Research On Power Matching Of Buoyancy Engine Of Underwater Glider

The underwater glider is a new type of mobile platform of marine observation and detection,which can efficiently perform long-time,large-scale and three-dimensional continuous tasks of collect marine environment information in the deep sea,so it is widely used in fields of military exploration and marine survey.The underwater glider realized its self-saw gliding movement mode through buoyancy driving and attitude adjustment,which has the advantages of low energy consumption and high endurance.Compared with the well-developed underwater gliders in foreign countries,domestic gliders still have great potential for development in terms of endurance and energy consumption.The buoyancy engine of underwater glider occupied the largest amount of energy in total energy consumption inside,so the energy-saving of the buoyancydriving system is the decisive factor to improve the duration and gliding range of underwater glider further,and it also has great significance to expand its application range.In this paper,takes the buoyancy driving system of the underwater glider developed by Tianjin University as the main research object,aims to improve the system energy-efficiency,studies the relationship between operating parameters and system energy-efficiency,and establishes the energy-efficiency model of the buoyancy driving system under the influence of the external working environment.The model can give the optimal efficiency of the buoyancy driving system and corresponding key parameters under different working conditions to ensure that the underwater glider can achieve its own buoyancy adjustment within the range of high efficiency.The research results will provide theoretical guidance for the design of underwater glider buoyancy driving system working at different depths.The main research contents and results of this paper are as follows:First of all,according to the working characteristics of the buoyancy engine of the underwater glider,the motor and piston pump,as the main components of the buoyancy engine,were analyzed by power matching and energy loss characteristics in the actual working process.Mathematical models of energy consumption and efficiency characteristics of brushless DC motors and high-pressure axial piston micropumps based on the form of power matching were es Tablelished respectively,and the operating parameters that affect the energy-efficiency of motors and piston pumps were analyzed.Then,based on the actual working environment of the underwater glider,the model of seawater pressure and temperature was es Tablelished,fully considering the influence of external environmental factors on the working performance of the buoyancy-drive system,and on this basis,the pump-motor energy efficiency matching model was establelished,and the accuracy of the energy-efficiency model was verified by experimental data.According to the nonlinear characteristics of the model,the Genetic algorithm was used to optimize the energy-efficiency of several different underwater glider buoyancy engine in the "Petrel" series,and the optimal values of the corresponding parameters were obtained.At the same time,the optimal efficiency of the buoyancy driving system at the typical working depth of several underwater gliders was solved,and the corresponding results were obtained.At the same time,by comparing with experimental data and BP neural network,the optimization results were verified.Finally,the overall simulation model of the axial piston pump-motor driving module is es Tablelished based on AMEsim,carried out the dynamic simulation of the system,finally the feasibility of the optimization results is verified by analyzing the output pressure-flow curve.