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| Design of a snowflake-shaped two-dimensional coupled vibration sandwich piezoelectric ultrasonic tranducer |
| XU Long1,2, WANG Weizhen1, GONG Tao2, LI Guo3, ZHAO Lun2, ZHOU Guangping2, LIANG Shaofeng2 |
| 1.College of Science, China Jiliang University, Hangzhou 310018, China；
2.Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen 518055, China；
3.Xi’an Key Laboratory of Advanced Control and Intelligent Processing, Xi’an University of Posts &Telecommunications, Xi’an 710121, China |
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Abstract In order to realize the multi-directional ultrasonic radiation for a single transducer, a new type of snowflake-shaped two-dimensional coupled vibration sandwich piezoelectric ultrasonic transducer was proposed, which consists of a hexagonal prismatic metal block, six groups of piezoelectric ceramic crystal stacks and six metal cover plates. Based on the coupled vibration theory and the principle of electromechanical analogy, the equivalent circuit model of the transducer is established, and the resonance and anti-resonance frequency equations are derived. The two-dimensional coupled vibration characteristics of the transducer are studied by equivalent circuit method, finite element method and experiments. The results show that the effective electromechanical coupling coefficient of the transducer is higher when the piezoelectric ceramic stack is closer to the hexagonal prism central metal block. The longitudinal coupling resonance frequency decreases with the increase of the axial size of the transducer. In the longitudinal coupling resonance mode, the six output ends of the transducer can output consistent longitudinal displacement amplitude. The equivalent circuit method, finite element simulation and experimental test have achieved relatively consistent results. The research results of this paper provide a concise design theory for the engineering application of this kind of transducer. The research results are expected to be applied to multi-dimensional ultrasonic machining, multi-directional ultrasonic radiation and other fields.
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Received: 15 June 2023
Published: 28 April 2024
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