Research On Energy Harvesting Piezoelectric Properties Of Bistable Buckling Based On Karman Vortex Street

In the process of pipeline fluid power generation,it is an innovative way to realize the energy supply characteristics of wireless monitoring nodes.In the flow field,the excitation frequency of the fluid is formed based on the Karman vortex effect,and the energy conversion of the tiny power source driving the piezoelectric power generation and the high-frequency fast output of the electric power have important significance.In order to convert mechanical energy into electrical energy more quickly and effectively,the problem of water seepage is blocked by using the Kamen vortex to monitor the flow velocity and pressure of the pipeline.Therefore,the use of Carmen vortex to form the energy-trapping characteristics of bistable piezoelectric buckling beams in the laying of branch roads has become the focus of current research.In this paper,an improved device for flexible power generation of buckling beams based on the Karman vortex street effect is designed.The bistable piezoelectric power generation device of buckling beams is used as the research object.Simulation and fluid analysis are used:A mechanical model is established for a device with flexible power generation effect of flexural beam underwater wide-band flow-induced vibration of Carmen vortex street effect.Firstly,through the numerical simulation,the relationship between the nonlinear restoring force of the buckling beam and the structural parameters such as length,width,thickness,etc.is deduced,and the influencing factors of different structural parameters on the well depth are analyzed,and the control equations of the system are obtained.Dimensionalize the model and study and analyze the law of the average power of the large-scale movement of the underwater wide-band flexible power generation effect of the buckling beam of the Karman vortex effect under different structural parameter ranges under sinusoidal excitation.The influence of the average output power of the bistable piezoelectric buckling beam power generation system under water resistance was studied by numerical simulation.Firstly,the influence of the change of excitation parameters on the resistance of the fluid to the system over the barrier is analyzed.Then,the effect of changing parameters ? on the energy capture of the bistable Karman vortex street is studied.With the decrease,the capture energy characteristics ? gradually increase,and the optimal solution for the large double-trap motion of the system is obtained.At the same time,the effect of changing the damping ratio on the capture energy of ? the system structure,with the increase of the amplitude of the motion significantly reduced,it is difficult for the system to capture energy effectively.This shows that the specific damping ratio ? has a greater impact on power,and the system has a large period range.CFD simulation results were used to obtain different pulsating pressure curves,and the nonlinear dynamic model of the numerical simulation process was used to obtain the power generation performance of the Karman vortex under different bluff bodies.Better realization of energy trapping characteristics.Through the above work,the influence of the structural parameters of the bluff body and different shapes on the average output power of the bistable piezoelectric buckling beam power generation system in the eddy current field is obtained systematically.In the study of the Karman vortex effect,the effective application of the energy-trapping characteristic system of the bistable piezoelectric buckling beam provides theoretical and experimental reference.