Design And Experiment Of A Blowing-Type Piezoelectric Wind Energy Harvester

Compared to electromagnetic and electrostatic energy harvesters, the piezoelectric energy harvester has the advantages of high energy density, fast response, no electromagnetic interference, easy to implement miniaturization and integration. On the basis of this, the piezoelectric energy harvester has a broad application prospect in the energy harvesting of vibration and fluid. To meet the demands of self-powered monitoring system for energy at low-speed wind, a blowing-type piezoelectric wind harvester is presented. The output performance of the generator was studied theoretically and experimentally. The specific contents of this paper are as follows:1. The simulation models of the rectangular single piezoelectric vibrator and the vibrator adding proof mass/flexible beams in the free-end of the single piezoelectric vibrator were established and simulated. The influence of the structure and size of single piezoelectric vibrator on the displacement and stress under a certain wind speed were found. The simulation results show that the rectangular single piezoelectric vibrator can’t to reach resonance state under wind excitation because of its high natural frequency. Increasing the length of the piezoelectric vibrator properly and adding proof mass/flexible beams can effectively reduce the natural frequency, So as to match the different wind speed and improve the performance.2. The theoretical models of the blowing-type piezoelectric wind harvester was established by using the theory of vortex induced vibration and vibration analysis, and the simulation and analysis are carried out, the influence of wind speed, proof mass and attack angle on the blowing-type piezoelectric wind harvester were obtained. The results show that there were best attack angle, proof mass and wind speed to output the maximum voltage when the other conditions are determined, and the best parameters influence each other.3. In order to prove the feasibility of the blowing-type piezoelectric wind harvester and the reasonableness of established theoretical model, blowing-type piezoelectric wind harvesters were designed and manufactured, and the test system was built. The influence of wind speed, proof mass, the thickness/length of the flexible beam and attack angle on the blowing-type piezoelectric wind harvester were achieved by the experiment. The results show that adding proof mass/flexible beams, wind speed, adjusting proof mass and attack angle can improve the performance of the blowing-type piezoelectric wind harvester.