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Analysis on the cascade high power piezoelectric ultrasonic transducers

  • Lin, Shuyu (Shaanxi key Laboratory of Ultrasonics, Shaanxi Normal University) ;
  • Xu, Jie (Shaanxi key Laboratory of Ultrasonics, Shaanxi Normal University)
  • Received : 2017.03.24
  • Accepted : 2018.01.26
  • Published : 2018.02.25
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Abstract

A new type of cascade sandwiched piezoelectric ultrasonic transducer is presented and studied. The cascade transducer is composed of two traditional longitudinally sandwiched piezoelectric transducers, which are connected together in series mechanically and in parallel electrically. Based on the analytical method, the electromechanical equivalent circuit of the cascade transducer is derived and the resonance/anti-resonance frequency equations are obtained. The impedance characteristics and the vibrational modes of the transducer are analyzed. By means of numerical method, the dependency of the resonance/anti-resonance frequency and the effective electromechanical coupling coefficient on the geometrical dimensions of the cascade transducer are studied and some interesting conclusions are obtained. Two prototypes of the cascade transducers are designed and made; the resonance/anti-resonance frequency is measured. It is shown that the analytical resonance/anti-resonance frequencies are in good agreement with the experimental results. It is expected that this kind of cascade transducer can be used in large power and high intensity ultrasonic applications, such as ultrasonic liquid processing, ultrasonic metal machining and ultrasonic welding and soldering.

Keywords

Acknowledgement

Supported by : Natural Science Foundation of China

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