Study on Noise Reduction Mechanism of Acoustic Reflection Grooves

Abstract

This paper studies a continuous reflex arc structure with silencing function, the principle of mutual interference between reflected sound waves and incoming sound waves is used to reduce noise. The normal direction of each reflex arc points to the direction of the incident sound source, which can maximize the reflection efficiency. The normal direction of reflex arc is determined by the position parameters, frequency spectrum and fundamental frequency of the incident sound source, it is ensure that the reflected sound waves are in the opposite direction to the incident waves. The depth, width and normal direction of the reflex arc are determined by calculating the position parameters of the sound source and the material of the wall plate. The arrangement and spacing of the reflex arc are optimized by establishing mathematical model, and then optimized by repeated experiments. Finally, the reflex arc structure with the maximum noise reduction can be obtained. The paper have carried out the theoretical calculation and computer simulation of the reflex arc structure and the feasibility of the scheme has been verified theoretically.