Measurement and Analysis of Wheel-Rail Noise in Long-Span Bridges of Urban Rail Transit Systems
This study investigates the wheel-rail noise characteristics of urban rail trains passing through long-span bridges,focusing on the Dongshuimen Bridge of the Chongqing Rail Transit Line 6 and the Chaotianmen Bridge of the Chongqing Rail Transit Loop Line.Noise measurement data were collected for trains passing over the bridges.This study analyzed and compared the spectral characteristics of noise,summarizing the relevant patterns.The results indicate that the wheel-rail noise generated by rail trains on large-span bridges exhibits a wide-frequency characteristic,with the sound pressure level spectrum curve showing a"high in the middle,low on both sides"pattern.The noise peak of steel truss arch bridges is concentrated at approximately 800 Hz,and the structural noise generates a relative peak in the range of 63-80 Hz.In contrast,the noise peak of the steel truss girder cable-stayed bridges is in a higher frequency range.The three-span continuous steel truss suspension arch bridge exhibits a wide and high-amplitude noise spectrum,with its noise being significantly greater than that of the steel truss girder cable-stayed bridge,particularly in the mid-to high-frequency range of wheel-rail noise.
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