DETERMINATION OF RESONANCE AND ANTIRESONANCE FREQUENCIES FOR PLATE-TYPE TRANSDUCERS MADE OF PIEZOCERAMICS, ON THE BASE OF ITS INPUT ELECTRIC IMPEDANCE FREQUENCY RESPONSE

In this work a piezoceramic plate loaded with water medium at one side and unloaded at opposite side is considered. On the base of frequency response calculations of input electric impedance, resonance and antiresonance frequencies are determined. The meaning of these terms is discussed. The results of calculations of the values of the said frequencies are presented for several values of electromechanical coupling factor squared. It is pointed out the possibility of another approach to determination of resonance and antiresonance frequencies in dependence on physical quantity which is determining in the use of the transducer. In this work such quantity is the input electrical impedance determining the total current through the transducer. Another possible approach consists in consideration of mechanical quantity – vibrational speed on the working face (at the output of the transducer), that in the analogous scheme is the «current» through the radiation impedance. Some comparative results are presented for both approaches. It is noted that the results have differences, but these differences are small enough.

Authors: S. I. Konovalov, A. G. Kuz’menko

Direction: Instrument Engineering and Information-Measurement Technologies

Keywords: Input electric impedance, piezoelectric plate, resonance frequency, antiresonance frequency, electromechanical coupling factor, water medium

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