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Otunola, A. (2003) *Comparison of Åsgard B platform's field measurement and time domain numerical simulations*. Göteborg : Chalmers University of Technology

** BibTeX **

@mastersthesis{

Otunola2003,

author={Otunola, Abiodun Adebayo},

title={Comparison of Åsgard B platform's field measurement and time domain numerical simulations},

abstract={Moored floating platforms are used for drilling and exploration activates and they require
high degree of precise positioning to perform optimally with associated facilities. They are
subjected to combined environmental loads of waves, wind and current while in service,
which affects their stability in addition to positioning.
Dynamic analysis of a floating moored platform is therefore carried out to determine its
response to environmental loads. This analysis could be done in the time domain or the
frequency domain. A floating platform is associated with lots of non-linearities, which are
linearised in the frequency domain simulations. In the time domain analysis however, the
non-linearities are modelled with the intention of making more accurate analysis but this
makes the computation complex and require a great deal of computer time.
GVA Consultants have developed software, CASH (Coupled Analysis Software for
Hydrodynamics) for time domain analysis of a moored floating platform. The program
performs dynamic analysis in a combined state (low-frequency and wave –frequency) in the
six degrees of freedom. The program had earlier been verified against other software and a
good agreement has also been obtained between CASH and model test.
The objective of the thesis work therefore is to compare CASH simulation with measured
field data
STATOIL has measured the environmental loads, motion responses and line tensions of
Åsgard B semi-submersible platform in the North Sea and data are to be used for CASH
simulation and results compared afterwards .
The model test performed on Åsgard B was used to calibrate wind, current and wave drift
force coefficients which form part of the input to CASH for the field environmental load
analysis.
Three different sea states (in increasing order) were selected from the measured field data
to perform CASH analysis.
CASH numerical simulations agreed with the model test results and measured field data in
terms of mean offsets and mean line tensions. The disparity in standard deviation is
suggested for further investigation.},

publisher={Institutionen för Vatten Miljö Transport, Chalmers tekniska högskola},

place={Göteborg},

year={2003},

note={66},

}

** RefWorks **

RT Generic

SR Print

ID 165825

A1 Otunola, Abiodun Adebayo

T1 Comparison of Åsgard B platform's field measurement and time domain numerical simulations

YR 2003

AB Moored floating platforms are used for drilling and exploration activates and they require
high degree of precise positioning to perform optimally with associated facilities. They are
subjected to combined environmental loads of waves, wind and current while in service,
which affects their stability in addition to positioning.
Dynamic analysis of a floating moored platform is therefore carried out to determine its
response to environmental loads. This analysis could be done in the time domain or the
frequency domain. A floating platform is associated with lots of non-linearities, which are
linearised in the frequency domain simulations. In the time domain analysis however, the
non-linearities are modelled with the intention of making more accurate analysis but this
makes the computation complex and require a great deal of computer time.
GVA Consultants have developed software, CASH (Coupled Analysis Software for
Hydrodynamics) for time domain analysis of a moored floating platform. The program
performs dynamic analysis in a combined state (low-frequency and wave –frequency) in the
six degrees of freedom. The program had earlier been verified against other software and a
good agreement has also been obtained between CASH and model test.
The objective of the thesis work therefore is to compare CASH simulation with measured
field data
STATOIL has measured the environmental loads, motion responses and line tensions of
Åsgard B semi-submersible platform in the North Sea and data are to be used for CASH
simulation and results compared afterwards .
The model test performed on Åsgard B was used to calibrate wind, current and wave drift
force coefficients which form part of the input to CASH for the field environmental load
analysis.
Three different sea states (in increasing order) were selected from the measured field data
to perform CASH analysis.
CASH numerical simulations agreed with the model test results and measured field data in
terms of mean offsets and mean line tensions. The disparity in standard deviation is
suggested for further investigation.

PB Institutionen för Vatten Miljö Transport, Chalmers tekniska högskola,

LA eng

OL 30