Research And Optimization Analysis Of Acoustic Characteristics Of Road Noise Barriers

Sound barriers are widely used in China,but the research on the actual effect,structure and materials of sound barriers is still insufficient,especially because the traffic noise is concentrated in low frequency bands,and the noise reduction effect of existing research on low frequency band Limited,there is the problem of actual noise reduction is not ideal.Therefore,it is of great market prospect and research significance to study the noise barrier structure parameters suitable for urban traffic in order to improve the noise reduction effect and reduce the noise pollution level.In this paper,the finite element simulation method is used to analyze the acoustic characteristics of different structural parameters of the sound barrier.For the sound absorption structure with triangular spikes applied to the side of the sound barrier,the simulation analysis model of sound barrier noise reduction and noise reduction was established and verified using COMSOL software with the method of finite element simulation.Taking the sound barrier with triangular diffuser on the surface as the research object,the effects of different structural parameters of the sound barrier(width,interval and angle of the sound diffuser)on the insertion loss were studied.The results show that for the sound barrier with triangular protrusions,the width and angle of the diffuser have a greater influence on the insertion loss,and the influence of the spacing parameter is not obvious.It was concluded that for the barrier structure with triangular sound diffuser on the surface,the noise reduction effect can be improved by increasing the width and angle of the triangle.For top spread application of acoustic noise barrier structure,to explore the influence of different structures and parameters for the insertion loss,and the groove bottom of the structure for the PRD to gain more additional impedance boundary impedance composite structure formation,calculation and analysis for the PRD to gain more impedance composite structure acoustic characteristics,found that the composite structure within the entire spectrum of noise reduction effect is improved significantly.At the same time,the sound pressure level was compared and analyzed when the sound barrier was built on one side and the other.The composite structure of PRD impedance combines sound absorption and diffusion,which has a broad prospect in the engineering application of sound barrier.