Research On Prediction Of Sound Field Of High-speed Railway Station Waiting Hall And Noise Reduction

With the continuous progress of science and technology and the fast developmentof high-speed railway construction, the vibration and noise problem caused byhigh-speed elevated station is getting more and more attention of people. High-speedelevated station waiting hall has large, complex sound field characteristics and largeacoustic frequency range. Domestic and foreign research on the acoustic fieldcharacteristics is rare. In this paper, the combination of finite element, boundaryelement and statistical energy analysis method are used to predict the acoustic fieldinside the waiting hall, then the acoustic effect factors were analyzed, finally thecharacteristics of different noise reduction method were studied to provide guidance tonoise reduction of waiting hall.In this paper numerical method acoustic field prediction was studied. The boundaryelement equation of the sound field of the waiting hall is deduced. Method ofcalculating three parameters of SEA is given. The frequency band of two calculationmethods is divided by calculation the modal density of main subsystems. The soundfield of full frequency prediction method is proposed.The finite element model and boundary element model of the waiting hall isestablished. The structure modal and the acoustic modal are calculated to analyze thesound-solid coupling characteristics of the waiting hall. The sound field distribution andthe curve of sound pressure at field point of the waiting hall of20~200Hz are computedbased on the boundary element method. The statistical energy analysis model of waitinghall is established to compute the sound cavity sound pressure curve of200~2000Hz.The results are compared with the test results in other paper to validate the accuracy ofthe modal.The relationship between the sound cavity surface vibration speed and field pointsound pressure is analyzed by the acoustic transfer vector analysis, it is the basis of thepanel acoustic contribution analysis (PACA). The PACA is done to find the panel of thewaiting hall which contributed the sound pressure much to the field point to ensure themain contribution panel. Based on noise transfer path analysis, the main noise transferof field path is found. Combined with modal participation factor the structure modalcontributed much is ensured. The main factors that influence the noise contribution arefound out by the modal vibration mode analysis. The statistical energy analysis is usedto analyze the panel construction of the subsystems of the waiting hall and find the maintransfer path at high frequency. It provides guidance for further noise reduction analysis.According to the main noise contribution areas, the noise reduction effect atdifferent frequency band of different noise reduction methods such as sound absorption, sound insulation, damping and structure control are compared, this provides theguidance for comprehensive noise reduction of the waiting hall.