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http://dx.doi.org/10.7776/ASK.2009.28.4.363

Equivalent Circuit Modeling of Multiple Modes Underwater Acoustic Piezoelectric Transducer Using Particle Swarm Optimization Algorithm  

Lee, Jeong-Min (국방과학연구소)
Lee, Byung-Hwa (국방과학연구소)
Baek, Kwang-Ryul (부산대학교 전자.전기공학부)
Abstract
In this paper, an estimation method is presented to determine the equivalent circuit model of an underwater acoustic piezoelectric transducer with multiple resonant modes. A fitness function that includes the coupled resonant effects is proposed to minimize an error between the measured impedance of the transducer and the calculated impedance of the equivalent model. Unknown parameters of the equivalent circuit are estimated by using PSO algorithm. The proposed method is applied to an example transducer of the sandwich type with 3 resonances in the frequency band of interest. The analytical impedance of the estimated equivalent circuit model is compared with the measured impedance of the transducer and the validity of proposed method is verified.
Keywords
Transducer; Equivalent circuit; Impedance; PSO (Particle Swarm Optimization) Algorithm; Fitness function;
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