High-speed Railway Environmental Noise Annoyance Study Based On Auto-correlation Function And Interaural Cross-correlation Function

The high-speed railway environmental noise has a great impact on the residents’ living condition along the railway.The research on high-speed railway noise started late in China,and the railway noise characteristics are not fully understood.In the past,the high-speed railway environmental noise has been evaluated according to sound pressure level(SPL)and its frequency characteristics.These indicators cannot reflect the spatial characteristics of the sound field,and the traditional single-channel measurement methods are not consistent with the real listening conditions of human.This thesis takes the Xiamen-Shenzhen Railway and the Wuhan-Guangzhou High-speed Railway as the research object,uses the multi-channel test system and the binaural microphone to collect the real sound source,and calculates ACF and IACF to obtain the physical parameters consistent with the subjective feelings of the human being,which may affect the subjective annoyance of high-speed railway environmental noise.These works may provide reference for improving the existing high-speed railway noise measurement and evaluation system.Firstly,SPL,attenuation law,spectrum characteristics and other characteristics of high-speed railway environmental noise were measured.ACF and IACF were calculated in Matlab,and a series of time and space physical parameters of high-speed railway noise such as Φ0,Φ1τ1,τe,IACC,τIACC,WIACC,LL were extracted.Models of train,far and near-track travel and speed have different effects on these physical parameters,so the ACF and IACF parameters can better describe the noise characteristics and contain much sound field information.Finally,the subjective annoyance judgments were carried out to obtain the annoyance of different high-speed railway noise samples,and the correlation analysis and image analysis of the extracted ACF and IACF physical parameters were carried out.The result shows that the annoyance increased with increasing value of speed,exposure sound level as well as Flu_τIACC,and the annoyance is stronger when Φ0,LLmax is higher,τ1 value is lower,and the spatial factors’fluctuation is bigger.