This study uses the finite element method (FEM) to analyze the excitation and dead vibration modes of two-dimensional quartz\nplates. We first simplify three-dimensional quartz plates with plane strain simplification and then compare the modes of the\nsimplified three-dimensional plates to those of two-dimensional plates. We then analyze quartz vibrating elements of AT-cut\nplates and SC-cut plates. To understand the regularity of the resonance frequency of plates that are excitable by voltage loading,\nwe compare the natural vibrations of quartz plates with the excitation frequency generated after the plates are excited by voltage\nloading.
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