高速列车车体模态贡献量对振动的影响分析  

Analysis of Impact of Modal Contribution Factors of High-speed Train Body on Vibration

作　　者：贺小龙[1] 张立民[1] 鲁连涛[1] 邱飞力[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室,四川成都610031

出　　处：《铁道学报》2017年第12期16-22,共7页Journal of the China Railway Society

摘　　要：为找出高速列车车体主要模态对车辆振动的影响规律,引入BGCI向量法对车体模态贡献量进行计算。建立某高速列车刚柔耦合模型,采用随机子空间法对车辆工作模态参数进行识别,通过模态置信判据MAC对主要模态进行判定,计算在不同运行速度下车体的模态贡献量。结果表明,车体刚体模态贡献量随列车运行速度增加逐渐减小,当列车运行速度低于120km/h时,车辆刚体模态贡献量大于弹性模态,速度高于120km/h时反之。当列车速度大于80km/h时,车体的菱形模态、垂向弯曲模态、扭转模态对车体振动贡献值逐渐增大(最大为0.035m/s2),弹性模态对振动贡献量明显增加。本文研究的模态贡献量与车辆振动关系可以为车辆振动控制提供理论支撑。In order to figure out the relationship between the main modal of high-speed train body and vehicle vibration,the BGCI vector method was used for the modal contribution calculation.The rigid flexible coupling dynamic car-body model was established and the vehicle operating modal parameters were identified by using thestochastic subspace method.Finally,the main modal was determined by modal confidence criterion（MAC）to calculate the modal contribution of the car body under different running speeds.The results show that the MCF of rigid mode decreases with speed increase.At speeds under 120 km/h,the MCF of rigid mode is greater than that of the flexible mode,and vice versa at speeds over 120 km/h.At the speeds greater than 80 km/h,the contribution of the vertical bending mode,rhombus mode and torsion mode of the car body to the car body vibration gradually increases（amax=0.035 m/s2）and the contribution of the flexible mode to the vibration significantly increases.The relationship between the modal contribution and the vehicle vibration can provide theoretical support for vehicle vibration control.

关 键 词：模态贡献量 模态贡献值 动力学模型 BGCI向量法 

分 类 号：U270.3[机械工程—车辆工程]