Wave Drift Forces and Low Frequency Damping on the Exwave FPSO
A method is followed in the present analysis to estimate realistic surge and sway wave drift force coefficients for the Exwave FPSO. Model test data is used to identify the difference frequency wave exciting force coefficients based on a second order signal analysis technique. First, the slowly vary...
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ftsintef:oai:sintef.brage.unit.no:11250/2459802 2023-05-15T14:24:27+02:00 Wave Drift Forces and Low Frequency Damping on the Exwave FPSO Fonseca, Nuno Stansberg, Carl Trygve 2017-06-25 application/pdf http://hdl.handle.net/11250/2459802 https://doi.org/10.1115/OMAE2017-62540 eng eng ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering - Volume 1: Offshore Technology ASME Proceedings %7C Offshore Technology;OMAE2017-62540 urn:isbn:978-0-7918-5763-2 http://hdl.handle.net/11250/2459802 https://doi.org/10.1115/OMAE2017-62540 cristin:1503727 Copyright © 2017 by ASME Damping FPSO Wave drift forces Chapter 2017 ftsintef https://doi.org/10.1115/OMAE2017-62540 2021-08-04T11:59:50Z A method is followed in the present analysis to estimate realistic surge and sway wave drift force coefficients for the Exwave FPSO. Model test data is used to identify the difference frequency wave exciting force coefficients based on a second order signal analysis technique. First, the slowly varying excitation is estimated from the relationship between the incoming wave and the low frequency motion using a linear oscillator. Then, the full QTF of the difference frequency wave exciting forces is defined from the relationship between the incoming waves and the second order force response. The process identifies also the linearized low frequency damping. The paper presents results from a few cases selected from the Exwave JIP test matrix. Empirical mean wave drift coefficients are compared to potential flow predictions. It is shown that the latter underestimate the wave drift forces, especially at the lower frequency range where severe seastates have most of the energy. The sources for the discrepancies are discussed. acceptedVersion Book Part Arctic SINTEF Open (Brage) Volume 1: Offshore Technology |
institution |
Open Polar |
collection |
SINTEF Open (Brage) |
op_collection_id |
ftsintef |
language |
English |
topic |
Damping FPSO Wave drift forces |
spellingShingle |
Damping FPSO Wave drift forces Fonseca, Nuno Stansberg, Carl Trygve Wave Drift Forces and Low Frequency Damping on the Exwave FPSO |
topic_facet |
Damping FPSO Wave drift forces |
description |
A method is followed in the present analysis to estimate realistic surge and sway wave drift force coefficients for the Exwave FPSO. Model test data is used to identify the difference frequency wave exciting force coefficients based on a second order signal analysis technique. First, the slowly varying excitation is estimated from the relationship between the incoming wave and the low frequency motion using a linear oscillator. Then, the full QTF of the difference frequency wave exciting forces is defined from the relationship between the incoming waves and the second order force response. The process identifies also the linearized low frequency damping. The paper presents results from a few cases selected from the Exwave JIP test matrix. Empirical mean wave drift coefficients are compared to potential flow predictions. It is shown that the latter underestimate the wave drift forces, especially at the lower frequency range where severe seastates have most of the energy. The sources for the discrepancies are discussed. acceptedVersion |
format |
Book Part |
author |
Fonseca, Nuno Stansberg, Carl Trygve |
author_facet |
Fonseca, Nuno Stansberg, Carl Trygve |
author_sort |
Fonseca, Nuno |
title |
Wave Drift Forces and Low Frequency Damping on the Exwave FPSO |
title_short |
Wave Drift Forces and Low Frequency Damping on the Exwave FPSO |
title_full |
Wave Drift Forces and Low Frequency Damping on the Exwave FPSO |
title_fullStr |
Wave Drift Forces and Low Frequency Damping on the Exwave FPSO |
title_full_unstemmed |
Wave Drift Forces and Low Frequency Damping on the Exwave FPSO |
title_sort |
wave drift forces and low frequency damping on the exwave fpso |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2459802 https://doi.org/10.1115/OMAE2017-62540 |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering - Volume 1: Offshore Technology ASME Proceedings %7C Offshore Technology;OMAE2017-62540 urn:isbn:978-0-7918-5763-2 http://hdl.handle.net/11250/2459802 https://doi.org/10.1115/OMAE2017-62540 cristin:1503727 |
op_rights |
Copyright © 2017 by ASME |
op_doi |
https://doi.org/10.1115/OMAE2017-62540 |
container_title |
Volume 1: Offshore Technology |
_version_ |
1766296862561665024 |