基于混合模型汽车结构耐撞性的可靠性优化设计  

Reliability-based design optimization for vehicle structural crashworthiness based on hybrid model

作　　者：刘鑫[1,2] 张远洋 LIU Xin;ZHANG Yuan-yang(Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road&Traffic Safety of Ministry of Education,Changsha University of Science&Technology,Changsha 410114;Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle,Changsha University of Science&Technology,Changsha 410114)

机构地区：[1]长沙理工大学道路灾变防治及交通安全教育部工程研究中心,湖南长沙410114 [2]长沙理工大学工程车辆安全性设计与可靠性技术湖南省重点实验室,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2021年第1期95-101,共7页Journal of Changsha University of Science and Technology:Natural Science

基　　金：湖南省自然科学基金资助项目(2017JJ3323);长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(kfj170401)。

摘　　要：针对多种不确定性因素对汽车结构耐撞性产生的影响,本研究提出了一种基于混合模型汽车结构耐撞性的可靠性优化设计方法。首先,建立了基于概率-区间混合模型汽车结构耐撞性的可靠性优化设计模型,并分析其嵌套情况;然后,为了减少嵌套层数,提出了一种高效的解耦策略,将原始的嵌套问题等效转化为单层的优化设计问题;最后,使用径向基函数构建了近似可靠性优化设计问题,并采用局部加密策略提高优化结果的精度。研究结果表明:该方法收敛迅速,能够达到对混合模型汽车结构耐撞性的可靠性优化设计问题快速求解的目的,对汽车结构耐撞性的优化设计具有一定的参考价值。Aiming at the influence of uncertainties on the vehicle structural crashworthiness,a reliability-based design optimization(RBDO)method for vehicle structural crashworthiness based on hybrid model was proposed.First,a RBDO model for vehicle structural crashworthiness based on probability and interval hybrid model was established,and the nesting level was analyzed.Then,in order to reduce the nesting,an efficient decoupling strategy was proposed,which transformed the original nesting problem into a single-layer design optimization problem.Finally,the approximate RBDO problem was constructed by using the radial basis function.The local densifying strategy was employed to improve the accuracy of the results.The research results show that the method converges rapidly,and the RBDO problem of vehicle structural crashworthiness is solved quickly.It has a wide application prospect in the field of vehicle crashworthiness design optimization,which has certain reference value for the design optimization of vehicle structural crashworthiness.

关 键 词：混合模型 汽车结构耐撞性 可靠性优化设计 解耦策略 局部加密策略 

分 类 号：TB114.3[理学—概率论与数理统计]