Research Of Structure-Borne Noise Of32m Simple Supported Box Girder In High-Speed Railway

Since the first high-speed railway come into being in Japan in1964, there have been three main waves in the history of the development of high-speed railway worldwide. Among all nations in the world, Japan, French, Italy and Germany’s are the most representation for the history of the high-speed railway. High-speed railway construction starts in China later, but we have a high staring point and fast development. Our high-speed railway has its own independent intellectual property rights, so far high-speed railway construction has stepped into a peak stage in China. With the high-speed railway’s developing, the vibration and noise of high-speed railway bridge’s structure draw ever more attention from social public.This paper analyzes the limit value and evaluation criteria of the low frequency noise at home and abroad. This result provides a scientific basis and references for implement evaluation criteria on vibration and noise of the high-speed railway in china. There are few study focus on the low frequency noise of the bridge structure, this paper is devoted to the study of theoretical analyses and numerical computation of radiation noise. The acoustic BEM we used includes the method of frequency domain analysis and time domain analysis, which has irreplaceable advantages.The calculation of vibration and noise is based on FEM-BEM theory, and two kinds of simplified load model——moving load model and moving mass model, which are the models of typical32m simple girder. The paper firstly analyzes the vibration and radiation noise of bridge, then analyzes this two factors in time domain and frequency domain, finally get the relation between vibration and noise, and the regularity of their transmission and attenuation. Dynamic analysis of bridge is calculated by ANSYS, while radiation noise is calculated by the transient acoustic BEM module of Virtual.Lab Acoustics. The author analyzes the variation of vibration and radiation noise caused by bridges and vehicles through changing their parameters, which provides a theoretical basis for vibration and noise reduction in the engineering practice.