Energy Harvesting Using MEMS Porous Functionally Graded Piezoelectric Cantilever Beam
1Mechatronics Engineering Department, School of Engineering-Emerging Technologies- University of Tabriz- Tabriz- Iran
2Department of Mechanical Engineering, Islamic Azad University, Salmas Branch, Salmas, Iran
This study deals with the analytical design of a vibrational energy harvester which is composed of functionally graded piezoelectric material. The effects of porosity existence on the responses of the FG piezoelectric MEMS bimorph cantilever beam is investigated with both axial and transverse deformations. Furthermore, Hamilton’s principle is utilized in order to obtain the governing equations of motion and also, they are solved by Galerkin method. Since the effect of elastic mode shapes related to lower frequencies are overcoming the higher frequencies mode shapes, some of the first mode shapes are utilized for studying the transverse shape changing of Euler-Bernoulli beam. Moreover, the frequency response is carried out for the case of near resonance frequencies due to the effects of volume fraction index and porosity coefficient with different values. The output power of the energy harvester is presented with respect to the output resistance in order to obtain the enhanced efficiency.