The Simulation And Experimental Study On The Power Generaion Of The Cantilever Piezoelectric Energy Harvester

With the wide utilization of MEMS, portable electronic equipment and wireless sensors, how to supply sufficient energy to the microelectronic products became a hotspot in research community currently. Traditional chemical battery has a huge amount of drawbacks, such as limited energy storage, short battery life, environmental pollution and periodic replacement requirement. Therefore, researchers start to find a method which can harvest the energy from the environment in order to support microelectronic products. An alluring prospect of piezoelectric power generator has been showed in front of us, because of its high efficiency, low hear emission, environment friendliness, non-electromagnetic interference, processing simplicity, microminiaturizing and integrating easiness. This paper will mainly describe the research of cantilever beam piezoelectric energy harvester because of its simple structure, low resonant frequency, closeness to the environmental frequency, and good performance in resonance condition.In this research, cantilever beam piezoelectric energy harvester is initially analyzed through the ANSYS simulation. Piezoelectric energy harvester is equivalent to a power source including an ideal voltage source, a resistance, an inductance and a capacitance. Through the simulation, the parameters of various frequencies are obtained. Based on this equivalent circuit, this paper analyzes the optimal power output while the load impedance is the matching resistance, inductance and capacitance. Then, the impact of the damping ratio on performance of piezoelectric energy harvester is analyzed.The finite element simulation models of single cantilever beam, multiple cantilever beam and multi-mode broadband piezoelectric energy harvester are developed and the impact of tip mass on harvester output performance is analyzed. Then through the ANSYS and Multisim simulation, three different piezoelectric energy harvesters'output performances are compared.Finally, cantilever beam piezoelectric energy harvesters'experimental system is established to verify the results of simulation analysis. The laser vibrometer and impedance analyzer test the vibration modes and impedance of harvesters, and the results basically match the simulation analysis. Then, the experiment does the energy harvesting research on different piezoelectric energy harvesters, gets the matching impedance and compares the output performances of different piezoelectric energy harvesters.