Design and performance analysis of composite QRD rail transit sound barrier

The problem of low-frequency noise diffraction is a difficult problem that needs to be solved in the current design of sound barriers. With the application of number theory diffusers, the attempts using quadratic residue diffusers (QRD) in sound barriers have been suggested. However, due to the influence of the environment, its engineering applicability is not strong. Based on the acoustic propagation characteristics, combining the principle of number theory diffuser and considering the amount of materials used, a new type of sound barrier is proposed in this paper. By using Lms.virtrual.lab software and AML finite element method and considering acoustic-vibration coupling, it is verified that the noise reduction performance of applying the proposed sound barrier in rail transit is superior to applying diffuser composite T-barrier and traditional L-noise barrier, especially the effect at low frequencies is obvious. So, it has high engineering applicability and practical significance.