Numerical Study On Stability Of Offshore Launch Platform Under Impact Load And Wave Action

In order to ensure the safety of sea launch platform under the action of waves and the impact of rocket launch load on the stability of sea launch platform.The rolling motion state of the launch platform was investigated by applying impact force to different lateral deviation distances.The width and wave Angle of the offshore launch platform were changed to verify the factors affecting the stability of the platform motion.Different launch time points were set under the action of waves to explore the effect of launch phase on the motion of the offshore launch platform.STAR-CCM+software is used for simulation calculation to make up for the defects of high cost and long time in physical test.In this paper,numerical simulation software STAR-CCM+ fluid module is applied to carry out numerical research on the stability of offshore launch platform under impact load and wave force.The contents are as follows:(1)By reading domestic and foreign literature,the research status of offshore launch platform is analyzed,and the future development trend of offshore launch platform,as well as the factors affecting the movement of offshore launch platform are summarized.(2)Based on the software simulation,the numerical pool is established.By verifying the mesh size and the length of the wave elimination area,the most appropriate three-dimensional numerical pool is found out.The difference between the simulated value and the calculated value is compared and analyzed,and the independence of the three-dimensional numerical pool is verified,laying a good foundation for the subsequent test.(3)The Yellow Sea offshore launch platform is the original model,and the mathematical model is established according to the scale of 1:1.The historical curve of the rolling motion of the offshore launch platform is compared and analyzed.The research shows that the amplitude of the rolling motion of the platform increases with the increase of the lateral offset,and the draft has little effect on the rolling motion of the platform.(4)By simulating the motion state of offshore launching platforms with different widths under the action of wave force,it can be known that the rolling and heaving motion of the platform increases with the increase of platform width;The pitching motion decreases with the increase of platform width.By simulating the motion state of different waves to the platform,it can be obtained that the rolling motion amplitude of the platform increases with the increase of wave direction angle;The amplitude of pitching motion of the platform decreases with the increase of wave angle;The heave motion of the platform is almost unaffected by the wave direction angle.(5)Based on the analysis of the impact load and wave force on the stability of the platform,the motion state of the offshore launching platform with three degrees of freedom of rolling,pitching and heaving is explored under the joint action of the two forces,and the influence of launching time on the stability of the offshore launching platform is verified.