Experimental Research on Identification of Ground-borne Noise from Subway Lines Based on Partial Coherence Analysis

Abstract

The definition of how ground-borne noise is radiated into rooms in surrounding buildings due to underground subway lines is diverse in different countries, especially in the dominant frequency range. In the present paper, a set of field tests were carried out in Suzhou city, China to obtain ground vibration induced by subway vehicles and radiated noise in buildings. Preliminary analysis of frequency range is 1-300Hz based on the strength of frequency domain analysis of the ground-borne vibration and noise and attenuation of vibration along propagation path. Furthermore, the ground-borne noise is recognized from the measured data by partial coherence function. Based on this theory, the contributions of different vibration sources to the noise are distinguished. The analyzed result shows that the recognized dominant frequency range of the ground-borne noise is between 20∼310Hz. This research also indicates a difference of A-weighted sound levels between the tested result and contrasting criterions.