基于隐式参数化建模的发动机舱盖结构优化

Structure Optimization of Engine Hood Based on Implicit Parametric Model

为提升某发动机舱盖模态频率与刚度性能,建立隐式参数化模型。以结构在不同约束或加载位置下表现出不同的刚度性能为依据,研究此发动机舱盖的缓冲块在不同位置处对刚度性能的影响。将此作为设计变量,结合发动机舱盖断面尺寸,支撑梁位置设计变量进行多目标优化并研究了各变量对性能的影响。结果表明,缓冲块沿整车坐标系下的X向及Y向移动,对各项刚度性能均有不同程度的影响。同时,多目标优化对弯曲刚度及前角刚度性能有明显的提升,获得了更为合理的结构。

In order to make the mass and performance of car door reasonable match and determine the reasonable structure of car door in the early design stage,an implicit parametric model of car door is built by using SFE-Concept,part size and position are taken as size variable,and parts thickness is taken as thickness variable.A multi-objective optimization of the size optimization and thickness optimization is done by using NSGA-Ⅱoptimization algorithm within a single optimization flow.The first mode performance of the door is improved by 12.1%,and the lower stiffness performance of the door is improved by 14.4%.The mass and other performance of the door is basically the same.