Design of Radial Composite Longitudinal Vibration Piezoelectric Transducer Excited by Four Piezoelectric Stacks

A radial composite longitudinal vibration piezoelectric transducer excited by four piezoelectric stacks is made, which consists of a central coupling metal block, four piezoelectric stacks, four front fan-shaped metal mass and a cylindrical shell. Based on the four-terminal network method and the electro-mechanical analogy principle, the equivalent circuit model of the transducer is established and the resonance frequency equation is derived. The resonance frequency and acoustic performance of the radial composite piezoelectric transducer are analyzed by finite element software. The frequency response, directivity and electroacoustic conversion efficiency of the physical transducer is tested by impedance analyzer and anechoic pool. The theorical, simulative and experimental results show that the radial composite longitudinal vibration piezoelectric transducer excited by four piezoelectric stacks has horizontal omnidirection and high electroacoustic conversion efficiency. The resonance frequency is obtained by equivalent circuit method and finite element, which are consistent with the experimental test results.