Abstract:

This study takes the multi-layer mass transit of Gonghexin Road, Shanghai, as an example, which has a subway line with a doubledecker elevated track. Vibration and environmental noise caused by the urban mass transit was investigated. Noise measurement was done in the subway, on the ground and on the double-decker elevated track. Based on the date and their spectral decomposition, curves of one third octave characteristics and equivalent sound pressure levels were obtained. Further analyses were carried out on the rules of normal noise for different mass transits. The results are useful for the urban development, environmental evaluation and noise control.

Key words: noise theory; fast Fourier transform (FFT); data analysis; environmental evaluation