A Novel Model of Piezoelectric-Electromagnetic Hybrid Energy Harvester Based on Vortex-induced Vibration

A novel piezoelectric-electromagnetic hybrid energy harvester based on vortex-induced vibration was presented, which could convert the kinetic energy of water into electrical energy by means of vortex-induced vibration. In this study, a series of experiments were carried out to compare the efficiencies of the novel hybrid energy harvester with the single piezoelectric or electromagnetic energy harvesters. The effects of the parameters including the cylinder diameter, load resistance and water velocity on the performance of the harvester were also investigated. The experimental results show that the hybrid energy harvester has a higher generating efficiency than the other two single harvesters. The maximum output power of 16.55mW was obtained under the combined influences of the parameters when the external resistances were 400 k!! in piezoelectric part, 2.2 k!! in electromagnetic part, the diameter of the cylinder and the water velocity were 50 mm and 0.6 mls respectively.