| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 96 === In this thesis, the compound piezoelectric transducers are studied. Piezoelectric transducers are widely used in ultrasonic applications such as ultrasonic motor, ultrasonic welding, ultrasonic cleaning and underwater sound. They are mainly used to convert electric signals to mechanical vibrations or acoustic wave. In these applications, compound transducers such as longitudinal, flexural and torsional transducers have found more and more applications corresponding to various purposes. Usually, the resonance frequency and vibration mode of the piezoelectric transducer are important in the design and assembly. They are determined by its material parameters and geometrical dimensions. The high power characteristics of the transducer also include the output acoustic power, the electro-acoustic efficiency, the temperature rise, the vibration displacement distribution and others.
In this study, flexural and torsional transducers are theoretically analyzed. In addition, finite element analysis method (ANSYS) is used to verify the theoretical results. The resonant frequencies, vibration modes and input impedance of the transducer are obtained and discussed in this study. Finally, a flexural piezoelectric transducer is manufactured for the experiment. The vibration characteristics of the transducers are measured and a ball rotor rotating experiment is also conducted.
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