基于目标驱动优化技术的自冲铆接机C型框架结构优化

Structure optimization of C-frame self-piercing riveting machine using goal driven optimization

通过确定自冲铆接机C型框架优化设计的目标函数和约束条件,提出一种基于目标驱动优化技术的C型框架结构优化方法。首先,建立C型框架有限元模型,以C型框架极限工况为条件进行静力学分析。其次,确定C型框架的载荷和边界条件,以等效应力和总变形量为约束条件,以质量最小化为目标对C型框架进行拓扑优化设计。最后,基于拓扑优化结果提出C型框架形状优化模型,利用中心复合试验法和哈默斯利抽样技术,进行权衡排序,获得较优的初始种群,并且通过决策支持流程得到3组候选样本点,从中确定最优解。数值优化结果表明:C型框架质量减轻了16%,其静强度得到明显改善,说明本文提出的优化方法是有效的。

An optimal method based on goal driven optimization was presented by determining the objective function and constraint conditions for optimal design of the C-frame structure of self-piercing riveting machine. Firstly, the finite element model of the C-frame was performed, and static analysis of C-frame considering the limit working conditions was carried out. Secondly, topology optimization of the C-frame was developed in order to minimize the mass under the constraint of equivalent stress and total deformation. Lastly, a shape optimization method of C- frame based on the results of topology optimization was put forward. The optimal initial population was obtained through weighting the sort using the central composite design （CCD） and the shifted HAMMERSLEY sampling method. Therefore, three groups of candidate sample point were generated through the decision support process （DSP）. The optimal solution was obtained from them. The numerical results show that the mass of the C-frame can be decreased by 16%,and the static strength requirement is satisfied,which shows that the proposed optimization method is effective.