POWER AND PHASE RELATIONS FOR PIEZOCERAMIC BARS FORCED VIBRATIONS
V. L. KARLASH *
S. P. Timoshenko Institute of Mechanics, Nat. Acad. Sci. of Ukraine, (National Academy of Sciences of Ukraine) 3, Nesterov Str. 03057, Kyiv, Ukraine.
*Author to whom correspondence should be addressed.
This paper is devoted to analysis of the electric loading conditions problem for piezoceramic bars’ forced vibrations. New simple calculation/experimental technique together with computing permits to investigate many resonator parameters: admittance, impedance, phase angles, power components etc for constant amplitude input voltage, constant amplitude sample voltage and constant amplitude sample current electric conditions based on experimental data for “as there is” regime. Such computer modeling makes possible to decrease of the experimental difficulties and to study in linear approximations the dependence of resonators’ parameters from loading conditions. The fundamental mode of vibrations of thin piezoelectric bar is given as example. It is established that high admittance nonlinearity in constant amplitude voltage regime and its absence for constant amplitude current case are created by different behavior of instantaneous power level. The obtained results are in good agreement with experimental data.
Keywords: Piezoceramic resonators’ forced vibrations, electromechanical coupling factor, thin piezoelectric bars, instantaneous power components