Dept. of Elec. Eng. and Dept. of Telematics Eng., Natl. Fisheries Univ. of Pusan, Pusan, Korea 608-737
There is a need to develop a wideband underwater sound source. This need can be accomplished by an array of different resonance frequencies of transducers. An axisymmetric array transducer, which consists of three different size piezoelectric cylinder elements, is designed and its coupled electrical, mechanical, and acoustical characteristics are evaluated using the combined single code finite element method and hybrid-type infinite element method. The numerical result of electrical input impedance is consistent with the measurement result using an impedance analyzer and is shown to be better than that by Warren P. Mason's equivalent circuit modeling method. Its bandwidth and directivity pattern are also obtained and its limits as underwater sound projector are discussed.