Numerical Study On Airgap Response Of Triangle Tension Leg Platform

With the offshore energy being gradually depleted,people began to look into the deep sea ocean.The traditional gravity platform and the jack-up platform no longer meet the needs of human development.The better performance of the floating platform makes it develop for mankind Deep-sea resources to provide protection.Deep sea bad environment Compared with the offshore environment even worse,in order to ensure that the platform can be safe and stable operation,we hope that all types of platform deck can be maintained above sea level,so as to avoid the wave impact to the deck,to prevent equipment on the deck Be damaged,while ensuring the safety of staff.In the floating platform,due to its good sports performance and ability to withstand the harsh marine environment,the tension leg platform is closely watched by industry professionals in deep-sea resource development.Based on the project "Design and Construction and Application of Triangular Multi-function Tension Leg Platform",the designed model of triangular tension leg platform is taken as the research object,the airgap response characteristics of the platform are studied by using the boundary element method.The main research work of this paper includes the following aspects:(1)In the frequency domain,the platform is analyzed by SESAM software in this paper.mainly to calculate its additional mass as well as the potential flow damping,first-order wave force,and second-order wave force mainly calculated.The magnitude of the platform motion responseof tendon forces are discussed under action of the second-order forceRAO.(2)In the frequency domain,the free surface motion characteristics of the platform are calculated.The comparison and analysis of the extreme values of wave height increase were completed.the wave run-up around the four vertical columns,the wave distribution characteristics within the platform,the wave vevlation response and the vertical displacement response of the platform.(3)In the time domain,the movement of the platform and the increase of the wave surface under the joint action of wind?waves and current are discussed.Specific discussion of different incident wave angle the first and second-order wave response,the air-gap response under the conditions of the platform mooring and the fixed state are analysised in detailed.Further,air-gap response of the platform under four ture sea conditions are simulated and the performance of air-gapresponse is evalued.By numerical predicting the air gap response of triangular tension leg platform and calibrating with the related specifications,the conclusion is that the design of triangular tension leg platform is reasonable.