Prediction and analysis of vibration and structural noise of upper cover building of double-deck depot

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 304-311.

FENG Qingsong, YU Chao, TANG Baizan, ZHOU Tao

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Abstract

In order to study the vibration and indoor structural noise characteristics of the over-track building caused by the operation of metro in the double-deck depot, taking the over-track building property project of the first double-deck depot in China as the research object, the propagation law of vibration and radiated secondary structural noise of the over-track building in the double-deck depot is systematically analyzed by using the method of field measurement and numerical simulation. Based on the finite element model of earth-depot-over-track building, the vibration propagation characteristics of the over-track building under train load are calculated, and then the radiated noise and its characteristics of the indoor structure of the over-track building are analyzed by using the acoustic transfer vector method. Finally, the noise radiation contribution of indoor panels and the noise reduction effect of sound-absorbing plates are studied. The analysis results show that because the high-frequency vibration attenuates rapidly through the soil, at the frequency band above 80Hz, the ground floor vibration of over-track building caused by train operation on the second floor is significantly greater than that on the first floor; The vibration of the over-track building caused by the vibration caused by the train in the operation depot is attenuated to the lowest level on the 10th floor, and then the vibration is amplified with the continuous increase of the floor; At 40 Hz, the ceiling and floor contribute the most to the acoustics of the bedroom site, and the noise reduction effect is the most obvious when the sound-absorbing material is used on the top floor.

Key words

double-deck depot / propagation law / secondary structure noise / acoustic contribution analysis / sound absorption coefficient

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FENG Qingsong, YU Chao, TANG Baizan, ZHOU Tao. Prediction and analysis of vibration and structural noise of upper cover building of double-deck depot[J]. Journal of Vibration and Shock, 2023, 42(9): 304-311

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