客车车体碰撞吸能结构优化设计方法研究

Research on optimization design method for passenger carbody endergonic structure

为实现车辆吸能部件结构优化,提出一种将建模软件I-DEAS、碰撞软件ANSYS/LS-DYNA和多学科优化软件ISIGHT有机结合在一起的优化设计方法。将第一次成功碰撞仿真的ANSYS/LS-DYNA模型的批处理命令流从后台调到前台,再按照ISIGHT语义要求,在命令流文件中定义优化目标,设计变量及约束条件,然后采取遗传算法(GA)和序列二次规划算法(SQP)的组合优化方案,对吸能结构进行优化设计。以某地铁车车体为应用对象,给出该方法对地铁车车体吸能部件结构优化设计的全过程,获得了车体端部合理的吸能结构。

In order to realize the optimization of the endergonic structure, provides a optimization method by the integration of the I-DEAS,ANSYS/LS-DYNA and ISIGHT softwares. Through the transfer of the command current that is produced by the first simulation results, complete the definition of the optimization objective,design variable and restriction conditions, then to realize the optimization design through the GA and SQP arithmetic. Take an underground vehicle for example, the optimization process of the endergonic structure is shown, and finally the reasonable structure is acquired.