Analysis of Influencing Factors and Noise Re-duction Effects of Viaduct Noise in City Rail Transit
[Objective]It is aimed to provide advice for via-duct noise control in city rail transit and application of noise re-duction measures.[Method]Based on theories of vehicle-track dynamics,wheel-rail vibration radiation,and viaduct structure vibration radiation,a prediction model for viaduct noise in city rail transit is established.The influence of factors such as train speed,distance from viaduct structure,viaduct type,and noise barriers on city rail transit viaduct noise is ana-lyzed.[Result & Conclusion]When train speed exceeds 100 km/h,the viaduct noise increases by 1.8-5.5 dB(A)com-pared to train speeds below 100km/h.For single-cell single-box girders,single-cell double-box girders,and U-shaped gird-ers,the peak frequency range of viaduct noise is 50-80 Hz,with a peak frequency at 63 Hz.At a distance of 7.5 m from the track centerline,the single-cell double-box girder demon-strates the lowest noise levels at all heights,whereas noise lev-els at the girder sides of single-cell single-box girders and U-shaped girders are higher by 1.0-4.1 dB(A)and 5.2-10.6 dB(A),respectively,compared to single-cell double-box gird-ers.Near-track noise barriers with heights of 0.90 m or more above the track surface ensure a noise reduction effect of 7.0 dB(A)at 500 Hz frequency band,with noticeable noise reduc-tion effects maintained across frequencies above 630 Hz.
city rail transitviaductwheel-rail noisenoise reductionnear-rail noise barrier
万方数据
维普
