高速铁路桥梁支座刚度对车-桥耦合系统的影响

Influence of high-speed railway bridge bearing stiffness on vehicle-bridgecoupling system

作为高速铁路仿真的关键环节,对车一桥耦合系统的动态响应进行评估,依托支座刚度对系统指标的变化特性开展分析。研究结果显示:车辆系统中车体的垂向加速度与支座刚度相关性较高,而轮轨力、脱轨系数等安全性指标受支座刚度影响较小。桥梁系统中支座刚度与垂向位移相关性较大,桥梁中间区域的横向加速度与支座刚度呈负相关,而塔顶的横向振动量级与支座刚度呈正相关。柔性轮相比刚性轮对桥梁与车体的振动更为敏感,而与其他指标相关性较小。车一桥耦合系统精准确定了不同支座刚度下高速动车组各指标的变化特性,为后续产品的设计优化提供了参考。

As a key part of high-speed railway simulation,the dynamic response of the vehicle-bridge coupling system is evaluated,and the variation characteristics of the system index are analyzed based on the bearing stiffness.The results show that the vertical acceleration of the vehicle body in the vehicle system has a high correlation with the stiffness of the bearing,while the safety indexes such as wheel-rail force and derailment coefficient are less affected by the stiffness of the bearing.The bearing stiffness in the bridge system has a large correlation with the vertical displacement,the lateral acceleration in the middle area of the bridge is negatively correlated with the bearing stiffness,and the transverse vibration magnitude of the tower top is positively correlated with the bearing stiffness.Compared with rigid wheels,flexible wheels are more sensitive to the vibration of bridges and vehicle bodies,and have less correlation with other indicators.The vehicle-bridge coupling system accurately determines the variation characteristics of each index of high-speed EMUs under different bearing stiffnesses,which provides a reference for the design optimization of subsequent products.