Research On Design And Working Characteristics Of Cantilever Magnetostrictive Shock Vibration Collector

In recent years,with the development of low-power ultra-large-scale integrated circuit design and CMOS manufacturing,the power consumption of wireless sensor nodes has been continuously reduced,from the original mW level to W level.Wireless power supply and long-term power supply cannot be satisfied by traditional power supply methods.The problem of energy supply has become one of the important influences that restrict the promotion and development of electronic devices such as wireless sensors and wireless communication systems.Continuous or intermittent vibrations are widespread in actual production and life,such as cutting vibrations generated during the processing of parts,bumpy vibrations during vehicle travel,people walking,and bridge vibrations.The use of technical means to generate electrical energy from vibration in the environment will be one of the effective ways to solve the power supply problem of low-power electronic equipment.At the same time,it is also an important way to promote the concept of green environmental protection and low-carbon life.In this paper,a new type of functional material with two-way transduction effect,magnetostrictive material,is used to design a cantilever magnetostrictive shock vibration collector,and the related working characteristics are studied.This article takes the inverse effect of magnetostrictive materials as the theoretical basisand the metallographic structure of Fe-Ga is observed.A new film-based magnetostrictive material is used as the core element,which is optimized by ansys finite element analysis The distribution of the pre-magnetized field is determined,and the arrangement of the permanent magnets is determined.The experimental results verify that the experimental results are basically consistent with the simulation results;and the effect of the substrate size on the natural frequency and end displacement of the Fe-Ga alloy sheet is analyzed;The parameters were designed.Finally,the structure design of the magnetostrictive energy collector with the thin-film Fe-Ga as the core element was completed.In order to effectively use the energy under low frequency conditions,a frequency rise was developed The conversion mechanism converts the vibration at a low frequency into a system resonance of a few hundred hertz,making a magnetostrictive vibration collection device that generates electrical energy by absorbing high-frequency vibration energy converted from transient low-frequency vibration.According to the principle of electromechanical conversion of magnetostrictive materials,the constitutive relationship is derived,and the hysteresis model is introduced to establish the magnetization model of magnetostrictive materials.Based on the Jiles-Atherton magnetization model,the electromechanical coupling mathematics of transient excitation and vibration power generation is established.model.The power generation performance characteristics of Fe-Ga alloys with different sizes are compared and analyzed under transient excitation conditions.Under transient excitation,the effect of pre-magnetized field on power generation performance,the effect of external load resistance on power generation performance,power generation,power generation density,and the conversion efficiency of mechanical energy are explored.The cantilever beam of Fe-Ga alloy 0.5 × 13 × 35mm3 can reach 700 mV under the excitation of 1.96 N under the premagnetization field of three magnets;when the load resistance is 13 Ω,the power density of Fe-Ga alloy can reach98.81 mW / cm3,obviously superior to the power density of other materials and other devices.but the electromechanical conversion efficiency of the system is low,and the optimization design of the energy collector is still needed in the future research work.