Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory

Diffraction theory are the common theories used to evaluate the wave force for offshore structures. The applicability of these theories is based upon the type and size of the member of the structures. Morison equation is normally used for small structures compared to wave length, while for large...

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Main Authors: Kurian, V.J., Ng , C.Y., Liew, M. S.
Format: Conference or Workshop Item
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.8343 /
Published: 2012
Subjects:
TC Hydraulic engineering. Ocean engineering
TA Engineering (General). Civil engineering (General)
Online Access: http://eprints.utp.edu.my/8343/1/ICSSBE2012-DrKurian.pdf
http://eprints.utp.edu.my/8343/
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spelling utp-eprints.83432017-03-20T01:59:28Z Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory Kurian, V.J. Ng , C.Y. Liew, M. S. TC Hydraulic engineering. Ocean engineering TA Engineering (General). Civil engineering (General) Diffraction theory are the common theories used to evaluate the wave force for offshore structures. The applicability of these theories is based upon the type and size of the member of the structures. Morison equation is normally used for small structures compared to wave length, while for large structures Diffraction theory needs to be applied. However, in many cases Morison equation has been used to obtain the wave forces for classic spars, which are large offshore structures installed in deepwater. This paper presents the results of numerical investigation of an offshore classic spar platform subjected to long crested waves. Two numerical simulations were developed by incorporating the Morison equation and Diffraction theory to obtain the wave forces. The classic spar was modeled as a rigid body with three degrees of freedom restrained by mooring lines. In the simulation, the mass, damping and stiffness matrices were evaluated at every time step. The equations of motion were formulated for the platform dynamic equilibrium and solved by using Newmark Beta method. The results were obtained in terms of Response Amplitude Operator (RAO) for surge, heave and pitch motions. The dynamic responses obtained were compared. Keywords-Classic spar, Morison equation, Diffraction theory, Response Amplitude Operator (RAO). 2012-09 Conference or Workshop Item PeerReviewed application/pdf http://eprints.utp.edu.my/8343/1/ICSSBE2012-DrKurian.pdf Kurian, V.J. and Ng , C.Y. and Liew, M. S. (2012) Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory. In: ICSSBE 2012 (International Conference on Statistics in Science, Business and Engineering 2012), 10-12 Sep 2012, Langkawi. http://eprints.utp.edu.my/8343/
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)
Kurian, V.J.
Ng , C.Y.
Liew, M. S.
Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory
description Diffraction theory are the common theories used to evaluate the wave force for offshore structures. The applicability of these theories is based upon the type and size of the member of the structures. Morison equation is normally used for small structures compared to wave length, while for large structures Diffraction theory needs to be applied. However, in many cases Morison equation has been used to obtain the wave forces for classic spars, which are large offshore structures installed in deepwater. This paper presents the results of numerical investigation of an offshore classic spar platform subjected to long crested waves. Two numerical simulations were developed by incorporating the Morison equation and Diffraction theory to obtain the wave forces. The classic spar was modeled as a rigid body with three degrees of freedom restrained by mooring lines. In the simulation, the mass, damping and stiffness matrices were evaluated at every time step. The equations of motion were formulated for the platform dynamic equilibrium and solved by using Newmark Beta method. The results were obtained in terms of Response Amplitude Operator (RAO) for surge, heave and pitch motions. The dynamic responses obtained were compared. Keywords-Classic spar, Morison equation, Diffraction theory, Response Amplitude Operator (RAO).
format Conference or Workshop Item
author Kurian, V.J.
Ng , C.Y.
Liew, M. S.
author_sort Kurian, V.J.
title Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory
title_short Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory
title_full Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory
title_fullStr Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory
title_full_unstemmed Dynamic Responses of Classic Spar Platforms Subjected to Long Crested Waves: Morison Equation vs. Diffraction Theory
title_sort dynamic responses of classic spar platforms subjected to long crested waves: morison equation vs. diffraction theory
publishDate 2012
url http://eprints.utp.edu.my/8343/1/ICSSBE2012-DrKurian.pdf
http://eprints.utp.edu.my/8343/
_version_ 1741196116622311424
score 11.62408

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