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NUMERICAL AND EXPERIMENTAL STUDY ON MOTION RESPONSES OF SEMI-SUBMERSIBLE PLATFORMS SUBJECTED TO SHORT CRESTED WAVES

Kurian, V.J. and Ng , C.Y. and Liew, M. S. (2013) NUMERICAL AND EXPERIMENTAL STUDY ON MOTION RESPONSES OF SEMI-SUBMERSIBLE PLATFORMS SUBJECTED TO SHORT CRESTED WAVES. In: ICOVP2013 - International Conference on Vibration Problems, 9-12 Sep 2013, Lisbon. (In Press)

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Abstract

Keywords: Short crested waves, semi-submersible platforms, hydrodynamic analysis, wave tank tests, Response amplitude operator. Abstract. The effect of the short-crested waves on the motions of moored semi-submersible platform is demonstrated from the results of the model tests, compared with the theoretical calculations. The model tests were performed in the wave tank located in the Offshore Laboratory of Universiti Teknologi PETRONAS. In the tests, model was moored in the head sea with four linear springs fore and aft, and the motion responses subjected to multi-directional waves were measured. The responses in three degrees of freedom (surge, heave and pitch) are presented. A time domain numerical MATLAB code, incorporated with the short-crested wave effect was developed. In each time step, the mass, damping and stiffness matrices were calculated. The diffraction of short-crested wave force on circular cylinder was adopted, and the equation of motion was solved by the Newmark Beta method. Responses in term of Response Amplitude Operator (RAO) are presented and compared. Good agreement between numerical and experimental results was achieved.

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TC Hydraulic engineering. Ocean engineering
Academic Subject One:Academic Department - Civil Engineering - Structures, materials and construction
Departments / MOR / COE:Mission Oriented Research > Deep Water Technology
ID Code:10122
Deposited By: Prof Dr Kurian V John
Deposited On:25 Oct 2013 01:56
Last Modified:25 Oct 2013 01:56

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