Abstract
Observation of the Chladni figures was made on a piezoelectric ceramic plate which may be used as a piezoelectric transformer. Many spurious vibration modes were easily excited besides the normal mode. Those spurious modes were found to be the thickness flexure mode. The position where the transformer is to be supported could be determined from the Chladni figures. The resonant frequencies of the spurious mode were in better agreement with the calculated values from the frequency equation of a rectangular beam vibration in the flexure mode rather than with those from Rayleigh-Lamb equation.
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