Design and simulation of vibration based energy harvesting device with stepped cantilever beams

This paper presents a vibration based energy harvester that is based on MEMS technology. In this paper, first we simulated a unimorph piezoelectric cantilever with non-traditional geometry and concluded that the particular structure is able to generate higher voltage and thus more power can be achieved, then we proposed that non- traditional structure (step sized beam) instead the conventional non linear springs with proof mass in the vibrational energy harvester and got higher displacement of the proof mass with the lower frequency range. This energy harvester is able to remove the battery problems in various fields like wireless sensors, military and biomedical applications etc. Displacement is measured for different applied pressures and various eigen frequencies. Simulation is carried out using COMSOL multiphysics.