Analysis of Vibration and Secondary Noise Characteristics of Over-Track Building in Double-Deck Depot

In order to study the propagation law of vibration along the over-track building and the secondary structure noise problem caused by the operation of subway in double-deck depot,the field test of the throat sec- tion and the over-track building of Hengang double-deck depot is introduced. Fourier transform,transfer loss and 1/3 octave band spectrum are used to study the characteristics of vibration source. On this basis,the rela- tionship between structural vibration and indoor secondary structural noise is analyzed by constructing linear fit- ting function and cross power spectral density function. It is pointed that,due to the rapid attenuation of high-frequency vibration through soil,in the frequency band above 80 Hz,the vibration acceleration level of the first floor load-bearing column in the depot is less than that of the second floor load-bearing column;when the vibra- tion is transmitted to the top floor along the building,the superposition of the incident wave and the reflected wave makes the vibration energy of the top floor increase;the main frequency of the noise pressure of the sec- ondary structure in the building is within100 Hz,and the peak value appears near 40 Hz,and the frequency band of sound easily excited in buildings is estimated to be 40~60 Hz;the contribution of floor vibration radiation noise to indoor secondary structure noise is mainly around 40 Hz. In summary,it is recommended to focus on the response of vibration transmission along the upper building at 40 Hz. © 2023 Nanjing University of Aeronautics an Astronautics. All rights reserved.