车轮磨耗下车下悬吊系统振动特性研究

为研究高速动车组车下悬吊系统在车轮磨耗下的振动特性演变规律,建立考虑车体弹性振动和车下悬吊设备的刚柔耦合动力学模型,分析一个镟轮周期内车轮磨耗对车体和车下悬吊设备振动响应的影响。研究结果表明:车轮磨耗主要影响车下悬吊系统的横向振动,对垂向振动影响较小;在前5万km运营里程下,车体和车下设备的振动特性基本保持不变,随着里程的增加,车体和悬吊设备的振动特性不断恶化,当运营里程达到19.1万km时,车体和悬吊设备的振动加速度幅值达到了新轮下的2倍;车辆运行速度不高于140 km/h时,车轮磨耗对车体和设备的振动影响甚微,随着速度的增加,车轮磨耗对车体和悬吊设备的影响逐渐增大;通过选取合理的横向悬吊刚度可以有效抑制车轮磨耗对悬吊系统的影响,其取值范围在0.7~1.5 MN/m内比较合适。

Study on Vibration Behavior of Carbody Underneath Suspended Systems under Wheel Profile Wear

To study the evolution rule of carbody underneath suspended system vibration behavior under wheel wear, a rigid-flexible coupling dynamic model of high-speed EMUs is established considering the carbody elastic vibration. The influence of profile wear on vibration characteristic of carbody and its suspended equipment during one re-profile period is analyzed. The results show that wheel wear mainly effects of the lateral vibration of suspended system and has little influence on virtual vibration. The vibration of carbody and suspended equipment changes little during the first 50 thousand kilometers. With the growth of the railway running mileage, the vibration characteristics of carbody and suspended equipment continue deteriorates. At the point of 191 thousand kilometers, the acceleration amplitude can be twice of the new car. When the speed is less than 140 km/h, the wheel wear has little influence on vibration of the suspended system, and the influence increases with the speed raising. The influence of wheel profile wear on suspended system can be restrained by choosing a reasonable lateral suspended parameter and the range of the suitable lateral stiffness can be 0.7-1.5 MN/m.