The Influence Of Audio-visual Factors On Traffic Noise Perception In Urban Open Space

Urban open space refers to urban public external space,covering natural scenery,square,road,leisure space and public green space.With the improvement of residents' economic living standards and the improvement of urban road system,urban open space has become an indispensable part of modern urban life,and people's requirements for the quality of sound environment in urban open space are also increasing day by day.Although the research on traffic noise in urban open space is more and more comprehensive and in-depth,there is little research on the influence of audio-visual interaction on traffic noise perception.Therefore,this paper studies the influence mechanism of acoustic factors and audio-visual interaction on traffic noise perception by means of field investigation,objective measurement,questionnaire survey and laboratory simulation.This study is of great significance to improve the quality of urban spatial acoustic environment,and can also provide a theoretical basis for the design of urban open space acoustic environment.In this paper,four typical urban open spaces are selected as the object of investigation,and the research area and time are further determined according to the characteristics of landscape environment and acoustic environment.Then the reasonable measuring instruments are selected to measure the environmental sound level and about 40 people are investigated by questionnaire,and then the influence mechanism of audio-visual factors on traffic noise perception in urban open space is summarized.In the aspect of the influence of acoustic factors on traffic noise perception in urban open space,taking music sound as an example,the increase of sound pressure level can effectively reduce the subjective loudness of traffic noise and improve the sound comfort.As far as the influence of natural sound is concerned,the degree of bird song improving the comfort of traffic noise is obviously higher than that of flowing water sound.When the sound environment becomes more complex,the masking effect of music sound on traffic noise is the strongest,the masking effect of mechanical sound on traffic noise is the weakest,and the perception evaluation of traffic noise sound environment has little effect.In terms of the influence of audio-visual interaction on traffic noise perception in urban open space,as far as the interaction between landscape and sound source is concerned,Water can reduce people's evaluation of traffic noise comfort,while greening will improve people's sound comfort evaluation.In terms of crowd visual factors,in the range of 0.02-0.20 people/m~2,the crowd density is 0.14 people/m~2,the traffic noise has the highest acoustic comfort,the subjective loudness of traffic noise is the highest when the population density is 0.02 people/m~2,and the sound comfort is the lowest when the population density is 0.20 people/m~2.As far as the interaction between green visual rate and sound source is concerned,when the green visual rate reaches moderate(30% ? 60%),the sound comfort of traffic noise is the highest.To sum up,this paper explores the influence mechanism of acoustic and audio-visual interaction on traffic noise perception through scientific experimental methods,in order to provide theoretical support for the design of acoustic environment in urban open space and help to improve the acoustic environment in urban open space.