title: Analysis of the radial symmetrical modes of thin piezoceramic rings.
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 (k(eff)), 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-->0) 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.
authors.affiliation: Dipt. di Ingegneria Elettronica, Rome Univ.
authors.forename: A
authors.initials: A
authors.lastname: Iula
authors.forename: N
authors.initials: N
authors.lastname: Lamberti
authors.forename: R
authors.initials: R
authors.lastname: Carotenuto
authors.forename: M
authors.initials: M
authors.lastname: Pappalardo