基于COMSOL的多层空腔声学覆盖层吸声性能分析

打开文本图片集

中图分类号：TB53 文献标志码：A

Abstract： To investigate the impact of multi-layer cavity structures on the sound absorption performance of acoustic coatings，this study employs the transfer matrix method and numerical simulations.By applying periodic boundaryconditions to focus onaunit cella simulation model is established using thefinite element method.The numerical model is validated based on theequivalent layered theoryand the transfer matrix method.The influence patterns of cylindrical cavities with diferent dimensions and multi-layer cavity structures on sound absorption performance across various frequency bands are analyzed.Research indicates that the radius of the cylindrical cavity significantly affects the sound absorption performance. Increasing the number of cavity layers can effctively broaden the sound absorption frequency band and enhance the sound absorption coeficient，with the four-layer structure demonstrating particularly notable advantages in the medium to high-frequency range.This study can provide a theoretical basis for the internal cavity design of acoustic coatings.

Key words：multi-layer cavity structure; finite element method;sound absorption variation；hull noise reduction; sound-absorbing structures

1 引言

在船体降噪领域，声学覆盖层是一种吸声效果显著的结构，其核心作用是包裹壳体，通过抑制壳体振动、吸收主动声呐发出的信号，降低船体对声波的反射强度，从而减少被探测到的可能性[-3]。（剩余3107字）