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An initial estimation of DP requirements for a non-moored operational FPSO

An initial estimation of DP requirements for a non-moored operational FPSO
An initial estimation of DP requirements for a non-moored operational FPSO
This paper presents a direct estimate of the dynamic horizontal plan positioning forces and moment to keep a proposed Floating, Production and Storage Offloading system (FPSO) with open moonpool on station, without moorings, through novel application of standard frequency domain motion response analysis. Reasons for selecting frequency domain over time domain formulations presented is justified. Quality of hydrodynamic reactive quantities, required in motion response formulation, from a third party 3D boundary element based formulation is discussed in terms of expected cross term symmetry, with warning of how blind software application can be erroneous. Combining motions from standard unconstrained motion equations and global thruster loading requirements from a novel response formulation, the time-averaged DP thruster cluster power is estimated. Hence individual thruster power can be assigned recognizing the redundancy requirements of a Class 3 DP system
19-26
CRC Press
Hearn, Grant
c1b2912b-fe5c-432c-aaa4-39c5eff75178
Bratu, G.C.
524cbad5-5629-48c8-a11f-b0dfbc0f9ff9
Soares, Guedes C.
Shenoi, Ajit
Hearn, Grant
c1b2912b-fe5c-432c-aaa4-39c5eff75178
Bratu, G.C.
524cbad5-5629-48c8-a11f-b0dfbc0f9ff9
Soares, Guedes C.
Shenoi, Ajit

Hearn, Grant and Bratu, G.C. (2015) An initial estimation of DP requirements for a non-moored operational FPSO. Soares, Guedes C. and Shenoi, Ajit (eds.) In Analysis and Design of Marine Structures. CRC Press. pp. 19-26 . (doi:10.1201/b18179-5).

Record type: Conference or Workshop Item (Paper)

Abstract

This paper presents a direct estimate of the dynamic horizontal plan positioning forces and moment to keep a proposed Floating, Production and Storage Offloading system (FPSO) with open moonpool on station, without moorings, through novel application of standard frequency domain motion response analysis. Reasons for selecting frequency domain over time domain formulations presented is justified. Quality of hydrodynamic reactive quantities, required in motion response formulation, from a third party 3D boundary element based formulation is discussed in terms of expected cross term symmetry, with warning of how blind software application can be erroneous. Combining motions from standard unconstrained motion equations and global thruster loading requirements from a novel response formulation, the time-averaged DP thruster cluster power is estimated. Hence individual thruster power can be assigned recognizing the redundancy requirements of a Class 3 DP system

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Published date: 25 March 2015
Venue - Dates: Proceedings of the 5th International Conference on Marine Structures (MARSTRUCT 2015), Southampton, United Kingdom, 2015-03-25 - 2015-03-27
Organisations: Fluid Structure Interactions Group

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Local EPrints ID: 399294
URI: http://eprints.soton.ac.uk/id/eprint/399294
PURE UUID: 5496fa0e-c57a-415c-aa9c-22eae5e61942

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Date deposited: 15 Aug 2016 08:33
Last modified: 08 Jan 2022 18:35

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Contributors

Author: Grant Hearn
Author: G.C. Bratu
Editor: Guedes C. Soares
Editor: Ajit Shenoi

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