In the IEEE Standard on piezoelectricity the electromechanical coupling factor is defined in static conditions as the ratio between the converted and the total energy involved in a transformation cycle (kmat). In this work we show that this definition can also be extended to dynamic cases: by means of 1–D models we demonstrate that, for loss less piezoelectric elements vibrating in the rod (longitudinal) or width (transverse) mode, the k factor can be defined as the square root of the ratio between the converted electric energy and the kinetic total energy; the obtained results are proportional to the appropriate kmat.
THE ELECTROMECHANICAL COUPLING FACTOR FOR LONGITUDINAL AND TRANSVERSE PROPAGATION MODES
IULA, Antonio;
2002-01-01
Abstract
In the IEEE Standard on piezoelectricity the electromechanical coupling factor is defined in static conditions as the ratio between the converted and the total energy involved in a transformation cycle (kmat). In this work we show that this definition can also be extended to dynamic cases: by means of 1–D models we demonstrate that, for loss less piezoelectric elements vibrating in the rod (longitudinal) or width (transverse) mode, the k factor can be defined as the square root of the ratio between the converted electric energy and the kinetic total energy; the obtained results are proportional to the appropriate kmat.File in questo prodotto:
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