Numerical Simulation of the Vibration and Structure-Borne Noise of the Viaduct

摘要

Based on the combination of finite element software ANSYS and acoustics software LMS Virtual.Lab Acoustics, this paper makes an analysis of the Vibration and sound radiation of the viaduct of urban rail transit.First of all, transient dynamic analysis of three-dimensional model of box girder was made in ANSYS, with train passing bridge simulated as a moving load or a moving mass-spring system.Then vibration displacement response obtained is taken as boundary condition of outer sound field, which can achieve accurate acoustic response in Virtual.Lab Acoustics.According to comparing the results of the two different models, we can draw that the noise pressure with the moving mass-spring system is higher than the other, and the noise pressure range is from 70 to 95 in decibels.Using the transient boundary element module of LMS Virtual.Lab Acoustics can solve engineering problems in time domain, with simulating the vibration properly.