Diffraction method for spar platforms

Abstract This paper presents the numerical hydrodynamic analysis for the motion responses of spar offshore platforms in regular sea waves using both Morison Equation and Diffraction Method. The spar was modeled as a rigid body with three degrees of freedom restrained by mooring lines affecting the...

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Main Authors: Ng , C.Y., Kurian, V.J., Mohamed , M.A.W.
Format: Conference or Workshop Item
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.1291 /
Published: 2009
Subjects:
TC Hydraulic engineering. Ocean engineering
TA Engineering (General). Civil engineering (General)
Online Access: http://eprints.utp.edu.my/1291/1/EN016-ICET_09-Carrol.pdf
http://eprints.utp.edu.my/1291/
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spelling utp-eprints.12912017-03-20T01:56:59Z Diffraction method for spar platforms Ng , C.Y. Kurian, V.J. Mohamed , M.A.W. TC Hydraulic engineering. Ocean engineering TA Engineering (General). Civil engineering (General) Abstract This paper presents the numerical hydrodynamic analysis for the motion responses of spar offshore platforms in regular sea waves using both Morison Equation and Diffraction Method. The spar was modeled as a rigid body with three degrees of freedom restrained by mooring lines affecting the stiffness values. Linear Airy wave theory and Morison’s equation were used for calculating the wave forces on the structure in the first case. The mass, damping and stiffness matrices were evaluated at every time step and the equations of motion were formulated for the platform dynamic equilibrium. The equations were solved using Newmark’s Beta time domain dynamic analysis method. The results were obtained as Transfer Functions in Surge. In the second case, the Transfer Functions were obtained using a linear diffraction Method. The results were compared and conclusions arrived at. It was observed that the responses using diffraction method were higher than that using Morison Equation for the low frequencies and vice versa for the high frequency. Keywords Spar platforms, Hydrodynamic analysis, Degree of freedom (DOF), Morison modified equations, Diffraction method, and Transfer function. 2009 Conference or Workshop Item PeerReviewed application/pdf http://eprints.utp.edu.my/1291/1/EN016-ICET_09-Carrol.pdf Ng , C.Y. and Kurian, V.J. and Mohamed , M.A.W. (2009) Diffraction method for spar platforms. In: 2nd International Conference on Construction Technology, 8-10 December 2009, Kuala Lumpur. http://eprints.utp.edu.my/1291/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
topic TC Hydraulic engineering. Ocean engineering
TA Engineering (General). Civil engineering (General)
spellingShingle TC Hydraulic engineering. Ocean engineering
TA Engineering (General). Civil engineering (General)
Ng , C.Y.
Kurian, V.J.
Mohamed , M.A.W.
Diffraction method for spar platforms
description Abstract This paper presents the numerical hydrodynamic analysis for the motion responses of spar offshore platforms in regular sea waves using both Morison Equation and Diffraction Method. The spar was modeled as a rigid body with three degrees of freedom restrained by mooring lines affecting the stiffness values. Linear Airy wave theory and Morison’s equation were used for calculating the wave forces on the structure in the first case. The mass, damping and stiffness matrices were evaluated at every time step and the equations of motion were formulated for the platform dynamic equilibrium. The equations were solved using Newmark’s Beta time domain dynamic analysis method. The results were obtained as Transfer Functions in Surge. In the second case, the Transfer Functions were obtained using a linear diffraction Method. The results were compared and conclusions arrived at. It was observed that the responses using diffraction method were higher than that using Morison Equation for the low frequencies and vice versa for the high frequency. Keywords Spar platforms, Hydrodynamic analysis, Degree of freedom (DOF), Morison modified equations, Diffraction method, and Transfer function.
format Conference or Workshop Item
author Ng , C.Y.
Kurian, V.J.
Mohamed , M.A.W.
author_sort Ng , C.Y.
title Diffraction method for spar platforms
title_short Diffraction method for spar platforms
title_full Diffraction method for spar platforms
title_fullStr Diffraction method for spar platforms
title_full_unstemmed Diffraction method for spar platforms
title_sort diffraction method for spar platforms
publishDate 2009
url http://eprints.utp.edu.my/1291/1/EN016-ICET_09-Carrol.pdf
http://eprints.utp.edu.my/1291/
_version_ 1741196049670733824
score 11.62408

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