基于代理模型的汽车乘员约束系统性能优化

针对汽车碰撞乘员约束系统优化设计中多参数和非线性问题,提出了基于径向基函数代理模型的优化设计方法,通过LS-DYNA分析软件建立正面碰撞乘员约束系统的仿真模型并对其进行验证.基于该模型选取对响应影响较大的设计变量作为优化变量,在LS-OPT中选择径向基函数构建代理模型,采用空间填充试验方法进行试验设计,运用自适应模拟退火算法进行优化求解.优化结果表明:人体综合损伤WIC值相比初始设计值降低了28.2%,实现了对设计目标的优化.

Performance improvement of occupant restraint system based on surrogate model

Aiming at the problem of multi-parameter and nonlinearity in the optimal design of occupant re-straint system,a method of parameters optimal design based on radial basis function is proposed.A sim-ulation model of occupant restraint system for frontal impact is built by means of the occupant inj ury a-nalysis software LS-DYNA and the verification of the model is carried out.On the basis of the model, the design parameters which are more important to response are chosen as optimization variables.Addi-tionally,radial basis function agent model is constructed in software LS-OPT.Space filling method is used for experimental design,and adaptive simulated annealing algorithm is used to realize optimal de-sign.The results of optimal design indicate that the value of human inj ury WIC (Weighted Inj ury Criteri-on)is reduced by 28.2% in contradistinction to initial design values.The method realizes the optimum results for the design obj ect.