An actuator is a device that converts input energy into mechanical energy. According to various types of input energy, various actuators have been advanced. Displacement in the electromagnetic, hydraulic and pneumatic actuators achieve by moving a piston via electromagnetic force or pressure, however the PIEZOELECTRIC actuator (piezoceramic plates) displace directly. Therefore, accuracy and speed in the PIEZOELECTRIC device are higher than other types of actuators. In the present work, the high-field electromechanical response of high-quality (1−x)(Bi 0.5Na0.5)TiO3–x(Bi0.5K0.5)TiO3 samples abbreviated to BNKTx with x = 0.18, 0.20, 0.22 and 0.24 ceramic materials across its MPB was investigated. The PIEZOELECTRICs and actuation characteristics were characterized. Ourresults indicate that x = 0.20, indeed, constitutes the best choice for the MPB composition in the system. Maximum of remanent polarization (37.5 mC cm-2) was obtained for x=0.20. High-field electromechanical responses were also obtained for BNKT0.20 samples. This material exhibited giant field induced strains of 0.13% under 1 kV mm -1 at room temperature.

Vibration energy harvesting with PIEZOELECTRIC material can currently generate up to 300 microwatts per cubic centimeter, making it a viable method of powering low-power electronics. A problem in PIEZOELECTRIC unimorph energy harvesting is to generate the most power with limits in system mass. This paper studies the effect of a PIEZOELECTRIC bimorph cantilever beam harvester shape on its electromechanical performance. A semi-analytical mechanical model was developed using Rayleigh–Ritz approximations for PIEZOELECTRIC energy harvester with tapered bimorph cantilever beam. A coupled field simulation model for the harvester is constructed using MATLAB and ABAQUS software to study the effect of varying the length and shape of the cantilever beam to the generated voltage and verification study is performed. Design optimization on the shape of the harvester is done to maximize output power. It is shown that tapered beams lead to a more uniform strain distribution across the PIEZOELECTRIC material and increase the harvesting performance.

The Levy-type analytical solution is employed for the problem of bending of cross-ply and antisymmetric angle-ply PIEZOELECTRIC hybrid laminated plates with at least two simply supported opposite edges. The governing equations of equilibrium are derived in the framework of the first-order shear deformation plate theory. The equations are classified according to the crystallography type of PIEZOELECTRIC layers and a comprehensive discussion on limitations of the method for the analysis of this kind of structures is performs. Finally, the governing equations of equilibrium are solved analytically with the aid of the state-space approach. We concluded that during the analysis of PIEZOELECTRIC hybrid laminated plates with Levy-type method, simultaneous applying of all electrical forces and moments is not possible (depending on type of lay-up, crystallography of PIEZOELECTRIC layers, and expansion of electrical potential, some of electrical forces and moments may not be considered). In order to study the accuracy and several numerical examples are examined. The numerical results are compared with those obtained by the Navier method and those presented in the other published articles. It is found that the present results have very good agreements with those obtained by other methods.