A TRANSFER MATRIX APPROACH FOR ACOUSTIC ANALYSIS OF A MULTILAYERED ACTIVE ACOUSTIC COATING

A transfer matrix approach is presented to evaluate and analyze the acoustic characteristics of a multilayered active acoustic coating, which can be applied to actively reduce sound reflection and/or transmission upon a given sound wave excitation. Expressions are derived to obtain the reflection and transmission coefficients, and to separate the incident sound pressure with reflected sound pressure from two integrated piezoelectric sensor layers. Numerical results for reflection and transmission coefficients of three cases are presented to verify the approach and to depict its effectiveness in the field of study and simulation of a multilayered active acoustic coating with a backing plate.