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1500 m water depth tension leg platform motion and mooring Numerical and Experimental Study

Author: HuangJia
Tutor: XiaoLongFei
School: Shanghai Jiaotong University
Course: Naval Architecture and Ocean Engineering
Keywords: Tension Leg Platform Vertical tension mooring system Model test Numerical Simulation
CLC: U661.7
Type: Master's thesis
Year: 2012
Downloads: 92
Quote: 0
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Abstract


Tension leg platform (TLP) is currently the most common deep-sea oil and gas development in the form of one of its heave motion, suitable for water depths ability to resist adverse sea conditions, with a high price. South China Sea, rich in oil resources, and TLP is more suitable for use in the South China Sea into use in the current to the deep into the trend of tension leg platform-related research has important practical significance this paper, a working depth of 1500m tension Leg Platform numerical analysis to study the tension leg platform hydrodynamic performance. TLP established numerical model, based on three-dimensional potential flow theory to calculate the frequency domain to obtain added mass, damping, first-order and second-order wave excitation forces difference frequency power transfer function, as well as platform six modal motion response amplitude operators and other hydrodynamic parameters. The subject of the platform and mooring system in time domain coupling calculation, according to the time domain frequency domain transfer methods when solving differential equations, get platform in response to different sea conditions, hydrodynamic performance analysis platform. TLP test carried out in the deep pool of hydrodynamic performance of full-scale scale model test, developed to form tension mooring system simulation technology. Calculated by the model test and comparing the results found that TLP vertical swing, sway motion is mainly characterized by low-frequency response; heave movement was the direct impact of horizontal movement, in the performance of the wave frequency characteristics at the same time show more low-frequency characteristics; pitching and roll motion is mainly characterized by wave frequency and high-frequency characteristics, its movement amplitude greater than the experimental values ??calculated value, indicating that high-frequency motion numerical method deficiencies. TLP's yawing motion is also of concern, as was centrosymmetric platform at 180 °, and 225 ° angle of the bow wave to shake the calculated value is very small, and in the model test has detected a more significant yawing movement. This phenomenon is due to the different tension leg stiffness between the asymmetry caused the error, but also illustrate the value of the environment and yawing conditions are more sensitive to their own systems. The TLP mooring system characteristics were studied. For vertical tension mooring system particularity, proposed a simple mooring system for rapid calculation method of calculating static characteristics. This method is considered a platform for coupling the vertical offset horizontal offset caused by the unit on the mooring line static equilibrium equations solved by integrating the calculated results are in good agreement with the experimental results compared. Finally, to further determine the TLP platform motion mechanism, designed two sets of rules-wave test, the control variable method to study the wavelength, the wave height of the platform motion response.

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