多元非线性回归的铝合金覆盖件成形模拟优化设计

Numerical Simulation and Optimization of Aluminum Alloy Auto Panel Forming by Multivariate Nonlinear Regressing

使用3参数Barlat-Lian屈服准则,通过Dynaform软件模拟铝合金覆盖件保护梁的拉深成形,获得拉深筋截面凸筋圆角半径、拉深筋的高度与最大等效应力、最大变薄率之间的关系数据;通过多元非线性回归处理数据,分别建立拉深筋的凸筋截面尺寸与最大等效应力、最大变薄率的目标函数数学模型。通过加权将多目标函数优化转化为单目标优化数学模型,优化求出凸筋截面尺寸的优化解。模拟验证覆盖件的成形,获得了满足设计要求的结果。

Based on the three-parameter Barlat-Lian yield criteria, the aluminum alloy auto panel strength beam forming was simulated by Dynaform software. The data of max equivalent stress and max thinning were acquired by designing the draw bead section punch radius and the draw bead depth. The mathematics model between max equivalent stress, max thinning and draw bead section punch radius, draw bead depth, was built by multivariate nonlinear regressing. The multivariate nonlinear objective model was transformed into single objective model using the weighting function method, then the mathematics model was optimized and the optimized draw bead section values were obtained. Finally, the auto panel was simulated again based on the optimized result and the simulated results showed that the result was available.