Numerical Analysis and Experimental Study of Particle Dampers for Vibration Reduction of EMU End Wall Structures

doi:10.3969/j.issn.1004-132X.2021.04.014

Abstract

Abstract: The vibration and radiation noise of EMU end wall structures affected the ride comfort and the train stability during high-speed operation, and even caused structural fatigue failure. For the abnormal vibration problems of end wall structures at 40 Hz excitation frequency, a vibration reduction method for end walls was proposed based on particle damping technology. A discrete element model of the end wall particle dampers was established. The layout schemes and layer numbers were optimized according to the energy dissipation of the particle systems. And experiments were performed to analyse the acceleration responses of the end walls of each vibration-absorbing scheme. The experimental data indicate that the vibration reduction rate of the end walls in the main vibration direction may reach more than 80% at 40 Hz excitation frequency after the installation of particle dampers. The validity of the theory and simulation model was verified by experiments.

Key words: electric multiple units(EMU), particle damper, end wall, discrete element method, vibration reduction

摘要： 动车组车体端墙的振动及其带来的辐射噪声会直接影响动车乘坐的舒适性以及列车高速运行时的平稳性，甚至造成结构疲劳失效。针对端墙结构在40 Hz激励频率处异常振动的问题，提出一种基于粒子阻尼技术的端墙减振方法。建立端墙粒子阻尼器的离散元模型，并根据粒子系统耗能大小，对阻尼器布置方案和分层数进行优化，通过实验分析了各减振方案下端墙的加速度响应。实验数据表明，安装粒子阻尼器后，端墙在40 Hz激励频率处主振方向的减振率可达80%以上，该结果也验证了理论和仿真模型的正确性。

关键词: 动车组, 粒子阻尼器, 端墙, 离散元法, 减振

CLC Number:

U266

XIAO Wangqiang, YE Shuzhen, WANG Xingming, JIA Shangshuai, PAN Dekuo, LU Dajun, .

Numerical Analysis and Experimental Study of Particle Dampers for Vibration Reduction of EMU End Wall Structures

[J]. China Mechanical Engineering, DOI: 10.3969/j.issn.1004-132X.2021.04.014.

肖望强, 叶淑祯, 王兴民, 贾尚帅, 潘德阔, 卢大军, . [设计与优化]动车组车体端墙粒子阻尼器减振的数值分析与实验研究[J]. 中国机械工程, DOI: 10.3969/j.issn.1004-132X.2021.04.014.

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