Design And Characteristic Analysis Of A Magnetostrictive Tristable State Vibration Collection System

In recent years,many researchers have begun to attach importance to the application of micro electronic devices.However,micro electronic devices usually are used for traditional chemical batteries for power supply at present,which have very limited storage capacity and can not provide long-term independent power supply for devices.Moreover,disposing of waste chemical batteries can also cause environmental pollution.Moreover,the most micro electronic devices are installed in precise and difficult to disassemble locations.Therefore,it is an ideal way that discarded vibration energy is collected by using a vibration harvester in nature,which provides energy for micro electronic devices.Recently,many domestic and foreign researchers have begun to focus on the collection and application of vibration energy,and many research results have been widely applied.In order to better adapt and apply the harvester to vibration in practical environments,a magnetostrictive tristable vibration harvester is designed.The tristable structure is introduced into the traditional harvester to form three stable equilibrium states,which effectively improves the output capacity of the system.Firstly,the optimal fixation method for the thin film is established,which follows the selection of coil turns.Then,by analyzing the structure and characteristics of magnetostrictive monostable and bistable states,a magnetostrictive tristable vibration collection system is proposed.Through dynamics simulation analysis of system potential energy,nonlinear magnetic force between permanent magnets,the influence of different permanent magnet spacing on the output characteristics of the tristable vibration harvester is clarified.The influence of system parameters is analyzed on the potential energy function in the tristable state,including research on the range of parameter values and the study of the depth of potential energy wells affected by parameters.The influence of the motion of the permanent magnet on the tristable vibration harvester is ruled out through experiments.Subsequently,the monostable,bistable,and tristable structures are tested by changing the distance between the permanent magnets.The results shows that at an acceleration of6.272m/s~2,the tristable resonance frequency is 23Hz and the peak voltage is 568m V.Compared to the traditional magnetostrictive monostable collection system,it increases by about 10 times,and the resonance frequency significantly decreases than before.Compared to the bistable structure,its output voltage also increases by 2 times.When the distance between the free end and the fixed end permanent magnet is 10mm,and the distance between the fixed end permanent magnet is 16mm,the voltage output effect is optimal.Subsequently,by introducing a bias magnetic field,the voltage significantly increases to 868m V.Through simulation analysis and experimental research,the magnetostrictive tristable vibration harvester is proposed in this paper can effectively increase the coupling between its resonance frequency and the surrounding environment frequency,thereby further improving its vibration collection ability.