Response of Classic Spar by Morison Equation and Diffraction Theory
ABSTRACT This paper presents the numerical hydrodynamic analysis and comparison of the motion responses of offshore spar platforms in regular sea waves using Morison equation and diffraction method. The classic spar was modeled as a rigid body with three degrees of freedom restrained by mooring...
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | http://scholars.utp.edu.my/id/eprint/2271/ http://scholars.utp.edu.my/id/eprint/2271/1/Offshore_Asia_2010_-_59_Kurian_V_John.pdf |
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| author | Kurian, V.J. Ng , C.Y. Montasir,, O.A.A Muhammed , M.A.W. |
| author_facet | Kurian, V.J. Ng , C.Y. Montasir,, O.A.A Muhammed , M.A.W. |
| author_sort | Kurian, V.J. |
| building | UTP Institutional Repository |
| collection | Online Access |
| description | ABSTRACT
This paper presents the numerical hydrodynamic analysis and comparison of the motion
responses of offshore spar platforms in regular sea waves using Morison equation and
diffraction method. The classic spar was modeled as a rigid body with three degrees of
freedom restrained by mooring lines. Linear Airy wave theory and Morison 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 Beta time domain dynamic analysis method. The results were obtained as transfer functions in surge, heave and pitch. In the second case, the transfer functions were obtained using software based on linear diffraction method. The calculation of wave forces using Morison equation was found to give significant errors, especially in the low frequency range.
KEYWORDS
Spar platforms, Hydrodynamic analysis, Degree of Freedom (DOF), Morison modified
equations, Diffraction Method, Transfer Function. |
| first_indexed | 2025-11-13T07:26:59Z |
| format | Conference or Workshop Item |
| id | oai:scholars.utp.edu.my:2271 |
| institution | Universiti Teknologi Petronas |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-13T07:26:59Z |
| publishDate | 2010 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | oai:scholars.utp.edu.my:22712017-03-20T01:59:55Z http://scholars.utp.edu.my/id/eprint/2271/ Response of Classic Spar by Morison Equation and Diffraction Theory Kurian, V.J. Ng , C.Y. Montasir,, O.A.A Muhammed , M.A.W. TC Hydraulic engineering. Ocean engineering TA Engineering (General). Civil engineering (General) ABSTRACT This paper presents the numerical hydrodynamic analysis and comparison of the motion responses of offshore spar platforms in regular sea waves using Morison equation and diffraction method. The classic spar was modeled as a rigid body with three degrees of freedom restrained by mooring lines. Linear Airy wave theory and Morison 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 Beta time domain dynamic analysis method. The results were obtained as transfer functions in surge, heave and pitch. In the second case, the transfer functions were obtained using software based on linear diffraction method. The calculation of wave forces using Morison equation was found to give significant errors, especially in the low frequency range. KEYWORDS Spar platforms, Hydrodynamic analysis, Degree of Freedom (DOF), Morison modified equations, Diffraction Method, Transfer Function. 2010-03 Conference or Workshop Item PeerReviewed application/pdf en http://scholars.utp.edu.my/id/eprint/2271/1/Offshore_Asia_2010_-_59_Kurian_V_John.pdf Kurian, V.J. and Ng , C.Y. and Montasir,, O.A.A and Muhammed , M.A.W. (2010) Response of Classic Spar by Morison Equation and Diffraction Theory. In: Offshore Asia 2010, 16-18 March 2010, Kuala Lumpur. |
| spellingShingle | TC Hydraulic engineering. Ocean engineering TA Engineering (General). Civil engineering (General) Kurian, V.J. Ng , C.Y. Montasir,, O.A.A Muhammed , M.A.W. Response of Classic Spar by Morison Equation and Diffraction Theory |
| title | Response of Classic Spar by Morison
Equation and Diffraction Theory |
| title_full | Response of Classic Spar by Morison
Equation and Diffraction Theory |
| title_fullStr | Response of Classic Spar by Morison
Equation and Diffraction Theory |
| title_full_unstemmed | Response of Classic Spar by Morison
Equation and Diffraction Theory |
| title_short | Response of Classic Spar by Morison
Equation and Diffraction Theory |
| title_sort | response of classic spar by morison
equation and diffraction theory |
| topic | TC Hydraulic engineering. Ocean engineering TA Engineering (General). Civil engineering (General) |
| url | http://scholars.utp.edu.my/id/eprint/2271/ http://scholars.utp.edu.my/id/eprint/2271/1/Offshore_Asia_2010_-_59_Kurian_V_John.pdf |