| Semi-submersible platforms have been widely used in deep-sea oil and gas development because of their good stability and multi-functional operations.Under severe sea conditions,semi-submersible platforms are easy to slamming attacks and overtopping waves that affect the safety of the platform.Therefore,the air gap problem of semi-submersible platforms is getting more and more attention.In this paper,the distribution disciplinarian of the platform air gap in the coupling of platform motion and wave motion is studied by numerical simulation method,and an improved scheme is proposed to improve the safety of the semi-submersible platform.Firstly,based on the theory of potential flow,AQWA software was used to analyze the semi-submersible platform in frequency domain and time domain.The waves of different angles and different frequencies were considered respectively,and the hydrodynamic coefficients of the platform and the motion responses of the respective degrees were obtained.Through the statistical method to study the results of the motion response,it is found that the heave motion of the platform has a greater impact on the air gap response of the platform.Secondly,coupled the wave motion and the platform motion,the air gap response of the platform was analyzed.The distribution of air gap on the platform is studied,and the Weibull probability model of the air gap response extreme value is obtained.The air gap of the platform can be predicted.Finally,the air gap response of semi-submersible platforms with different types of columns was analyzed.An improved device for reducing wave climbing was designed.The influence of the device on wave climbing and air gap response was studied.It was found that the device can effectively reduce the direct attack of the wave on the platform and improve the safety performance of the platform. |
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