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Circular piezoelectric elements with torsional vibration abilities are widely utilized as electromechanical transducers in various ultrasonic devices. In this paper, in-plane torsional vibration of a piezoceramic ring with spiral interdigitated electrodes is studied theoretically and numerically. Design of the electrodes and working principle of the ring are described. Mechanical and electrical models...
The vibration characteristics of a piezoelectric fiber actuator with helical electrodes are studied theoretically and experimentally. Its working principle indicates that the torsional, longitudinal, and tangential deformations of the fiber are coupled. A simplified dynamic model is deduced to investigate the properties of the coupled vibrations and their corresponding equivalent circuits are also...
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