摘要
以基于全量理论的反向模拟法为仿真工具,将变形前后所有单元厚度相对变化之和作为衡量成形零件的变形均匀性的标准,以单位长度拉延筋阻力为优化设计变量,采用敏度分析法,对拉延筋阻力的布置进行优化。利用推导的敏度信息,结合反向模拟法计算的应力应变信息,采用非线性规划优化算法FSQP,更新设计变量,实现目标函数最小化,直至迭代平衡,输出优化结果。Numisheet2002某汽车翼子板的计算实例中,通过优化结果与基于增量理论的Dynaform软件计算结果比较,证明了采用反向模拟法与灵敏度分析法相耦合的方法进行拉延筋设计的高效性。
Inverse analysis method was used as simulation tool based on deformation theory of plasticity.The objective function was expressed by the sum of thickness variation of each element before and after deformation.The intensities of the drawbead restraining forces were taken as design variables.Sensitivity analysis was implemented to optimize the distribution of drawbead restraining forces.These sensitivity information and the resulting strains and stresses distribution by inverse analysis method were given to the non-linear constrained optimization algorithm FSQP,which updated the design variables in order to minimize the objective function.The optimized results were output until the iterations convergence.Numisheet＇2002 drawing benchmark of a vehicle fender demonstrates that this strategy can quickly obtain the optimized process parameters,which is verified by incremental theory based on software Dynaform.
出处
《锻压技术》
CAS
CSCD
北大核心
2011年第5期27-32,共6页
Forging & Stamping Technology
关键词
反向模拟
敏度分析
板料成形
拉延筋
inverse analysis
sensitivity analysis
sheet stamping
drawbead
