Prediction and propagation characteristics of structure-borne noise of an underground platform in rail transit

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (8) : 278-285.

ZENG Qin’e, GAO Liang, HOU Bowen, MA Chaozhi

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Abstract

In this paper, noise field tests were carried out in an underground station platform. And a suitable finite element model was established to analyze structure-borne noise induced by the load of a rail transit train through the refined simulation of the station structure. The sound field distribution characteristics of low-frequency structure-borne noise in the station platform space were analyzed. At the same time, acoustic mode was used to reveal the propagation mechanism of low-frequency noise in the station platform. The analysis results indicate that: the low frequency noise in the underground station platform appears an obvious peak at 50 Hz-85 Hz, which is radiated mainly from the vibration of the platform board. The sound pressure level at different locations shows a significant volatility with a fluctuation of 12 dB, and the sound pressure level varies within 68.6 dB-80.4 dB. The sensitive resonant frequency of the platform acoustic cavity has a significant impact on low-frequency structural noise, which will amplify the low-frequency structural noise of the station. Changing the height of station platform is a useful method to improve the station sound environment.

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rail transit / platform / low-frequency noise / acoustic mode / sound field distribution

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ZENG Qin’e, GAO Liang, HOU Bowen, MA Chaozhi. Prediction and propagation characteristics of structure-borne noise of an underground platform in rail transit[J]. Journal of Vibration and Shock, 2021, 40(8): 278-285

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