基于结构拓扑优化方法的发动机支架轻量化设计

Light-weight design on engine support based on structural topology optimization method

为实现某发动机支架轻量化设计,在支架总成整体结构有限元分析的基础上,运用等效刚度原则建立支架局部有限元模型,得到不同工况下的支架位移分布结果.基于TOSCA软件,通过提取结构分析结果对支架结构拓扑优化模型进行敏度分析并形成优化模型列式.优化求解后,在每轮循环迭代中将新的单元密度值重新赋予结构模型,直至满足预先给定的收敛判定条件;设置过滤半径和各类制造加工约束,消除结构拓扑优化中的数值不稳定性问题,改善优化结果的可加工性.对优化前后的计算结果进行对比分析.

To implement the light-weight design for an engine support, the finite element model of its local support is established based on the global structure finite element analysis of support assembly according to equal rigidity principle, and the support displacement distribution results under different loading cases are obtained. The sensitivity analysis is done on structure topology optimization model of support by extracting the structural analysis of TOSCA, and the optimization model formulations are obtained. After the optimization solution is done, the obtained density values of every element are used to update structural model in each round of iteration and the iteration is stopped if the predetermined convergence condition is met. Filter radius and some manufacturability-based constraints are added to the structural topology optimization model to eliminate the numerical instability and improve the manufacture feasibility of optimized results. The comparison of computation results before and after optimization is made.