Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO
The variability of extreme responses of a flexible riser due to wave frequency motions of weather-vaning FPSO is investigated numerically. The objective of this study is to examine such variability in isolation from that caused by the low frequency (slow drift) vessel motions and vessel offsets. Inv...
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ftunivtasecite:oai:ecite.utas.edu.au:120631 2023-05-15T14:26:40+02:00 Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO Armstrong, CJ Drobyshevski, Y Chin, C Penesis, I 2017 https://doi.org/10.1115/OMAE2017-61745 http://ecite.utas.edu.au/120631 en eng American Society of Mechanical Engineers http://dx.doi.org/10.1115/OMAE2017-61745 Armstrong, CJ and Drobyshevski, Y and Chin, C and Penesis, I, Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO, Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering OMAE2017, 25-30 June, 2017, Trondheim, Norway, pp. 1-10. ISBN 9780791857656 (2017) [Refereed Conference Paper] http://ecite.utas.edu.au/120631 Engineering Maritime engineering Ocean engineering Refereed Conference Paper PeerReviewed 2017 ftunivtasecite https://doi.org/10.1115/OMAE2017-61745 2022-11-14T23:17:11Z The variability of extreme responses of a flexible riser due to wave frequency motions of weather-vaning FPSO is investigated numerically. The objective of this study is to examine such variability in isolation from that caused by the low frequency (slow drift) vessel motions and vessel offsets. Investigation of the extreme value distributions of flexible risers provides the statistical foundation for flexible riser Response Based Analysis (RBA) for use in system design; the determination of the statistical properties of extreme flexible riser responses provides a method for the prediction of extreme responses of offshore systems in cyclonic conditions. A case study conducted in OrcaFlex included an FPSOvessel with a Lazy-S configured riser system. Five riser responses were selected in critical locations including tension, heave, and curvature responses. The environmental cases included two cyclonic storms consisting of multiple half-hour intervals. For each interval, time domain simulations included 40 wave realizations in order to provide a dataset for robust fitting of the extreme value distributions in the Gumbel format. Once the short term interval distributions were established, response distributions in a storm were generated by multiplying the short term distributions and the most probable maximum (MPM) response in a storm computed. A comparison of maximum interval, storm and 3-hour MPMs is presented, which indicates to what extent the MPM response in a storm exceeds the corresponding maximum interval response. Differences between the tension and heave responses are compared with those observed in the curvature responses. This study was limited to riser excitation by waves, current and wave frequency motions of a turret moored FPSO and it is expected that further inclusion of low frequency motions would contribute to the response variability. The inclusion of such variability will ultimately enable the storm-based statistical approach to be used for the development of long-term distribution of the riser ... Conference Object Arctic eCite UTAS (University of Tasmania) Turret ENVELOPE(-57.951,-57.951,-62.088,-62.088) Volume 3A: Structures, Safety and Reliability |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
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English |
topic |
Engineering Maritime engineering Ocean engineering |
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Engineering Maritime engineering Ocean engineering Armstrong, CJ Drobyshevski, Y Chin, C Penesis, I Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO |
topic_facet |
Engineering Maritime engineering Ocean engineering |
description |
The variability of extreme responses of a flexible riser due to wave frequency motions of weather-vaning FPSO is investigated numerically. The objective of this study is to examine such variability in isolation from that caused by the low frequency (slow drift) vessel motions and vessel offsets. Investigation of the extreme value distributions of flexible risers provides the statistical foundation for flexible riser Response Based Analysis (RBA) for use in system design; the determination of the statistical properties of extreme flexible riser responses provides a method for the prediction of extreme responses of offshore systems in cyclonic conditions. A case study conducted in OrcaFlex included an FPSOvessel with a Lazy-S configured riser system. Five riser responses were selected in critical locations including tension, heave, and curvature responses. The environmental cases included two cyclonic storms consisting of multiple half-hour intervals. For each interval, time domain simulations included 40 wave realizations in order to provide a dataset for robust fitting of the extreme value distributions in the Gumbel format. Once the short term interval distributions were established, response distributions in a storm were generated by multiplying the short term distributions and the most probable maximum (MPM) response in a storm computed. A comparison of maximum interval, storm and 3-hour MPMs is presented, which indicates to what extent the MPM response in a storm exceeds the corresponding maximum interval response. Differences between the tension and heave responses are compared with those observed in the curvature responses. This study was limited to riser excitation by waves, current and wave frequency motions of a turret moored FPSO and it is expected that further inclusion of low frequency motions would contribute to the response variability. The inclusion of such variability will ultimately enable the storm-based statistical approach to be used for the development of long-term distribution of the riser ... |
format |
Conference Object |
author |
Armstrong, CJ Drobyshevski, Y Chin, C Penesis, I |
author_facet |
Armstrong, CJ Drobyshevski, Y Chin, C Penesis, I |
author_sort |
Armstrong, CJ |
title |
Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO |
title_short |
Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO |
title_full |
Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO |
title_fullStr |
Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO |
title_full_unstemmed |
Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO |
title_sort |
variability of extreme responses due to wave frequency motions of a weather-vaning fpso |
publisher |
American Society of Mechanical Engineers |
publishDate |
2017 |
url |
https://doi.org/10.1115/OMAE2017-61745 http://ecite.utas.edu.au/120631 |
long_lat |
ENVELOPE(-57.951,-57.951,-62.088,-62.088) |
geographic |
Turret |
geographic_facet |
Turret |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://dx.doi.org/10.1115/OMAE2017-61745 Armstrong, CJ and Drobyshevski, Y and Chin, C and Penesis, I, Variability of extreme responses due to wave frequency motions of a weather-vaning FPSO, Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering OMAE2017, 25-30 June, 2017, Trondheim, Norway, pp. 1-10. ISBN 9780791857656 (2017) [Refereed Conference Paper] http://ecite.utas.edu.au/120631 |
op_doi |
https://doi.org/10.1115/OMAE2017-61745 |
container_title |
Volume 3A: Structures, Safety and Reliability |
_version_ |
1766299951126544384 |