Research On Electromagnetic And Piezoelectic Composite Wave Energy Generation Technology

While traditional fossil energy has made great contributions to the advancement of human civilization,it has brought serious environmental problems such as global warming.Clean renewable energy sources are on the horizon.The ocean contains tremendous energy.As an extremely important part of the earth sciences,marine science has shown increasing value.As humans use the energy and means of production in the ocean more and more extensively and in depth,more and more scientific monitoring equipment such as marine buoys and marine detectors are used.The reduction of power supply costs is very important.The solution is of great significance for ensuring the reliable and continuous operation of microelectronic systems such as sensing and communication inside the equipment.(1)Analyze the vibration characteristics of waves and design the wave generator structure.Based on the low-frequency and low-amplitude vibration characteristics of offshore wave energy,a wave energy power generation device was designed using permanent magnets and piezoelectric ceramics.At the free end of the metal cantilever beam,a concentrated mass is added to convert the linear vibration of the wave into the swing of the cantilever beam,which can amplify the small amplitude of the input vibration to a certain extent and improve the efficiency of energy harvesting.In order to prevent the cantilever beam from bending excessively and monitor the state of wave vibration,based on the principle of contact electrification,a limit sensor is designed with a flexible polymer.(2)Mathematical analysis and model construction.The mathematical model of the cantilever beam system is established,and its frequency equation is written according to the Euler-Bernoulli formula of the slender beam.The natural frequencies of different concentrated masses and metal beam thicknesses are found so that the natural frequency of the system is similar to the wave vibration frequency.(3)Finite element simulation of the dynamic characteristics and electromagnetic field distribution of the power generation device.The finite element simulation of the dynamic characteristics of the wave power generation device is performed to analyze the motion characteristics of the elastic pendulum under the excitation of waves with multiple amplitudes and frequencies.The stress distribution and potential distribution of piezoelectric ceramics under the large-scale lateral deformation of cantilever beams were studied,and the relationship between output characteristics and frequency and load was studied.The finite element analysis of the magnetic field distribution was conducted to study the influence of parameters such as air gap and permanent magnet size on the output voltage.(4)Set up an experimental platform and make prototypes for experimental research.A wave power generation device was fabricated using an aluminum alloy shell,a manganese steel beam,a neodymium iron boron permanent magnet,and PZT.The wave was simulated on an electric vibration table for testing.The test results are compared with the calculated results,indicating the correctness of the theoretical analysis.The experimental results show that the output power of the power generation device can meet the power demand of marine equipment such as buoys.