analysis.The structure is confirmed to have the advantages of compression process smooth, high specific energy absorption, small fluctuations force curve. It is an ideal energy-absorbing structure. The results of this study can provide ideas to the design of array energy-absorbing structure and depth research.

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