Analysis of Sound Insulation Mechanism and Optimization Design of an Acoustic Coating Layer with Multi-section Cylindrical Cavities

Abstract

Introducing the insulation layer is an effective way to reduce sound radiation from underwater structures. Impedance mismatch properties between water and layer is closely related to sound insulation performance. Finite element method with COMSOL is used to calculate sound insulation loss in this paper. In order to investigate the insulation mechanisms of coating layer embedded with multi-section cylindrical cavities, the coating layer is approximated to a homogeneous layer with equivalent material properties. The results show that acoustic coating layer with multi-section cylindrical cavities, which causes a higher impendence mismatch has a better sound insulation performance than cylindrical cavity acoustic coating layer of the same cavity volume. The coating layer with optimized multi-section cylindrical cavities structure has obvious sound insulation advantages in the range of 200Hz to 4000Hz. Finally the theoretical analysis is verified by experiments.