Vibration source mechanism and frequency characteristics of underground lines of urban rail transits

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (4) : 171-178.

YANG Yiqian1,LIU Penghui1,FANG Bin2,DONG Zhensheng1,ZHANG Hongliang3

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Abstract

Based on the measured data of the vibration source of 35 sections of the 24 urban rail transit underground lines. The excitation mechanism and frequency characteristics are discussed; the vibration data of the rail, track bed, and tunnel wall are used to identify the un-sprung mass of the vehicle and the P2 resonance frequency of the track coupling system , The stiffness of the fastener is deduced. The first natural frequency and Pined-Pined resonance frequency of the track system are analyzed based on the data of hammer impact test, and the stiffness of the fastener is deduced. It is proposed that the P2 resonance of the vehicle un-sprung mass and the track coupling system and wheel wear excitation frequency is one of the main excitation sources of urban rail transit environmental vibration and indoor secondary structure noise. The increase in stiffness of the fastener pad after aging increases the P2 resonance frequency. The contribution of noise is more significant than the contribution to environmental vibration. Pined-Pined resonance and wheel-rail roughness are the main excitation sources of urban rail transit environmental noise and interior noise.

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Urban rail transit / subway / underground lines / vibration source / frequency characteristics

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YANG Yiqian1,LIU Penghui1,FANG Bin2,DONG Zhensheng1,ZHANG Hongliang3. Vibration source mechanism and frequency characteristics of underground lines of urban rail transits[J]. Journal of Vibration and Shock, 2023, 42(4): 171-178

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