Research On Optimization Design Of Pontoon Of Marine Satellite Launch Platform

In the process of rocket launching at sea,there are high requirements for the motion performance of the offshore platform.When the rocket is launched,the swing motion generated by the platform will make the satellite in a more dangerous launching state.It is an urgent problem to improve the attitude maintenance ability of the platform in the marine environment.Therefore,this thesis studies the motion performance of marine satellite launch platforms,mainly for marine launch platforms with different shapes of pontoons,and discusses the optimal design scheme of the pontoons.The main work of this thesis is as follows:(1)The research status of the numerical wave tank and offshore platform,hydrodynamic performance,and motion response of the offshore platform is reviewed.At the same time,based on the theory of hydrodynamic analysis,the basic theory and research methods involved in this thesis are briefly introduced.(2)Establishing a three-dimensional numerical wave tank,and regular waves are generated based on the push plate wave method.The concurrent analysis of grid division,time step,and the length of the wave elimination zone is carried out in the numerical tank.The numerical simulation results are compared with the theoretical values to test the model’s accuracy in this thesis.Finally,the setting scheme of the three-dimensional numerical wave tank is obtained.(3)The numerical model simulation test is carried out for the motion test data of the deep draft semi-submersible platform and the C-type tank sloshing model test data.The simulation results are compared with the test values in the literature to verify the reliability of the numerical method for the analysis of complex shape models and tank sloshing problems.(4)The launch platform models of four different shapes of pontoons are established,and their motion responses under different wave directions are analyzed.Then,the shape of the platform pontoon is optimized in the process to obtain a pontoon with better motion performance.On this basis,the influence of the liquid loading rate of the pontoon tank on the motion performance of the platform is studied,which provides a reference for the selection of pontoons for subsequent marine satellite launch platforms.(5)This thesis writes the reverse thrust function during the rocket launch.The motion response of four kinds of pontoon liquid loading rate marine satellite launch platforms under impact load is analyzed.The motion response of the platform under static water conditions and wave conditions is compared and studied.Finally,the influence of the pontoon liquid loading rate on the motion response of the platform during the launch is obtained.