Research On The Shape Optimization Design Method Of Deep-Sea Preset Floating Platform

The deep-sea preset system is an innovative underwater bar system,which has the functions of deep-sea concealment and lurking,long-term low-power duty,long-distance reliable wakeup,rapid and stable floating,multi-load general launch.Significance and wide-reaching prospects render it a frontier hotspot of research,both domestically and internationally.In this paper,aiming at the core problem of rapid and stable floating of deep-sea preset platform,based on the existing theory and method of hydrodynamic shape research of underwater unmanned aerial vehicle,aiming at the characteristic of large scale,no power,low resistance and high stability of preset platform,the optimization design method of deep-sea preset floating platform is studied.The main research contents and achievements are as follows:1.A thorough examination of the theory and technique of shape formation for underwater vehicles has been conducted,and a mathematical representation of platform form is established by employing two-parameter elliptical line form and taking into account the pre-set platform size and floating as restrictions.2.The theory and calculation method of the flow field around the underwater vehicle are deeply studied,and the calculation method and model of potential flow field of the preset platform are established by panel method.On the basis of analyzing the prediction methods of different switching points,the prediction method and model of the platform are established by Granville method,and the calculation method and model of the turbulent boundary layer of the platform are established by momentum integral method.Finally,the calculation model of the floating resistance of the preset platform is established by surface integral method.3.In-depth study on the shape optimization of underwater vehicle,aiming at the multivariable,multi-constraint and nonlinear characteristic of the preset platform,the shape optimization method and calculation model of the deep-sea preset platform are established by using genetic algorithm,and the optimal low-resistance shape of the platform is obtained by using MATLAB.4.The theory and method of computational fluid dynamics are deeply studied,and the Reynolds average equation is used to solve the time-averaged field around the preset platform.By comparing the calculation results of several groups of grids,the CFD calculation value of the platform resistance coefficient under the optimal grid is obtained.5.The hydrodynamic parameters of the pre-set floating platform were gauged through the hydrodynamic assessment of the scale model and the full-scale prototype on the lake,and the accuracy of the calculation was superior to 11%,confirming the efficacy of the flow field calculation technique in deep sea and the shape optimization design technique.