Abstract
Amplitude-frequency and electromechanical characteristics of PZT-19 ceramic thin disk piezoelectric elements covered nonuniformly with electrodes are studied. It is shown that, in the case of in-phase connection of ring electrodes to one of the surfaces of a piezoelectric element, which enters the nonuniform stressed-strained state, mechanical vibrations can be excited at several resonance frequencies for which electromechanical-coupling coefficient k d reaches 67% of that attained for the piezoelectric element covered completely with electrodes.
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