RESEARCH ON THE EXCITATION MODES OF PZT ELEMENT IN BENDING CYLINDRICAL TRANSDUCERS
The PZT element acts as a core component which transforms the input electric energy to output mechanical energy in ultrasonic transducer. So the excitation modes of PZT element have an important influence on the characteristics of transducer. The force factor formulas of cylindrical transducers based on the bending vibration mode are deduced in theory and the excitation modes of PZT elements in bending cylindrical transducers were investigated. In detail, the influence of distributing positions and dimensions of PZT plates on the output performance of transducer were discussed and simulated by FEM. It indicated that disposing the PZT plates on the peak of strain curve for the bending vibration mode is the optimal method to excite the transducer. The total length of PZT element should not exceed the distance of two vibration nodes. For the bending cylindrical transducer bonded with PZT plates, increasing the thickness of each PZT plate is propitious to enhance the output characteristics of this type transducer. Whereas, the thickness of each PZT plate should be decreased to achieve an excellent performance for the transducer with a sandwich structure.
Cylindrical ultrasonic transducer Bending vibration PZT element Excitation mode Force factor
Ting-hai CHENG Xiang-dong GUO Gang BAO
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150080, China
国际会议
深圳
英文
305-309
2011-12-09（万方平台首次上网日期，不代表论文的发表时间）