Karlash V. . Experimental-theoretical analyze of the electromechanical resonant vibrations and energy transform efficiency in the piezoceramic thin construction elements.

The work is devoted to the complex theoretical and experimental investigation of the resonant electroelastic vibrations, energy transform efficiency and dynamic stress state in the piezoceramic plates, shells of rotation and spatial bodies as the construction elements under harmonic loading. An original experimental method named as a piezotransformer transducer method was used for determination of the dynamic stress state in all the piezoceramic samples. The general analytic solutions for radial vibrations of thin disk with concentric ring electrode coating, for nonsymmetrical vibrations of the piezoceramic rings with divided electrodes and for longitudinal vibrations of the rectangular monolithic plates with two sections of transverse and longitudinal polarization were made. Experimental investigations of wide class of the important engineering problems such as the determination of dynamic stress state, characteristic frequencies, resonant conductivities and electromechanical coupling factors wereprovided. A successful attempt of studying the internal mechanical stresses in spatial hole segmented cylinder was made in the work. The behavior of the piezoceramic construction elements un-der influence of the high mechanic, thermo or electric fields was investigated.