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Investigation on Radial Composite Round Tube Piezoelectric Ceramic Ultrasonic Transducer
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LIU Shiqing1,YAO Ye2
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(1. Applied Acoustic Institiute, Zhejiang Normal University, Jinhua 321004, China; 2. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240,China)
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Abstract The radial vibration of a radial composite round tube piezoelectric ultrasonic transducer was studied. The transducer consists of an inner radially polarized short piezoelectric ceramic round tube and an outer short thinwalled metal prestressed tubular shell which are compounded in the radial direction. Based on the elastic dynamics theory and the electromechanical analogy, the equivalent circuit of the radial composite piezoelectric transducer is derived. The analysis formulae of the resonance frequency and the antiresonance frequency equation as well as the effective electromechanical couple coefficient of the transducer are obtained. By testing the radial resonance frequencies and the effective electromechanical couple coefficients of some trialmade transducers,it is shown that the theoretical radial resonance frequencies of the transducers from the frequency equation in this paper are in a good agreement with the measured results.
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Received: 10 May 2010
Published: 28 February 2011
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