SOUND RADIATION BY A CYLINDRICAL PIEZOELASTIC SHELL WITH AN ASYMMETRIC INSERTION

An acoustic system, defined as a liquid-filled piezoceramic shell with an asymmetric internal insertion, is considered. The mathematical mod el is formulated. The problem of sound radiation by such a system is s olved using the partial domains method. The acoustic characteristics o f the system for a number of insertions with different configurations and acoustic characteristics of surfaces are studied extensively. The analysis of the obtained quantitative data allows the following conclu sions When exciting the piezoceramic shell in the zero (pulse) mode, r edistribution of energy among various circumferential modes of vibrati on of the shell occurs through the asymmetric disposition of the inser tions. This fact sets up the conditions for the occurrence of specific low-frequency resonances of the system, absent in the eigenfrequency spectrum of the shell in vacuum. (C) 1996 Acoustical Society of Americ a.