Design And Experimental Research Of Underwater Reconfigurable Drive Unit Based On Piezoelectric Jet

With the expansion of the population and the scarcity of terrestrial space and resources,the exploration of marine space and resources are becoming more and more important.The underwater vehicle is an important tool to explore the deep-sea environment and underwater operation,and the first requirement for deep-sea exploration is the ability to withstand high pressure.In this paper,a drive unit with high pressure resistance is designed based on the principle of the piezoelectric jet,which can be reconstructed into different shapes to complete multiple functions and meet the needs of different underwater operations.Firstly,the traditional propulsion mode of underwater vehicle is discussed,and its shortcomings are analyzed.Different swimming modes of underwater organisms are briefly discussed,in which jet drive has many advantages,and the research status of underwater jet drive technology at home and abroad is studied and analyzed.In this paper,the research direction and purpose of the subject are defined,and the main research content of the subject is introduced in detail.The modal and equivalent circuit of the piezoelectric vibrator of the piezoelectric jet excitation source are analyzed and explained.The structure of the driving unit is preliminarily designed based on the principle of piezoelectric jet,and the mechanism of piezoelectric jet driving is briefly analyzed.The working process of the driving unit is simulated and analyzed by the two-way fluid-solid coupling using ANSYS software,and the driving force of the drive unit was extracted.Then the main parameters of the driving unit are optimized by orthogonal experiments on account of the simulation results,and the optimization results of the orthogonal experiments are verified,the optimal combination of structural parameters is determined to improve the driving force output by the driving unit.The driving performance and anti high pressure performance of the driving unit are experimentally studied.Firstly,the optimal operating frequency range of the driving unit in air and water is determined by a combination of simulation and experiment.The experimental research on the driving force of the driving unit is carried out,and it is measured through the experiment and compared with the driving force extracted by simulation,besides,the reasons for the difference between the two methods are analyzed.The experimental research on the influence of different excitation signals on the driving force,motion speed,power consumption and energy conversion efficiency of the driving unit was carried out.Through the high pressure experiment,the anti high pressure performance of the drive unit is verified.In order to realize the diversification of functions,the structure of the drive unit has been improved so that it can be combined with other drive units into various forms.Two reconstruction forms of the drive unit are proposed,namely three-module reconstruction and six-module reconstruction.The motion forms realized by the two kinds of reconstruction in different configurations are analyzed and experimentally verified,and the influence of the voltage amplitude and frequency of the excitation signal on the motion performance of the two kinds of reconstruction in different configurations are carried out.The functions of the two reconstruction forms are verified through experiments.