Influence of Short Wave Irregularity on Elastic Vibration Characteristics of ATP Antenna Beam of High-speed EMU

doi:10.3901/JME.2023.16.223

Abstract

Abstract: ATP antenna beam is one of the important components located on the bogie of EMU, which has obvious elastic vibration during the operation of EMU. The rigid-flexible coupling dynamic model is established, and the operational modal frequency of the antenna beam is obtained by applying sweep excitation. The excitation superimposed with short-wave irregularity is used as the input,and the vibration responses of the antenna beam under different excitation parameters and different operating speeds are obtained by numerical simulation method. The influence of the above factors on the elastic vibration of the antenna beam is analyzed from the time domain, frequency domain, RMS value of stress and stress spectrum, and the reason for the elastic vibration of the antenna beam is revealed. When the excitation frequency formed by the short-wave wavelength and the speed of the train is close to the operational modal frequency of the antenna beam, its elastic vibration will be intensified. The stress value at the T4 position increases linearly with the depth of the short-wave irregularity, and the number of high-amplitude stress in the stress spectrum increases significantly.By adjusting the running speed of the vehicle to avoid the sensitive frequencies of the antenna beam, the elastic vibration of the antenna beam can be significantly reduced. The research results of this paper have certain reference significance for revealing the mechanism of elastic vibration of ATP antenna beam of high-speed EMU and putting forward the method of restraining elastic vibration of antenna beam.

Key words: ATP antenna beam, rigid-flexible coupling, short wave irregularity, elastic vibration, operational modal

CLC Number:

U270

WEI Xue, REN Zunsong, CAO Jie, WU Yangmin. Influence of Short Wave Irregularity on Elastic Vibration Characteristics of ATP Antenna Beam of High-speed EMU[J]. Journal of Mechanical Engineering, 2023, 59(16): 223-232.

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