Abstract
The vibrating piezoelectric cantilevers are important objects in contemporary physical acoustics and their applications including the hot topic of robotic flying insects, MEMS, and various actuators. In this work, we study different cantilevers consisting of the piezoelectric layers and a thin steel layer. The three-layer bimorph composite cantilever includes a central steel sheet covered with two oppositely polarized coatings made of a piezoelectric ceramic. We compare the amplitudes of tip vibrations in the bimorph composite structures with the simpler cases of a single piezoelectric layer with one to three ferroelectric domains sitting on a steel substrate as well as without the steel support. Theoretical calculations of the amplitude of acoustical vibrations of the actuator tip are performed with the help of a finite element method developed for piezoelectric media. The corresponding codes were verified and adopted by the experimental measurements from the 12-mm long and 0.5-mm thick PZT-cantilever vi...
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