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Dynamic analysis for normal and inclined tether Tension Leg Platforms

Abbass Mohieldeen, Mohammed Abuelgasim (2008) Dynamic analysis for normal and inclined tether Tension Leg Platforms. Masters thesis, Universiti Teknologi Petronas.

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Abstract

Tension leg platform (TLP) is a type of compliant offshore structure where its excess buoyancy over the weight produces pretension in the tethers connecting the hull to the seabed. TLP technology preserves many of the operational advantages of a fixed platform at the same time reducing the cost of production in deep water. Its production and maintenance operations are similar to those of fixed platforms. TLP combines the initial cost-saving benefits associated with floating production system with the operational benefits attributed to the fixed platforms. The dynamic responses of TLP such as the motions and the tether tensions when it is subjected to wave forces are needed for the design and maintenance of the structure. The amplitudes of motion responses must be within permissible limits to prevent flexural yielding of the drilling risers which connect the platform to the sea bed completion template. Limiting these responses leads to better stability and safe drilling operations. In this study, a MATLAB computer program was developed for determining the dynamic responses of rectangular, triangular and inclined-tether TLPs subjected to random waves. The platform was considered as a rigid body and all the six motions were determined. The hydrodynamic drag and inertia coefficients at each point on the platform were revised after each time step. Second order wave theory and Modified Morison equation were used for wave force calculations. Newmark Beta Method of time domain analysis was used for the dynamic analysis. The response amplitude operators (RAO) for typical square TLPs were compared with available theoretical results. The inclined-tether stiffuess matrix was developed, using which the responses of inclined tether square TLP under regular and random waves were determined. Also, parametric studies were made varying parameters such as water depth, pretension, wave angle and position of CG. The inclined-tether square TLP results were compared with the results for the square and triangular TLPs. The results proved the capability of the developed programme in predicting the responses. The results also indicated that the square TLPs performed much better compared to triangular TLPs under random waves. The parametric studies highlighted the remarkable change in platform responses caused by changing the above mentioned parameters. It was also shown that the inclined-tether square TLP had better performance compared with vertical-tethered rectangular and triangular TLPs.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Civil Engineering - Structures, materials and construction
Subject: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering > Civil
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/8287

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