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Precontrol of short-period motion for a Tension Leg Platform
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The Tension Leg Platform(TLP)is a hybrid,compliant platform designed to sustain springing and ringing responses that are correlated to short-period motion.Since the period of short-period motion is within the wave energy concentration region,TLPs may experience sensitive short-period motion,such as reso-nance and green water,that usually cause serious damage to TLPs.In this study,a precontrol methodol-ogy is presented as a solution to prevent TLP-sensitive short-period motion.By applying the precontrol methodology,the parameters of TLP can be predetermined,allowing TLP motion performance to meet the requirements of short-period motion before sensitive motions actually occur.For example,the damp-ing coefficient should be less than 4.3,the tendons'stiffness should be larger than 0.91 x 108,and the dimensionless draft should be less than 0.665.The development of a precontrol methodology is based on a solid theoretical foundation.First,a series of simple and high-fidelity numerical models are proposed to simulate the natural period of roll,natural period of heave,and green water height.Second,a constraint regime is generated based on the numerical models and the sensitive motion range of short-period mo-tion.The constraint regime is divided into two parts:the control range(corresponding to sensitive short-period motion)and the feasible range(the complementary set of control ranges in the whole parameter constraint domain).Finally,TLP parameters are derived from the calculated feasible range.The precontrol methodology goes beyond the conventional approach of real-time control by changing the control from a remedial action to a preventive action.
PrecontrolConstraint regimeShort-period motionTLP
Hao Wu、Yan Lin、Yongxi Wu
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School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China
Department of Naval Architecture,Dalian University of Technology,Dalian 116023,China
State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116023,China
School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China
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