Design Optimization of Vehicle Body Structure Based on Side Crash Safety
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摘要: 针对车身的侧面碰撞安全性与轻量化两学科相互制约的问题,建立某SUV侧面碰撞仿真模型进行研究,并对其仿真结果进行分析,分析得到对车身安全性有重要影响的关键构件并将其厚度作为设计变量;通过均匀试验设计获取试验数据,并用逐步回归方法构造整车侧碰安全性和轻量化等性能相关的响应面近似模型,然后运用序列二次规划法(SQP)结合基于自适应加权的多目标优化方法对车身结构进行多学科协同优化。在保证整车轻量化目标的同时,显著提高了车身侧面碰撞安全性。Abstract: Considering that car body side crash safety and lightweight are mutual restraint issues,a SUV side crash simulation model was established to study this problem. The key components which have significant influence on the vehicle body safety was determined through analysis of the simulation results. Then their thicknesses were taken as design variables. With the experimental data obtained by uniform experimental design,the stepwise regression method was used to construct response surface approximation model considering two factors,namely vehicle side crash safety and lightweight. Then applying the sequential quadratic programming(SQP) method combined with adaptive weighted multi-objective optimization method,the multidisciplinary collaborative optimization of the vehicle body structure was carried out,thus the results show that the side body crash safety was significantly improved while the vehicle lightweight design was ensured.
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