Dynamic Analysis Of Raindrops Impacted Piezoelectric Cantilever Power Generation System

For the problem of energy shortage,people have been seeking solutions.The use of environmental vibration for self-powered microelectronic devices has been favored by many researchers,especially for piezoelectric structure traps.The piezoelectric structure is simple and easy to achieve bistable and multi-steady state,which is more conducive to improving the efficiency of power generation.In life,there are many forms based on environmental vibration,and it has proven to be feasible to convert the kinetic energy of raindrops into electrical energy through the device.At present,the research on the energy capture of raindrops kinetic energy basically uses the raindrops to impact the piezoelectric material to achieve the power generation effect,which not only requires a large area of piezoelectric material,but also greatly reduces the energy collection efficiency,thereby failing to meet economic requirements.Therefore,the bistable piezoelectric cantilever power generation system is used for the collection of raindrops energy,which has become a new research direction.In this paper,the bistable piezoelectric cantilever beam power generation system is taken as the research object.The e ffects of raindrops parameters and structural parameters on the output characteristics of power generation systems are studied by numerical calculation and experimental methods.This study will be based on raindrops impact and bistable The design and application of the piezoelectric cantilever beam power generation system will be instructive.The main research work of this paper includes the following aspects:1.The piezoelectric power generation is comprehensively summarized,mainly the research status,research progress and research results of the bistable piezoelectric power generation system.The nonlinear characteristics of the bistable structure are explained in detail.In addition,the research status of raindrops energy collection by domestic and foreign researchers is highlighted.2.A model of bistable piezoelectric cantilever piezoelectric system is established.The dynamic equation of the system is established by using Newton's second law.Since the magnetic force is an important factor in the nonlinear characteristics of the system,the magnetic model between the two permanent magnets is also established in the process of establishing the system model.In addition,the process of impacting the rain beam on the piezoelectric beam is established as a rectangular pulse excitation model,which facilitates the next study.3.The MATLAB software is used to numerically solve the dynamic equations of the system.The output voltage curve and the system motion phase diagram of different raindrops diameters are obtained.The results show that the larger the raindrops diameter,the easier the system is to cross the barrier at two equilibrium points.Make a big move between them.In addition,under the continuous raindrops impact,the system output efficiency will increase significantly with the increase of the raindrops diameter.At the same time,the influence of different magnet spacing on the output efficiency of the system is studied.The research shows that the output of the system will show the best state if the pitch of the magnet is within a suitable range.4.Through the numerical simulation,the dynamic characteristics of the system under different rainfall intensities are studied.According to the simulation curves of the system under different rainfall intensities,the greater the environmental rainfall intensity,the easier the system is to make large movements,and the deformation of the piezoelectric beam is greater.The power generation is better.5.A bistable piezoelectric cantilever-type energy harvester structure was designed and a test platform was built.By comparing experimental results and theoretical results,the raindrops diameter,magnet spacing and cantilever beam thickness were analyzed for the output response of the bistable system.Through the above research work,the feasibility of using bistable piezoelectric cantilever power generation system to collect raindrop kinetic energy is verified.The dynamic characteristics of the system and the laws affecting the system large motion are obtained comprehensively.The theoretical and experimental basis for the energy capture method is provided,which provides a guiding basis for its structural design.