Dynamic Analysis Of Tri-stable Galloping Energy Harvester

With the development of micro-electric originals and the shortage of resources and the deterioration of the ecological environment,the search for a clean energy source has become a hot research topic.There are abundant water resources in nature.When the fluid passes through the bluff body,vortex will be generated in the tail to induce the vibration of the bluff body.Galloping is a common flow-induced vibration phenomenon,and is divided into wake galloping and wake galloping.Vibrate two common vibrations.At present,there are precedents for collecting and utilizing galloping energy.Among them,the cantilever beam-piezoelectric coupling method is mostly used,but most of them are monostable and bistable cantilever beam systems,which have large vibration velocity and low energy utilization efficiency.In order to improve the power generation efficiency of the galloping energy trap,this paper introduces a magnet-cantilever coupling tri-stable system,and proposes a tri-stable wake galloping energy trap and a tri-stable wake galloping energy trap.The effects of changes in the tri-stable system on its power generation performance are also studied.The main research work is as follows:Simplify the tri-stable galloping model and carry out dynamic modeling to normalize it.The stability of the equilibrium point of the tri-stable system is demonstrated through the analysis of the static bifurcation;the existence region and the critical range of the parameter value are obtained by changing the parameters of the tri-stable system,and three well depth conditions are carried out on the region Divide;study the influence of the change of the parameters of the tri-stable system on the equilibrium point,and get the change trend of the influence of the change of ? value and the change of y value on the equilibrium point when the value of ? is fixed.The characteristics of the bistable system and the tri-stable system are compared,and the effects of the two systems on the amplitude characteristics of the cross-flow gallop and the power generation characteristics are studied.The equilibrium point of the tri-stable system is wider,the well depth is shallower,and more It is easy to oscillate at a lower flow rate,and the power generation performance is higher;the effect of a single change of the tri-stable system parameters on the galloping amplitude ratio,dynamic response,and power generation performance is studied,and the tri-stable system is obtained in three wells.When the depths are equal,the system is more prone to inter-well motion and better power generation performance;studying the response of different well depths at equal equilibrium points to the tri-stable wake galloping system,the smaller the ? value,the greater the depth of the corresponding well depth system.Low,the larger the opening degree,and the lower the trap depth,the lower the oscillating flow rate of the tristable transverse flow galloping system,and the better the power generation performance;studying the response of the different equilibrium points of the other well depth to the tri-stable transverse flow galloping system,we get Corresponding to the same well depth,the smaller the value of ?,the wider the balance point,and the change of the balance point has little effect on the opening of the potential wells on both sides.The wide balance point system can make the amplitude of the bluff body larger and the power generation performance better.Simplified the tri-stable wake gallop model and carried out dynamic modeling to normalize it.Introducing the same tri-stable parameters,comparing the response difference between galloping and wake galloping from the amplitude ratio,dynamic response,and power generation performance,it is obtained that there is an effective working bandwidth for wake-galling and the wake-galling is suitable for low flow velocity The power generation in the workplace is more efficient at high flow rates;the response of the tri-stable system with different potential well depths at equal equilibrium points to wake galloping is studied,and the universality of the effect of the tri-stable system on the power generation performance of the voltaic device is verified.Studying the response of the tri-stable system at different equilibrium points of equal well depth to wake galloping,verifying the universality of the tri-stable system's influence on the power generation performance of the voltaic device,and providing a reference for the research of other types of voltaic devices.