Acoustic Characteristics and the Design of Two-Layered Cylindrical Shells

Abstract

This paper is concerned with a study of the acoustic characteristics of two-layered cylindrical shells. A theoretical treatment of sound transmission through the shell wall is given for plane acoustic waves travelling within the shell. Each layer of the shell is assumed to bend according to the thick-shell theory. Sound transmission loss TL is calculated for various combinations of the two layers with different physical properties. Further, the acoustic design method of the shell with high transmission loss is presented and illustrated with some examples.