Simulation And Experimental Study Of Piezoelectric Cantilever Energy Harvester

In the past,people mainly used batteries to power wireless sensors and other equipment.However,the batteries have a limited life and need to be replaced with new batteries.Most of the wireless sensors and other equipment have poor working environments and widely distributed nodes.Changing batteries one by one requires expensive cost.With the continuous advancement of electronic technology,the power consumption required by devices such as wireless sensors is getting lower and lower,and it is possible to obtain energy from the environment around the device to power it.This paper mainly researches the capture performance of the energy harvester from the perspective of simulation and experimental analysis.The specific work content is as follows:(1)A finite element model of an inverted trapezoidal piezoelectric vibrator energy harvester is established.The effects of piezoelectric vibrators with different upper and lower widths,the weight of the mass,the length of the support plate,the external excitation,and different load resistances on the collection performance of the energy harvester.The study found that when the width of the upper base is 10 mm,the collected voltage is 6.7V,and when the width of the upper base is 4mm,the collected voltage is 8.1V,and the voltage is increased by about 20.9%.It can be seen that as the width of the bottom of the trapezoidal piezoelectric vibrator is reduced,the voltage collected is higher,and the material is also saved.(2)A simulation model of the mechanical energy-magnetic energy harvester is established.The cantilever beam structure is used to collect the mechanical energy,and the top magnet and the magnetostrictive material are used to collect the magnetic energy,thereby achieving the collection of various forms of energy in the environment.The effects of different types and geometries of piezoelectric materials,different external conditions,and load resistance on the energy harvesting efficiency of energy harvester were also studied.The results show that receiving piezoelectric materials are more suitable for use in energy harvester.The voltage collected under the combined action of vibration and magnetic field is equal to the linear superposition of the voltage collected under the respective action,and the collected power is a non-linear superposition.(3)Experimental research on two-degree-of-freedom magnetic energy harvester.In this part,we analyze the number of different magnets and the distance from the top of the magnet from an experimental perspective.The influence of the magnet's upper and lower distribution methods,magnetic field direction and PMMA board length on the energy collection efficiency,more intuitively shows the efficiency of energy collection,and the relevant conclusions can play a certain guiding role in the development of multi-degree-of-freedom energy harvester devices.