汽车车身耐撞性与NVH多学科设计优化研究

Research on Multidisciplinary Design Optimization of Vehicle Body Crashworthiness and Noise,Vibration and Harshness

将多学科设计优化运用在汽车车身耐撞性研究中,通过拉丁方试验设计获取采样数据点,同时,为了提高了计算效率,构建了考虑整车正撞安全性和白车身扭转模态优化设计的多学科系统的响应面近似模型,然后运用序列响应面方法结合多学科可行性方法对近似模型进行优化。避免了传统整车耐撞性和白车身NVH相结合的多学科优化设计方法计算量大,且在碰撞非线性系统优化中常常易导致收敛缓慢甚至不收敛的缺点。在较好地满足CMVDR294安全法规的同时,使得白车身的扭转模态值得到提高,在一定程度上改善了汽车的安全性、舒适性和平顺性。

Sampling points were obtained by using Latin hypercube design of experimental method. In order to improve computing efficiency, a response surface method was employed to construct highly nonlinear crash and torsion mode functions. Response surface approximate functions were optimized by using multidiseiplinary design feasible （MDF） and sequential response surface methods were adopted to avoid much of computing time consume in the traditional optimization method and slow convergence or no convergence in the non-- linear impact and NVH systems. It improves first torsion mode frequency of the Body--In--White（BIW） vehicle and safety, comfort and smooth performance of the full vehicle in meeting the requirements of regulation CMVDR294.