The Study Of Piezoelectric Energy Harvester

With development of sensor technology and small electronic devices,their application environment is more and more extensive.In recent years,in the battlefield,underground and other inaccessible environments,the sensor and small electronic equipment applications demand is growing.In addition,with the development of low-power and ultra-low-power sensor technology,it is possible to obtain energy from the environment for its own power supply.In recent years,researchers have put forward a lot of self-powered sensor solutions,in which vibration-based energy harvesters has gradually become a hot point.In this paper,the theoretical analysis,numerical simulation and experimental analysis of the traditional cantilever beam piezoelectric energy harvesting structure is studied.In addition,a double-ended piezomagnetoelastic energy harvester is designed and studied in the view of the shortcomings of the existing energy harvesters' low efficiency and narrow bandwidth.The innovative research in this paper includes the following points:1.Based on the working state equation and the output characteristic equation of cantilever type piezoelectric energy harvest structure,the structure of the energy harvesters is optimized from the thickness of the base material layer and the arrangement of the piezoelectric material,and verified by experimental analysis.2.Combining the calculation of the force between the permanent magnets and the working state equation and the output characteristic equation of the cantilever beam piezoelectric energy structure,the output characteristic equation of the double-ended piezomagnetoelastic energy harvesting structure is deduced.And the optimal design of the captive energy structure for the permanent magnets' performance parameters and the distance between the permanent magnets is also given.And verified by experiments.The conclusions are as follows:1.The numerical results show that regarding cantilever type piezoelectric energy harvest structure,the output voltage of the capture energy structure can be the largest choosing appropriate thickness of base material layer.Regarding double-ended piezomagnetoelastic energy harvesting structure,the output voltage of the capture energy structure is the largest when the thickness of the piezoelectric material layer is the same.The experimental results show that increasing the piezoelectric material layer of double-PZT energy harvesting structures cannot improve the voltage output.2.The results show that the output voltage of the double-ended piezocomposite-coupled energy structure decreases with the increase of the remanence intensity of the permanent magnet.The output voltage of the captive-energy structure increases with the increase of the permanent magnet.The pitch increases.The experimental results show that the output voltage and the bandwidth of the capture energy structure can be effectively improved by using the magnetic coupling energy structure.When the distance between the permanent magnets is 5mm,the output voltage of the capture energy structure can be maximized.