Dynamic Analysis Of An Electromagnetic Tristable Vortex Induced Vibration Energy Harvester

The harmful gases discharged after the use of traditional fossil fuels will seriously pollute the environment and become the main cause of greenhouse effect.In recent years,ocean current,tidal current and other green renewable and clean energy sources have attracted much attention,and the research on energy capture based on flow-induced vibration has become a hot topic.The coupling method of cantilever beam and piezoelectric plate is used to capture energy in fluid environment,but this method is limited by the development of piezoelectric material itself.And most of them are linear systems,which are not ideal for energy harvesting in natural environments.This article from the cylinder wake oscillator,nonlinear systems,electromagnetic energy conversion of three steady-state electromagnetic ere vortex-induced vibration can device through theoretical analysis,the working mechanism of the one-way gear device,introduced structure,put forward a three steady-state electromagnetic ere vortex-induced vibration device model,established the mechanics model and dynamics equation,The dynamic response and power generation performance of bistable and tristable systems are compared.The influence of one-way gear structure and parameter changes of flywheel on the power generation characteristics of the device is explored.The main research work is as follows2:A three-steady-state electromagnetic vortex-induced vibration energy harvesting device was proposed.According to its mechanical model,the dynamic equation of fluid-solid-electric coupling was established.The wake vibrator model,nonlinear system model and unidirectional clutch model were analyzed respectively.The equilibrium point of the system is studied by static bifurcation analysis,and the stability of the system is verified.At the same time,the influenc degree of the nonlinear system parameters a、b、c、l、Ks on the system potential energy function is analyzed,and the specific research parameters are determined based on the conclusion.The characteristics of the bistable system and the three-steady system are compared by studying the dynamic response and power generation performance.The three-steady system has a shallower potential well and a wider equilibrium point.Under the premise of large movement,both amplitude ratio and generating power of the generation device with three-steady system are obviously better than that with bistable energy harvester.By changing the nonlinear system parameters to study the potential energy function,it can be seen that b、L the three steady state parameters have a great influence on the potential energy function.Through simulation analysis of the influence of system structural parameters(mass ratio,blunt body diameter,load resistance)on the dynamic characteristics and energy harvesting effect of the three-state VIV energy harvester:all of them increase rapidly and then decrease;It shows that there is an optimal parameter for the three-steady state energy harvester.The unidirectional clutch structure can make the power drop more slowly,and it will enter the combination state again when it drops to a certain value;Increase power by increasing energy capture efficiency per unit of time.Through the above research work,the energy harvesting advantages of the three-steady-state electromagnetic vortex-induced vibration energy harvesting device are explored,which provides a reference for the research of other related types of energy harvesting devices.