Improved Wideband Mechanical Energy Harvester based on Longitudinal Piezoelectric Mode

Abstract In the present paper, we discuss how we can improve the efficiency of a vibration energy harvester (VEH) by considering three main key issues: (i) the optimization of the design shape for more conversion efficiency (ii) the adaptation between the resonant frequency and the vibration one for more extraction of mechanical energy, (iii) the adaptation between the mechanical and electrical damping forces for more extraction of electrical energy.