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Optimization Design on the Crashworthiness of Automobile Door Based on RSM

Author: LiQiang
Tutor: XuTao
School: Jilin University
Course: Solid Mechanics
Keywords: Crashworthiness side door Response surface methed regressive orthogonalcomposite design Genetic Algorithm
CLC: U467.14
Type: Master's thesis
Year: 2011
Downloads: 272
Quote: 6
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Abstract


In the world today, security has been playing a more and more important role in automotive development. With the improvement of living standards, vehicle safety has paid people more and more attention. As the development of computer technology and finite element method, the research for the numerical simulation of automotive passive safety which can save a lot of time and economy has got a new breakthrough. Since the emergence of mature commercial software LS-DYNA, PAM-CRASH, RADIOSS, RSM and GA have been combined with optimization design on the crashworthiness of automobile to achieve very remarkable result. At the same time, the high accuracy and efficiency of RSM for structural optimization have been proved. In China, the complicated traffic and hybrid vehicle easily leaded to side impact. The data showed that in car accidents, the highest mortality rate happens on side impact passengers, so improving side crashworthiness could effectively reduce the passenger casualty rate. The side door of an autobody was chosen for side crashworthiness for optimization design on the main energy absorption components based on RSM and GA. This article shot at improving side crashworthiness and providing reference data without increasing the total mass.For the CAD model, structural performance analysis for the detailed finite element model of the side door first has been carried out to make sure reaching the stiffness requirements (sink stiffness, torsional stiffness) and strength. Then crashworthiness analysis has been done to get the reference data about the energy absorption, displacement and impact force on side impact.Some reasonable samplings for the design variables (the main energy-absorbing parts- reinforcement plate and the thickness of upper and lower side crash beams) were selected by quadratic regressive orthogonal-composite design. According to the result of testing, the approximate model for the response of energy-absorbing parts of the side door (Ein、Fmax) was established based on RSM. Then error analysis aiming at getting the approximate model of high accuracy has done on the basis of the determination coefficient of the approximate response surface model and adjusted determination coefficient. Optimization design on the response of the door (Ein、Fmax) based on GA and analyzing the design variables after optimization and before have been completed, finally. The results not only reduced the resultant force of the maximal contact surface crash force, but also improved the energy absorbed.

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