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Step-by-step Energy Absorption Method Based on Reverse Design Theory and Its Application Study

Author: WeiQiYong
Tutor: CaoLiBo
School: Hunan University
Course: Vehicle Engineering
Keywords: Before the crash safety Mini buses Stepwise energy absorption Backstepping design
CLC: U462
Type: Master's thesis
Year: 2008
Downloads: 87
Quote: 3
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Abstract


Mini buses because of the economical and suitable, compact, flexible features, has a vast market in the country. Mini buses, however, is limited by vehicle size, you need to use as short as the front of the energy-absorbing structure to absorb collision energy, so as to achieve to meet the frontal crash regulations experimental purposes. Typically, car front energy absorbing structure square stringers by Stringer fold deformation when the collision to achieve the desired energy absorption effect. However, the mini buses stringer size change is limited by the structural arrangement of the wall thickness increase will lead to the stringers produce folding deformation difficulties, the collision peak acceleration increases, and increase the quality of vehicle. Therefore, for the requirements to shorten the length of the energy absorption of the models, merely using the method of changing the the stringer structure size and thickness is difficult to achieve good results, study the development of a new energy absorbing structure has an important significance. This article put forward innovative the the stepwise energy absorption method based backstepping design theory. The method in accordance with the requirements modeling and regulations experimental anti push the front of the mini bus suction can the length of the structure to determine its ideal collision acceleration range. Proper control of the energy absorption beam wall thickness, the proper position of the beam energy absorption of different lengths within the reinforcing plate, so that it progressively involved in the energy-absorbing, so as to achieve the purpose of controlling the acceleration waveform. Energy absorption based on the step by step method, a minibus, a stepwise energy absorbing thin-walled structure stringer size based on the car's design, and to establish and validate the finite element model. Surrogate model-based optimization method to verify the level of energy absorption in a finite element model of the structure through the use of crashworthiness optimization of the parameters of the energy-absorbing wall thickness of the structure, strengthen the position of the plate and solder joint spacing optimized more ideal energy absorbing effect. Will optimize the structure after application to the vehicle, and adjusts the stiffness of the part of the member, such that the amount of deformation before the passenger car during a collision portion significantly reduced, and ensures that the regulations of the occupant damage value. The thesis research showed that: in the car before the collision safety improvement design based the backstepping design theory level energy absorption method is practicable, in accordance with the method designed the stepwise energy absorbing structure in a shorter absorption The collision energy can be absorbed in length vehicles in order to effectively improve the vehicle before the crash safety, conducive to increased car passenger space, improve comfort and to improve the market competitiveness of the products.

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CLC: > Transportation > Road transport > Automotive Engineering > Vehicle design and calculation
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