Research On Metal-piezoceramics Bimorph Flexural Piezoelectric Ceramic Transducer Resonance Frequency

In the past scores of years, piezoelectric transducer has been used widely in many fields such as electroacoustic , hydroacoustics , iatrology , military. Especially, metal-piezoceramics bimorph flexural piezoelectric ceramic transducer clamped along boundary is widely used in the field of manufacture and measure. For many kinds of piezoelectric ceramic transducer, equivalent electric circuit analysis, such as Mason equivalent electric circuit analysis and Krimholtz equivalent electric circuit analysis, is a kind of method in common use. With involved theoretics analysis and experiment, It is indicated that resonant frequencies of a piezoelectric ceramic transducer are very close to the mechanical resonance frequencies of its piezoelectricity oscillator under the assumption that the losses and damping are neglected. According to the mechanic characteristic of the piezoelectricity oscillator, the metal-piezoceramics bimorph flexural piezoelectric ceramic transducer clamped along boundary is considered as a circular thin plate with a fixed boundary and a metal-piezoceramic bimorph in the central section. Then a general solution of displace of piezoelectricity oscillator with the assumption the small deflection and the axial symmetry conditions are satisfied is presented. According to the general solution, the resonant frequencies of metal-piezoceramics bimorph flexural piezoelectric ceramic transducer are approached .