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Stringer structure analysis based on the previous mini-car crashworthiness research

Author: WangMeng
Tutor: WangJunJie
School: Shanghai Jiaotong University
Course: Mechanical Manufacturing and Automation
Keywords: Frontal collision Front rail Energy absorption The average crushing strength
CLC: U467.14
Type: Master's thesis
Year: 2012
Downloads: 55
Quote: 0
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Abstract


In the process of developing a new car, crash safety is one of the key concerns. Front side of a vehicle frontal crash energy absorption during the main part, determines the response of the body during a collision situation. In-depth understanding of the structural characteristics of stringers, stringers rational design of the structure of the vehicle crashworthiness research is significant. This study in a mini-car frontal impact crashworthiness improve analytical background for mini-car front side and its connecting structure for a more systematic theoretical analysis and simulation, put forward to improve the miniature car crashworthiness ideas. Specific work is as follows: 1. Establish the finite element model of vehicle, complete mini-car frontal crash simulation. The results show for the collision problem, pointing out the problems in the body structure, and proposed direction for improvement. (2) For global features (wall thickness, cross-sectional dimensions, material properties, etc.) on the front side of the crushing process to analyze the impact. 1) Fixed Weigang Chen folding unit theory, complete hat section tube beam average crushing strength expressions theoretical derivation. Contrast previous expression, this article the expression evaluates more close to experimental results. As can be seen from the calculation expression, cross-sectional dimension than the wall thickness of the tube beam energy absorbing impact. 2) According to V.Tarigopula physical experiments, the establishment of appropriate size hat section tube beam dynamic and static crush simulation model. Simulation and experimental results converge. 3 for the local feature (plane deformation induced slots and holes) on the front side of the crushing process to analyze the impact. The results show that compared to the hole surface, inducing deformation of the groove during the presence of the peak crush strength was significant. Deformation-induced increase in the number of slots that can increase the average crushing strength values, improving the structure absorbing effect. 4 for the relevant connection structure (front beam, front pillar, etc.) on the front side of the crushing process to analyze the impact. Analysis showed freestanding front beam structure better; reinforcement on front cover and the front side of the crushing characteristics of relatively significant. 5 above analysis, given the structure of the front side frame and related improvements. According to an improvement program to improve the original model, simulation again. Improved vehicle model in a frontal collision deformation of the structure has been effectively controlled. This study, in order to further study the structure of stringers and mini cars improved crashworthiness provides valuable ideas and experience.

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CLC: > Transportation > Road transport > Automotive Engineering > Vehicle test > Vehicle test > Safety, collision and destruction test
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