Simulation And Experimental Research Of Rotary Cantilever Beam Piezoelectric Energy Harvester With Magnets

Energy is closely related to social development.To properly handle the relationship between energy and social development,we need to improve energy supply through the continuous upgrading of science and technology.In the field of micro-power,with the increasing demand for micro-electronic devices,the problem of micro-energy supply has been put to a new challenge.The traditional energy supply method guarantees the normal operation of a large number of microelectronic devices by means of energy storage structures such as batteries.However,this method does not meet the environmental friendly philosophy and has the limitation of service life,and is not suitable for the requirements of miniaturization,low power consumption and long working-time sustained of microelectronic devices.Under the background of the increasingly prominent energy supply problem of micro-electronic devices,the vibration energy harvester based on piezoelectric effect has attracted the attention of researchers in related fields.New solutions have been put forward continuously,which provide new ideas for the collection and utilization of micro-power.In this paper,the auxiliary magnetic rotating beam piezoelectric energy harvester is taken as the research object,and experiments are designed and carried out.Combined with the finite element simulation,the output voltage characteristics and vibration mechanical behavior of the piezoelectric energy harvester are analyzed,and corresponding devices are designed.The research object of this paper is the rotary cantilever beam piezoelectric energy harvester with magnets,which combines the rotating piezoelectric cantilever beam with the auxiliary magnet and uses the magnetic force of the magnet to excite the vibration of the rotating piezoelectric cantilever beam,and study the power generation characteristics of different auxiliary magnet structures.The influence of various physical parameters on the power generation capacity of the auxiliary magnetic rotating piezoelectric cantilever is studied,and the structure optimization of the auxiliary magnetic rotating piezoelectric cantilever is carried out combined with the influence of physical parameters.Finite element simulation is carried out.The rotating cantilever beam and the rotating magnets are simulated respectively to obtain the mechanical characteristics of the rotating cantilever beam and the magnetic characteristics of the rotating magnets.The magnetic force of the rotating magnet and the rotating cantilever beam are combined to carry out the simulation study of the auxiliary magnetic rotating beam piezoelectric energy harvester.The simulation data of the output voltage are obtained and compared with the experimental results.Design corresponding devices for different application scenarios.The main research contents of this paper are divided into the following parts:(1)According to the research object of this paper,the experimental design is carried out.According to the experimental technical route,the experimental process is drawn up;the special fixture is designed,the experimental equipment is selected,and the experimental platform is built;the experimental materials are selected,and a series of experimental models of auxiliary magneto-piezoelectric rotating cantilever beam are designed.(2)The output voltage characteristics of each experimental model are experimented,and the effects and trends of output voltage of different experimental models are studied.The effects of different physical parameters on the output voltage characteristics of the research object were experimented,and the experimental structure was optimized and the experimental results were analyzed.The influence of magnetic distance,tip mass,number of auxiliary magnets and length of beam on the output voltage characteristics of the experimental model is mainly studied.The reasons for the influence of various parameters on the experimental results are analyzed,and the experimental results are explained.According to the experimental results,the structure was optimized and the optimized physical parameters were determined.(3)The simulation of the research object of this paper is carried out.The rotating cantilever,the rotating permanent magnet and the rotary piezoelectric cantilever beam with magnets are simulated step by step.COMSOL Multiphysics software is used to build the model of the structure of each part,divide the grid reasonably,set the correct material parameters,and analyze the simulation results combined with experiment and theory.The simulation results and experimental results are compared,and the credibility of simulation and error analysis are evaluated.(4)The device design based on the rotating piezoelectric cantilever beam with magnets is carried out combined with the experimental results and simulation results.In order to meet the needs of different application scenarios,two devices are designed,one is the alternating buckling wind piezoelectric energy harvester for outdoor applications,and the other is the rotary self-powered wireless switch for indoor applications.The design of the two devices refers specifically to the power generation characteristics and vibration mechanics characteristics of the rotary beam piezoelectric energy harvester with magnets in this paper,which provides a reference and a new idea for the device design of the energy harvester.