Abstract
We perform a theoretical analysis on electrically forced, coupled thickness-shear and flexural vibrations of rectangular piezoelectric plates of monoclinic crystals. Mindlin's first-order theory for piezoelectric plates is used, simplified by the flexure-twist approximation by Mindlin and Spencer. Two types of boundary conditions are considered. Trigonometric series solutions are obtained. The motional capacitance of the plates and its frequency dependence under a time-harmonic driving voltage, an important property when the plates are used as piezoelectric resonators, are calculated and examined from the series solutions for quartz and langasite plates.
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