TAO Meng FAN Jun TANG Weilin

(School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University  Shanghai 200240)

Received Oct. 19, 2007

Revised Nov.5, 2007

Abstract The effect of multiple compliant layers on sound radiation from a finite cylindrical shell immersed in an infinite acoustic medium is studied. The transfer matrix is derived according to the continuous boundary conditions at each adjacent interface of the multi-layer system. With the shell theory and the acoustic wave equation, the theoretical model is developed to estimate the characteristic of sound radiation. The numerical calculation results show that the amount of the acoustic radiation power reduction increases as the wave speed or the density of the compliant layer decreases, and using multi-layer system could be more effective on noise reduction than the corresponding uniform single layer.

PACS numbers: 43.30, 43.40