基于RSM和NSGA-Ⅱ的驱动桥壳变截面多目标优化  

Variable-section multi-objective optimization of drive axle housing based on RSM and NSGA- Ⅱ

作　　者：杜晓冬 陈焕明[1] DU Xiaodong;CHEN Huanming(School of Mechanical and Electrical Engineering,Qingdao University,Qingdao 266000,Shandong,China)

机构地区：[1]青岛大学机电工程学院,山东青岛266000

出　　处：《农业装备与车辆工程》2024年第5期42-46,共5页Agricultural Equipment & Vehicle Engineering

摘　　要：以某商用车驱动桥壳为研究对象,为提高其综合性能,利用响应面法(RSM)与非支配排序遗传算法(NSGA-Ⅱ)相结合的方法对桥壳变截面进行多目标优化。基于Creo建立桥壳参数化模型,联合Workbench对其进行静力学和模态有限元仿真,以参数灵敏度分析筛选后的桥壳变截面为设计变量,以桥壳最大变形量、1阶频率和质量为优化目标,采用中心复合试验设计(CCD)方法生成样本空间,基于样本数据构建反映试验因素与性能指标关系的2阶响应面模型并进行拟合精度验证;利用NSGA-Ⅱ对桥壳变截面进行多目标优化,获得满足条件的Pareto前沿解。研究结果表明:优化后的驱动桥壳在性能指标满足设计要求的前提下,质量减轻6.61%,最大变形量减小7.28%,1阶频率提高2.23%。For the sake of the comprehensive performance of a commercial vehicle drive axle housing,the response surface method(RSM)combined with non-dominated sorting genetic algorithm(NSGA-Ⅱ)was used for optimizing the variable cross section of the axle housing.The parametric model of the axle housing was established based on Creo,and the static and modal finite element simulation was carried out with Workbench.The variable cross-section of the axle housing after parametric sensitivity analysis was taken as the design variable,and the maximum deformation,first-order frequency and weight of the axle housing were taken as the optimization objectives.The sample space was generated by the central composite design(CCD)method.Based on the sample data,a second-order response surface model reflecting the relationship between test factors and performance indexes was constructed,and the fitting accuracy was verified.On this basis,NSGA-Ⅱwas used to optimize the axle housing with variable section,and the Pareto frontier solution satisfying the conditions was obtained.The results showed that the optimized drive axle housing could reduce the weight by 6.61%,reduce the maximum deformation by 7.28%,and increase the first-order frequency by 2.23%when the performance index meets the design requirements.

关 键 词：驱动桥壳 有限元分析 多目标优化 响应面模型 NSGA-Ⅱ算法 

分 类 号：TH122[机械工程—机械设计及理论] U463.218[机械工程—车辆工程]