Structure-borne noise reduction for an infinite, elastic cylindrical shell

A theoretical model was developed to evaluate the reduction of structure-bo rne noise generated by an axially symmetric ring force which is applied on the interior of the cylindrical shell. The vibrating cylindrical shell is c oated with a microvoided elastomer that is acoustically soft material desig ned for the reduction of the generated noise. The analytical model is a two -layer shell structure comprised of a cylindrical shell and an outer layer (coating) that is perfectly bonded to the cylindrical shell. The outer and inner surfaces of the coated shell are in contact with water and air, respe ctively, The analysis for this problem is based on the theory of elasticity , acoustic wave equations, and pertinent boundary conditions. Effects of va rious parameters such as coating thickness and material properties on the n oise reductions are presented. (C) 2001 Acoustical Society of America.