ABSTRACT In this work, the radial symmetric vibration modes of thin piezoceramic rings have been analyzed by means of a previously proposed theoretical model. Both the resonance frequencies and the effective electromechanical coupling factor (keff), as a function of the aspect ratio G between the inner and outer radii of the ring, were computed. The results have shown that the disk structure (G>1) has only one radial symmetrical mode (with its harmonics), but, for the ring structure (G>1), two different modes are clearly distinguished: the ring mode, which has no harmonics, and a width-like mode, with its harmonics. Moreover, the results show that the ring structure can be assumed to be definitely reached for G>0.6. An analysis of the material coupling factor in the ring geometry is reported as well.
1999 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control Vol. 46, pp. 1047-1049, 1999
© 1999, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.