Research On Underwater Autonomous And Efficient Wireless Charging System For Unmanned Underwater Vehicles (UUV

In the last several years,the exploration,development and utilization of China’s Marine resources have become more and more advanced.The strategy of promoting China to become a Marine power has become an important part of building a socialist country in the new era.Unmanned underwater vehicles(UUV)have been applied to underwater mineral monitoring and military reconnaissance because of their advantages in security and intelligence.However,limited by the density of the power cell structure,the current UUV usually has limited power,small cruise range and other defects.Wireless power transmission(WPT)is expected to solve the development dilemma of UUV because of its convenience,high security and reliability.Therefore,this paper mainly aims at the convenient underwater wireless charging technology to expand the cruise range of UUV.The main research work is as follows:1、 In view of the problem that UUV is difficult to stay away from the base operation in the traditional manual salvage and wet plug mode,this paper creatively proposes to use the unmanned ship with greater energy carrying wireless charging and transmission structure as the "parent" of UUV,so as to provide flexible power supplement and stay away from the base operation.2、The attenuation characteristics and eddy current loss of electromagnetic wave in seawater were analyzed and deduced.The equivalent resistance of seawater loss was introduced into SS compensation network,and analyze the relationship between transmission power and efficiency and mutual inductance,system frequency and other parameters.3、The wireless energy transmission circuit of the two coils is designed,and the circuit design scheme of each module is presented.Phase shift control is introduced to solve the dead zone problem caused by the unsatisfactory switching tube characteristics of the inverter circuit.In particular,in order to ensure the system security and avoid interference,this paper proposes the original secondary side authentication mechanism.The verification process includes the original edge Hall induction and the reverse data transmission.In view of the difficulty of underwater wireless communication,the energy and signal time-sharing transmission scheme based on coupled coil multiplexing is proposed.4、In view of the failure problem of single UUV,a multi-UUV rescue plan is proposed.Compare the original and secondary edge structures,and replace the H bridge inverter circuit with bidirectional inverter to realize bidirectional energy transmission.The concept of magnetic beamforming is proposed according to the beamforming technology in wireless communication.A improved particle swarm algorithm is used to optimize the magnetic field distribution and improve the energy transport efficiency.5、The circuit model was built to verify and analyze the underwater wireless charging of two coils,and the output waveform of the high-frequency inverter is tested.Then we test the transmission power and efficiency of the system in the three coupling states,and show that the wireless energy transmission can reach 70% in the critical coupling state.By modeling and analyzing the multi-coil transmission system in COMSOL,the experimental results show that the improved particle swarm algorithm can effectively improve the magnetic beamforming effect and improve the transmission efficiency of the system.