复合材料控制臂的多区域铺层结构优化

Optimization of Multi-area Layup Structure for Composite Control Arm

使用碳纤维复合材料设计某乘用车悬架控制臂,对4个区域的铺层结构进行优化设计。首先以各角度铺层厚度为设计变量对控制臂模态频率、质量和各工况应变能进行优化;然后以前三阶模态频率为目标,弯曲刚度参数作为设计变量优化铺层顺序。针对设计变量间存在的工艺约束条件使样本空间不规则且优化变量较多的问题,利用聚类分析进行试验设计确定训练近似模型需要的样本点,并用高斯过程回归方法建立近似模型以减少计算时间,验证模型R2在0.9以上。两步优化后,对比复合材料初始铺层各性能指标均有不同程度改善,复合材料质量减少11.4%;对比原钢制控制臂,各性能均满足要求,质量降低37.1%。

The layup structure in 4 areas of the suspension control arm of passenger car by using carbon fiber composite is optimized.Firstly,the layer thickness of each angle was regarded as the designing variable to optimize the modal frequency,quality and strain energy under each working condition of control arm.Then the modal frequency was regarded as the target,and the bending stiffness parameter was used as the designing variable to optimize the layup order.Based on the design of experimental of cluster analysis method,the sample points of the approximate model were determined.The Gaussian process regression method was used to establish the approximate model to save the computation cost,and the value of R2 in verification model was above 0.9.After two-step optimization,the performance indexes of the initial designing plan are improved to some extent and the composite materials are reduced by 11.4%.Comparing with the steel control arm,the mass is reduced by 37.1%to meet all the requirements.