Soundproof Characteristics of Sandwich Cylindrical Shells With a Honeycomb Core Partially Exposed in Free Field

Abstract

An analysis is presented for the soundproof characteristics of sandwich cylindrical shells with honeycomb core excited by axially propagating internal plane acoustic waves. The shell is exposed in a free field by the length of l, however is otherwise covered with infinitely long rigid cylindrical walls. To simplify the shell equations, it is assumed that the core material resists only transverse shear forces and that the facings resist only bending moments. The sound transmission loss of the shell wall, TL, is derived and calculated numerically for various values of the physical parameters involved.