According to the field test based on some high-speed railway vehicles , the unbalanced vibration of carbody underneath suspended system with rotational equipment is the main cause of local abnormal vibration of the carbody . To study the coupled vibration of unbalanced vibration of rotational equipment and carbody , the motion equation of unbalanced vibration of underneath rotational equipment and vertical coupled vibration of e-lastic carbody was firstly derived , describing the motion characteristics of carbody elastic vibration and active rotational equipment .Besides ,a 3D rigid-flexible coupling multibody dynamic model of railway vehicle was set up , analyzing the influence of unbalanced vibration of underneath rotational equipment on carbody vibration . The results showed that there was a difference between elastic and rigid connection within the underneath sus-pended system . The increased unbalanced vibration highlighted the advantage of the elastic connection . The increased unbalance mass of rotational equipment intensified the local vibration of the carbody and expanded the abnormal vibration range of the car body . The analysis on the two measures proposed in this paper for carbody vibration-reduction showed that reasonable suspension parameters can reduce carbody elastic vibration and the measures are easy for implementation . However , the actual reduction effect was limited because of the rubber spring manufacturing technology . What's more , multi-stage vibration isolation system can effectively reduce the carbody vibration , but the system structure is more complex and suspension parameters of each stage need to be properly designed .%在高速动车组的线路测试中发现,车下旋转设备的不均衡振动是造成其上方车体地板局部异常振动的主要原因.为研究车下旋转设备与车体耦合振动关系,推导出车下悬吊设备不均衡振动与弹性车体垂向耦合振动的运动方程,描述车体弹性振动与有源旋转设备的位移特性.建立三维车辆刚柔耦合动力学仿真模型,分析车下悬吊设备不均衡振动对车体振动的影响.研究结果表明,有源设备采用弹性和刚性悬挂方式差异明显,弹性悬挂方式的优势随着不均衡振动的加剧逐渐突出;旋转设备不均衡量的增大加剧了车体局部振动,而且会扩大车体异常振动范围.对于本文提出的两种车体减振措施,分析结果表明,合理的悬挂参数可以降低车体的弹性振动,减振措施便于实施,但是实际减振效果受到橡胶弹簧制造技术限制;采用多级悬挂参数可以有效降低车体弹性振动,但是系统结构更加复杂,每级系统的悬挂参数均需要合理设计.
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