基于虚拟激励法和辛数学方法的高速列车平稳性优化

Optimization of the Ride Comfort of High Speed Trains Based on the Pseudo Excitation Method and the Symplectic Mathematical Method

应用虚拟激励法和辛数学方法建立了虚拟简谐载荷作用下车辆-轨道耦合系统的低自由度运动方程;基于ISO 2631—1—1997国际标准,提出了以平稳性为指标、以车辆悬挂装置参数为设计变量的最小-最大优化问题,并采用K-S函数对该问题的目标函数进行了拟合;通过耦合系统的1阶和2阶灵敏度方程,得到了K-S函数的解析敏度,并利用MATLAB的优化工具箱实现了对车辆平稳性的优化。数值计算结果表明,该方法対峰值点的优化可达58.34%。

The pseudo excitation method and the symplectic mathematical method are used to establish the motion equation with low degree of freedom for the vehicle-rail coupling system under the pseudo harmonic excitation;On the basis of the ISO 2631-1-1997international standard,the minimum-maximum optimization,with the ride comfort as the index, with the parameters of the vehicle suspension device as the design variants,is given,and the K-Sfunction is used to fit the objective function;Via the first order and second order sensitivity equation of the coupling system,the analylic sensitivity of the K-Sfunction is obtained,and the optimization of vehicle ride comfort is realized with the MATLAB optimization tool.The digital calculation result shows that the optimization of the peak point with the method can reach 58.34%.