In this research, the effect of rail vehicle carbody’s flexural modes on the ride comfort of an example high-speed railway vehicle is investigated. The vehicle is modeled as a rigid multi-body system, where the rigid body vertical, longitudinal, pitch, and roll degrees of freedom of the carbody and bogie frames and the rigid body vertical and roll degrees of freedom of the wheelsets are considered. An Euler–Bernoulli beam theory is used to account for the flexural motion of the carbody. The longitudinal interaction between carbody and bogie through the traction rod is modeled as a nonlinear spring element. The corresponding equations of motion of the system in the frequency domain are obtained by using the equivalent linearization method. The effect of the traction rod is explored by using this model. Also, the optimal stiffness of the traction rod element that minimizes the flexural vibrations of the carbody is obtained through a genetic algorithm. With the optimal stiffness for the traction rod, the ride quality index at the center of the carbody floor is improved by 41% at a speed of 300 km/h. For the validation of numerical results, a scaled model of the vehicle with a scale factor of 24.5 was constructed, and its associated results are presented. The model was excited by random input signals, which were generated based on the power spectral density of the track irregularity function. The agreement between the simulation results and the scaled experimental outcome when compared with the measured data from other sources is found to be satisfactory. In the framework of the physical scaled model, the filtering effect due to the vehicle bogie base is also examined.

在这项研究中，研究了铁路车辆车身的挠曲模式对示例高速铁路车辆的乘坐舒适性的影响。车辆被建模为刚性多体系统，其中考虑了车身和转向架框架的刚性垂直，纵向，俯仰和侧倾自由度以及轮对的刚性垂直和侧倾自由度。欧拉-伯努利梁理论用于说明车身的挠曲运动。车身和转向架之间通过牵引杆的纵向相互作用被建模为非线性弹簧元件。通过使用等效线性化方法，可以获得系统在频域中的相应运动方程。通过使用该模型来探索牵引杆的作用。也，通过遗传算法可以获得最小化车身弯曲振动的牵引杆元件的最佳刚度。凭借牵引杆的最佳刚度，在300 km / h的速度下，车身底板中央的行驶质量指数提高了41％。为了验证数值结果，构建了比例因子为24.5的车辆比例模型，并给出了相关结果。该模型由随机输入信号激励，该信号是根据磁道不规则函数的功率谱密度生成的。与其他来源的测量数据相比，仿真结果与按比例缩放的实验结果之间的一致性被认为是令人满意的。在物理比例模型的框架中，