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借助Dynaform数值模拟软件建立某型号发动机隔热罩的冲压成形仿真模型。在此基础上,选取冲压工艺参数为优化变量,定义最大减薄率和起皱率为评价指标,由此构建加权目标函数,采用均匀设计安排数值模拟试验和回归分析法分析试验数据,建立了工艺参数与加权目标函数的二次多项式回归模型,利用实数编码遗传算法对隔热罩冲压成形的最优工艺参数进行求解。数值模拟优化结果表明,针对隔热罩仿真模型,优化后的最大减薄率和起皱率分别为24.748%和6.791%,控制在较好范围内。
Using Dynaform numerical simulation software to establish a model of engine heat shield forming simulation model. On the basis of this, selecting the stamping process parameters as the optimization variables, defining the maximum reduction rate and the creasing rate as the evaluation index, thus constructing the weighted objective function, using the uniform design arrangement numerical simulation test and the regression analysis method to analyze the experimental data, Process parameters and weighted objective function quadratic polynomial regression model, the use of real-coded genetic algorithm for heat shield stamping of the optimal process parameters are solved. Numerical simulation results show that for the simulation model of heat shield, the optimized maximum reduction rate and crease rate are 24.748% and 6.791%, respectively, which are controlled within a good range.