SOUND RADIATION FROM A FINITE FLUID-FILLED/SUBMERGED CYLINDRICAL SHELL WITH POROUS MATERIAL SANDWICH

A theoretical model is developed to predict the far field sound radiation from a finite fluid-filled/submerged cylindrical thin shell with porous material sandwich. A combination of the wave-number domain approach and the transfer matrix method is presented, which is convenient to analyze the vibratory responses in terms of wave number. Expressions for the spectral radial velocity of the outer surface of the shell are also formulated. A prediction model for sound radiation at far field is given by using the boundary integral equation. Extensive numerical results are also presented to illustrate the general characteristics of the far field sound pressure as a function of frequency. An experimental verification is performed, and a good correlation between the theoretical results and the experimental results shows that the theoretical study work in this paper is correct.