Analysis of Vibration Test of Over-track Buildings in Different Areas of Depots
In order to study the vibration of the over-track buildings caused by metro train operation in different areas of the depot,the field tests of the testing line,throat area,maintenance line and its over-track buildings in a depot in Guangzhou are performed.The transmission characteristics of vehicle induced vibration in each section of the depot are analyzed by means of Fourier transform and transmission loss.The analysis results show that the dominant frequency of strong vibration of trackside source increases with the increase of vehicle speed.The dominant frequencies of 15 km/h in throat area,40 km/h in testing line and 60 km/h in testing line are 31.5,40 and 50 Hz respectively,and the vibration energy of source intensity of the testing line is greater than that of throat area.Due to the impedance of the beam and floor,the total vibration energy gradually attenuates in the process of upward propagation.Different transmission paths have different attenuation effects on different frequency bands.The main frequency of vibration in the building is mainly affected by the natural frequency of the floor,and concentrated in the range of 40-50 Hz.
vibration and wavemetro depotover-track buildingvibration transmission lawtesting linethroat area
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