基于损失模型的动车组排障器稳健优化设计

The robust optimization design of EMU cowcatcher based on loss model

以损失模型为理论基础,利用正交表对排障器型材板厚和外力等内外界影响因素进行参数组合设计,通过计算信噪比方差确定影响排障器静强度稳健性的显著因素,结合排障器质量等因素得到排障器型材板厚最佳的参数组合。利用蒙特卡洛法进行抽样模拟计算,得到结构优化前后目标响应的平均值与均方差。研究结果表明,进行稳健优化后的动车组排障器强度提高、质量减小,质量特性得到改善,提高了动车组排障器抗外界影响因素干扰的能力。

In order to improve the robustness in static strength,it uses the loss model to optimize the structure of the EMU＇s cowcatcher.It introduces orthogonal tables,designs the parameter combinations of internal and external influencing factors such as cowcatcher＇s plate thickness and external force.Taking the variance of signal-to-noise ratio to determine the significant factors for the cowcatcher＇s robustness,it combines the weight with other factors to select the best parameters of plate thickness,uses Monte Carlo sampling simulations to calculate and compare the mean and mean square error of target response before and after optimization.The results show that the optimal design improves the strength,the weight and the quality characteristics of the EMU cowcatcher,enhances the anti-interference ability of the EMU cowcatcher.