Modeling and experimental verification of the thin multi-electrode piezoceramic bars' forced vibrations

This paper is devoted to analysis of the multi-electrode piezoceramic bars' forced vibrations. Analytical model is built for a thin and narrow piezoelectric ceramic bar with three pairs of divided electrodes on the upper and lower main surfaces. The formulae for input admittance, characteristic (resonant and anti-resonant) frequencies as well as for transform ratio are obtained. The fundamental modes of vibrations of thin piezoelectric bar and their odd and even overtones are studied. A new experimental simple technique with additional commutation permits to study many resonators' parameters: admittance, impedance, phase angles, power components etc. Experiments have been carried out with TsTBS-3 bar-prism 70.3x8.1x6.8/7.1 mm size. It is established that a high electromechanical coupling may be obtained for bar's longitudinal overtones by means of the electrode coating dividing and anti-phase electrical loading. In partly shorted electrodes case, not only odd but even longitudinal modes can be induced, which are absent for full electrodes case.

multi-electrode piezoceramic bar
forced vibrations
коефіцієнт електромеханічного зв’язку
input admittance
transformation ratio
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