Analysis on Motion and Cable Dynamic Tension for An ALT-Tanker System |
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| Authors: | LI Hong-xia TANG You-gang LIU Li-qin ZHANG Ruo-yu School of Civil Engineering Tianjin University Tianjin China |
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| Institution: | School of Civil Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | A two-degree freedom model for an ALT-tanker system is established corresponding to the pitch of the ALT and the surge of the tanker.Tension in the mooring cable between the ALT and the tanker is represented by an unsymmetrical,piecewise-nonlinear function.Wave load on the tower is evaluated by use of the Morison equation.The first order wave load acting on the tanker is calculated by the linear diffraction theory based on the 2-D Helmholtz equation,and the near field approach of Pinkster is used to evaluate the second order drift force.The dynamic equation of motion is established based on the principle of D'lembert.Dynamic response and cable tension of a mooring system composed of an 88.4 m ALT and a 100000 t grade tanker are calculated.The influence of wave frequency,wave excitation amplitude,wind and current force on ALT-tanker motion and cable tension is discussed. |
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| Keywords: | ALT-tanker system piecewis-nonlinear wave diffraction cable tension slow drift oscillation subharmonic oscillation |
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