桥建分离高铁车站噪声声场特性实测与分析OA

This study investigated the noise characteristics of high-speed railway(HSR)stations with bridge-station separation,addressing the issue of excessive noise levels on platforms during train pass by,based on the relevant standards.The research focused on a newly constructed bridge-station-separated HSR station in a major Chinese city.Noise measurements were conducted under various operational conditions during train pass by.A noise prediction model for the station was developed based on periodic structural theory and the 2.5D(two-and-a-half-dimensional)acoustic boundary element method,and was validated against field measurements.The study examined the noise characteristics under different conditions,analyzed the sound field characteristics of bridge-station-separated HSR stations,and proposed several noise reduction strategies,which were compared to identify the most effective solution.The results show that the pass-by exposure sound level at platform monitoring point No.1 can exceed 105 dBA when trains pass different tracks at high speed(recommended values that do not meet the relevant standards).The sound levels inside the station building(without passengers)can range from 66 to 67 dBA.Wheel-rail noise is identified as the dominant noise source.The predictive model can accurately simulate mid-to-high frequency noise and further investigates the spatial distribution of platform noise.The simulations can reveal that installing metallic platform screen doors is the most effective noise mitigation measure,reducing platform noise by 12.2 dBA and indoor noise by 7.5 dBA.The findings can provide valuable reference for noise prediction,passenger comfort evaluation,and noise control design for similar bridge-station-separated HSR stations.