Dynamic characteristics of the cab of a heavy commercial vehicle were analyzed using finite element mode analysis theory; it was proved to be right by the corresponding modal test. Some assembly thicknesses were chosen as design variables

using sensitivity analysis, and the optimization problem was built with torsion stiffness constrained, and the first order mode as well as lightweight designed.The surrogate models of radial basis function and micro multi-objective genetic algorithm were adopted,then model manage technique was used to update and strictly control the error from surrogates.

 At last, many non-dominated solutions with low errors were obtained, and many design schemes were offered. The first order mode is improved obviously and the weight is lighted.

cab, experiment modal analysis, surrogate model, micro multi-objective genetic algorithm, optimization design

利用有限元模态分析理论,分析了某重型商用车驾驶室的动态特征,并结合试验模态分析,验证了驾驶室有限元模型的正确性。利用该有限元模型进行灵敏度分析,找到对一阶模态影响大的部件,以它们的厚度为优化变量,以扭转刚度为约束,以一阶模态和驾驶室质量为优化目标,建立多目标多约束的优化模型。运用径向基函数代理模型和微型多目标遗传算,结合模型管理技术更新代理模型,并严格控制代理模型的误差。最后获得大量误差很小的非支配解,为设计提供多种参考方案,驾驶室模态得到明显改进,质量也有所降低。

驾驶室, 试验模态分析, 代理模型, 微型多目标遗传算法, 优化设计