Wave Energy Harvesting Based On Magnetostrictive Material

Energy is a demand in our daily life and a way to improve human development,promote economic growth and productivity progress.With the rapid progress of science and technology and the shortage of fossil energy,more and more countries have increased the development and utilization of marine energy.In the development and utilization of marine resources,marine wireless sensor network monitoring technology plays an important role,but With the development and application of marine wireless sensor network technology,problems such as difficulty in energy supply,high costs,and restricted chemical battery working cycles are the main problems that limit its development.Therefore,based on the core material Galfenol sheet,a wave energy harvesting device with small size and wide distribution is designed in this paper.The main research contents include:1.The research status of large and small wave energy harvesting devices at home and abroad is analyzed,and the main wave energy harvesting methods are obtained.Through the comparative analysis of large and small wave energy harvesting techniques,the magnetostrictive energy harvesting technology is finally selected for overall scheme design and analysis.2.According to the classification and application scope of wave theory,the wave condition elements in the sea area near Chudao are analyzed,and the linear wave theory is used for modeling and analysis.The calculation equations of wave velocity,acceleration and wave force are derived based on the linear wave theory.The three wave conditions of the maximum,minimum and average wave heights in the sea near the island establish wave surface equations respectively.3.According to the design scheme of the wave energy harvesting device,the overall structure of the wave energy harvesting device is determined,and the annular energy harvesting mechanism,bottom shell,sealing cover,floating plate and gravity anchor in the device are designed and analyzed.At the same time,the annular energy harvesting mechanism is optimized and analyzed by using software such as ANSYS workbench and Maxwell.4.The characteristics of magnetostrictive material are explained.Based on the J-A hysteresis model,the electromechanical coupling model of Galfenol sheet is established,and the dynamic equation of the device is established.The dynamics simulation analysis of Galfenol sheet is carried out by ANSYS software,and the variation law of its shape variable is determined.Combined with the electromechanical coupling model of Galfenol sheet,the mathematical model of wave energy harvesting device is obtained,and the corresponding induced voltage variation curve of the device under three wave conditions is obtained by simulation calculation.5.The manufacture of the prototype,the design of the experimental mechanism and the corresponding experimental platform are carried out to verify and analyze the dynamic simulation results of the Galfenol sheet and the mathematical model of the wave energy harvesting device.The experimental results show that the error between the dynamics simulation results and the experimental results is less than 7%,and the error between the theoretical value and the experimental value of the mathematical model of the wave energy harvesting device is about 15%.The validity of the mathematical model of the device is verified.