| 高速动车组柔性转向架蛇行运动频谱分析 |
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| 引用本文： | 干锋,戴焕云,罗光兵,杨震寰,李涛.高速动车组柔性转向架蛇行运动频谱分析[J].交通运输工程学报,2022,22(1):155-167. |
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| 作者姓名： | 干锋 戴焕云 罗光兵 杨震寰 李涛 |
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| 作者单位： | 西南交通大学 牵引动力国家重点实验室，四川 成都 610031 |
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| 基金项目： | 牵引动力国家重点实验室自主课题;国家自然科学基金 |
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| 摘 要： | 为分析高速动车组在不同运行速度下的转向架蛇行运动频谱，推导了自由轮对蛇行运动模型，建立了与纵向、横向速度和摇头角速度相关的3个一阶微分方程；建立了柔性转向架蛇行运动模型，给出了与轮对和构架的横移和摇头自由度相关的9自由度蛇行运动方程；结合车辆悬挂和实测轮轨接触关系等参数，联立自由轮对蛇行运动方程，求解不同轮对初始横移下的构架蛇行波长和频率；以某型动车组一个车轮镟修周期内实测的车轮踏面廓形为例，分析不同车轮镟后里程下的构架蛇行波长及频率的变化规律。分析结果表明:部分测点出现明显的2.9、14.9和33.6Hz振动频率，且这些频率随着车速的增加呈线性增长趋势；33.6 Hz来源于车辆通过CRTS Ⅱ型轨道板时频率；14.9 Hz来源于350 km·h-1运行时的车轮转动频率；当轮对初始横移为3 mm的等效锥度为0.14时计算的构架蛇行频率为3.0 Hz，与实测构架横向振动频率2.9 Hz接近，从而验证了微分方程的准确性；随着车轮镟后里程的增加，相同轮对横移下的等效锥度不断增大，构架蛇行波长不断减小，蛇行频率也随之增高；车轮镟修后20.6万公里，轮对横移1 mm时蛇行频率最大接近8 Hz。
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| 关 键 词： | 车辆工程 柔性转向架 蛇行运动 蛇行频率 等效锥度 构架稳定性 |
| 收稿时间： | 2021-08-21 |
Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs |
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| GAN Feng,DAI Huan-yun,LUO Guang-bing,YANG Zhen-huan,LI Tao.Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs[J].Journal of Traffic and Transportation Engineering,2022,22(1):155-167. |
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| Authors: | GAN Feng DAI Huan-yun LUO Guang-bing YANG Zhen-huan LI Tao |
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| Affiliation: | State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China |
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| Abstract: | In order to analyze the spectrum of bogie hunting motion of high-speed EMUs at different operating speeds, a free wheelset hunting motion model was deduced, and three first-order differential equations related to the longitudinal velocity, lateral velocity and yaw angular velocity were established. A hunting motion model of the flexible bogie was established, and a 9- degree of freedom hunting motion equation related to the degrees of freedom of lateral displacement and shaking-head of wheelset and frame was given. Combined with the parameters of vehicle suspension and the measured wheel-rail contact relationship, and together with the hunting motion equation of free wheelset, the hunting wavelengths and frequencies of frame under different initial lateral displacements of wheelset were solved. Taking the wheel tread profile measured in one wheel repair cycle of a certain type of EMUs as an example, the variation law of the frame hunting wavelengths and frequencies under different mileages after wheel repair were analyzed. Analysis results show that some measuring points have obvious vibration frequencies of 2.9, 14.9 and 33.6 Hz, and these frequencies increase linearly with the vehicle speed. 33.6 Hz comes from the frequency when the vehicle passes through the CRTS Ⅱ track plate; 14.9 Hz comes from the wheel rotation frequency when running at 350 km·h-1. When the initial lateral displacement of the wheelset is 3 mm and the equivalent conicity is 0.14, the calculated hunting frequency of the frame is 3.0 Hz, which is close to the measured lateral vibration frequency of the frame of 2.9 Hz. And then the accuracy of the differential equation is verified. With the increase of the mileage after the wheel repair, the equivalent conicity under the same wheelset lateral displacement continues to increase, the hunting wavelength of the frame continues to decrease, and the hunting frequency also increases. After 206 000 km after wheel repair, the maximum hunting frequency is close to 8 Hz when the wheelset lateral displacement is 1 mm. 1 tab, 18 figs, 32 refs. |
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