Study On The Power Generation Performance Of Improved Bistable Vortex-Induced Vibration Energy Harvester

The forms of vibration mainly include mechanical energy,tidal energy,wind energy,water energy,etc.Compared with other vibration energy,water energy has the advantages of green environmental protection,sustainable use and wide distribution as new energy sources.Hot topic currently discussed.With the emergence of low-power sensors,the use of vortex-induced vibration to provide self-power for miniature sensors is a hotspot in research environmental monitoring.Based on the combination of improved nonlinear restoring force and vortex-induced vibration,this paper proposes an improved bistable vortex-induced vibration energy harvester,establishes a mechanical model and an electromechanical coupling equation.The dynamic characteristics of vibration energy traps are studied in depth.The main research work is as follows:According to the simplified model of the improved bistable vortex-induced vibration energy harvester,the mechanical model and the electromechanical coupling equation are established.The static bifurcation analysis demonstrates the improved bistable vortex-induced vibration energy harvester system at low flow rate The stability of the equilibrium point under the impact of the same time,at the same time,the effect of the small magnet spacing d1 on the system potential energy function and the locking interval and the critical point of the range of the locking interval when d1 decreases continuously are studied.The difference between the vortex-induced vibration system based on linear resonance and the nonlinear resonance at low flow velocity is studied.The differences between the potential energy function,vibration amplitude,output power,and dynamic response graph are compared.After the introduction of nonlinear restoring force,the bistable vortex-induced vibration energy harvester system is better than the monostable vortex-induced vibration energy harvester system in terms of power generation performance,while the improved bistable vortex-induced vibration energy harvester system Better than bistable vortex-induced vibration energy harvester system.At the same time,the influence of the change of magnetic force on the output power of the system after the introduction of the small magnet is studied.Finally,the range of the resonance region of the system at low flow velocity is determined by the idea of the half-power bandwidth method.The vibration response of the improved bistable vortex-induced vibration energy harvester at low flow rate,the mass ratio,damping ratio,diameter,load resistance and other parameters of the improved bistable vortex-induced vibration energy harvester to The law of power generation efficiency.With the help of the orthogonal experiment method,all parameters of the system structure are matched and selected,and the parameter group with the best vibration response and power generation efficiency of the improved bistable vortex-induced vibration energy harvester under fluid excitation is obtained.Through the above research work,the energy-trapping characteristics of the improved bistable vortex-induced vibration energy harvester system are obtained,which provides some reference for the related research of the vortex-induced vibration energy harvester,which is beneficial to the sustainable development of energy.