Study On Traffic Noise Frequency Characteristics Of Urban Section And Noise Reduction Countermeasures

With the advancement of urbanization process and the rapidly development of the automobile industry,the resulting road traffic noise is becoming one of the main environmental problems that restrict the improvement of the quality of life of residents.Prevention and control of traffic noise along the road has currently become the most urgent problem to be solved by the city road,traffic,environment protection departments.It is imminent to improve the sound quality of the city along the road.How to control traffic noise and take effective noise reduction strategy has been the focus of attention of scholars.At present,the researches on traffic noise at home and abroad mainly focus on the sound source intensity of noise,and the research on noise frequency is less concerned.In the choice of noise reduction measures,it is only to control the intensity of road traffic noise,less consideration of the characteristics of noise frequency.Although people take a lot of measures to control traffic noise,but did not achieve the desired noise reduction effect.This paper aims to reducing the noise of road traffic effectively by studying the frequency characteristics of traffic noise and analyzing the sound source characteristics of noise comprehensively and deeply.By studying the composition of road traffic noise and the propagation mechanism of traffic noise,conducting a field study of representative sections of the main city in Harbin within the scope of different roads,starting from the traffic noise and frequency measurement,the paper analyzes the traffic noise and frequency characteristics of road sections and calculates the frequency gravity.The study shows that the urban road traffic noise is mainly low frequency.Among them,the frequency center of gravity of the ground straight road sections is the main frequency of 150H~250Hz,the elevated section is distributed in the middle frequency band of 250~350Hz,and the middle section of the tunnel is mainly distributed in the middle frequency range of 350~450Hz.On this basis,the main factors influencing the intensity and frequency of urban road traffic noise are analyzed,which provide the basis for the research of noise reduction countermeasures in the next step.By understanding the present situation of road traffic noise in Harbin and the irrationality of existing sound barrier,this paper puts forward the scientific noise reduction method of urban road section combined with the noise and frequency characteristics of typical road sections,and provides reference for urban road construction and traffic noise prevention.