Theoretical And Experimental Research On Piezoelectric Plate Energy Harvester Impacted By The Air Load In Sealed Chamber

Pneumatic technology has been widely used in the field of industrial automation due to its advantages of high efficiency,safety and low cost.It is necessary to use a variety of sensors,such as the pressure,flow,temperature and position sensors,for real-time data acquisition because of the complexity of pneumatic system and many state parameters.In order to solve the energy supply problem of the sensors in pneumatic system,this thesis researches on piezoelectric plate energy harvester impacted by the air load in sealed chamber.Piezoelectric material has the advantages of simple structure,high energy density and easy installation.A piezoelectric energy harvester for high pressure environment in the industrial is developed.This paper analyzes the generation mechanism of piezoelectric patch in high pressure air condition.The mathematical model of piezoelectric patch is established.The flexural deformation of piezoelectric patch has been analyzed in high pressure air load.The relationship between deformation and energy transformation is researched.The power generation characteristics,such as the different sizes and thicknesses of piezoelectric plates,are analyzed by ANSYS simulation software.The characteristics of the piezoelectric harvester under high pressure air condition are researched based on the results of theoretical analysis.The single chamber piezoelectric energy harvester is presented and the structure and size is designed.The test system of the output voltage characteristics is established through the LabVIEW programming software.The output voltage of single chamber piezoelectric harvester has been researched and analyzed.The complex air load environment has been simulated based on the single chamber piezoelectric harvester.The piezoelectric energy harvesting under the vortex and the alternating air load excited are researched.The theoretical analyse the formation mechanism of vortex field.It is assumed that the air is rigid flow in the sealed chamber.The relationship between the storage energy and inertia moment of vortex has been established by the mathematical model.The velocity vector distribution of the force in the cylinder has been researched.It can guide the design of coupled chamber of piezoelectric harvester.The simulation analysis of the formation and distribution in the coupling chamber has been researched.The different size of coupling chamber internal flow field is analyzed by using FLUENT simulation software.The experimental prototype is designed and the test system has been built.The different experimental means of vortex has been used for researching the characteristic of piezoelectric harvester.The matching relation is analyzed through external load resistor.Different air parameters can influence the energy conversion efficiency.The experimental results show that the vortex can improve the energy conversion efficiency of the energy harvester.It is a special situation of constant mass fraction air condition in the sealed chamber.Theoretical analysis mode is established for research the rules of air compression process.A prototype and test system of mass fraction piezoelectric harvester is built.The electric energy conversion characteristics of energy harvesting are analyzed.Finally,the experimental research on the piezoelectric energy harvester under the aerodynamic condition is carried out,and the experimental prototype of the piezoelectric energy harvester is designed.In this paper,numerical simulation and Experimental has been researched for in-depth analysis of the various closed environment pneumatic piezoelectric harvesters.The research can solve the pneumatic wireless sensor supply and the basement of theoretical and experimental can be provided.