Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data:
The paper addresses the safety of occupants in free-fall lifeboats launched from turret-moored floating production, storage and offloading (FPSO) vessels. It presents a methodology for assessing operational limits with respect to acceleration-induced loads experienced by the passengers during water...
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American Society of Mechanical Engineers (ASME)
2014
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fttno:oai:tudelft.nl:uuid:873003ca-3940-4fb1-bf0c-abb624c8f744 2023-05-15T14:23:38+02:00 Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data: Fouques, S. Sauder, T. Reinholdtsen, S.A. Dam, E. van Uittenbogaard, J. 2014-01-01 http://resolver.tudelft.nl/uuid:873003ca-3940-4fb1-bf0c-abb624c8f744 en eng American Society of Mechanical Engineers (ASME) uuid:873003ca-3940-4fb1-bf0c-abb624c8f744 520185 http://resolver.tudelft.nl/uuid:873003ca-3940-4fb1-bf0c-abb624c8f744 ISBN:9780791845431 Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, OMAE2014-24074, 4B Computer simulation Floating production storage and offloading Monte Carlo methods Wave height Wind velocity Safety engineering Dynamic positioning systems Injury probabilities Lifeboats Mobility Mechanics Materials and Structures IVS - Integrated Vehicle Safety TS - Technical Sciences article 2014 fttno 2022-04-10T15:53:42Z The paper addresses the safety of occupants in free-fall lifeboats launched from turret-moored floating production, storage and offloading (FPSO) vessels. It presents a methodology for assessing operational limits with respect to acceleration-induced loads experienced by the passengers during water entry. The probability of being injured is estimated by means of numerical simulations for several seat rows and in various sea states described in terms of significant wave height and mean wind velocity. Those results are therefore practical for on-site decisions regarding the use of the free-fall lifeboats. The numerical simulations performed to estimate the 6-degrees of freedom (6-DOF) water entry accelerations in the lifeboats are based on more than 50 years of hindcast metocean data. These consist of sea state parameters provided every third hour and including the significant wave height, the peak period and the direction of both wind-sea and swell as well as the direction and mean velocity of the wind. In a first step, the motion of the FPSO is computed for the whole time period covered by hindcast metocean data, using a state-of-the art numerical model validated against experimental data. The model includes nonlinear excitation forces, a dynamic positioning system with a realistic heading control strategy, mooring line forces as well as turret-hull coupling. The obtained FPSO motion is then used in Monte Carlo simulations of lifeboat launches performed for selected time windows in the original metocean hindcast database corresponding to selected intervals of the significant wave height and mean wind velocity. In addition to the 6-DOF skid motion, the lifeboat launch simulations account for the effects of wind and waves diffracted by the FPSO hull. Finally, a probabilistic model describing the joint-distribution of several injury types and water entry acceleration parameters computed through the launch simulations is used to evaluate the injury probability. The results are presented in term of seating matrices showing critical seat rows, in which the probability of being injured exceeds a pre-defined threshold. Article in Journal/Newspaper Arctic TU Delft: Institutional Repository (Delft University of Technology) Turret ENVELOPE(-57.951,-57.951,-62.088,-62.088) |
institution |
Open Polar |
collection |
TU Delft: Institutional Repository (Delft University of Technology) |
op_collection_id |
fttno |
language |
English |
topic |
Computer simulation Floating production storage and offloading Monte Carlo methods Wave height Wind velocity Safety engineering Dynamic positioning systems Injury probabilities Lifeboats Mobility Mechanics Materials and Structures IVS - Integrated Vehicle Safety TS - Technical Sciences |
spellingShingle |
Computer simulation Floating production storage and offloading Monte Carlo methods Wave height Wind velocity Safety engineering Dynamic positioning systems Injury probabilities Lifeboats Mobility Mechanics Materials and Structures IVS - Integrated Vehicle Safety TS - Technical Sciences Fouques, S. Sauder, T. Reinholdtsen, S.A. Dam, E. van Uittenbogaard, J. Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data: |
topic_facet |
Computer simulation Floating production storage and offloading Monte Carlo methods Wave height Wind velocity Safety engineering Dynamic positioning systems Injury probabilities Lifeboats Mobility Mechanics Materials and Structures IVS - Integrated Vehicle Safety TS - Technical Sciences |
description |
The paper addresses the safety of occupants in free-fall lifeboats launched from turret-moored floating production, storage and offloading (FPSO) vessels. It presents a methodology for assessing operational limits with respect to acceleration-induced loads experienced by the passengers during water entry. The probability of being injured is estimated by means of numerical simulations for several seat rows and in various sea states described in terms of significant wave height and mean wind velocity. Those results are therefore practical for on-site decisions regarding the use of the free-fall lifeboats. The numerical simulations performed to estimate the 6-degrees of freedom (6-DOF) water entry accelerations in the lifeboats are based on more than 50 years of hindcast metocean data. These consist of sea state parameters provided every third hour and including the significant wave height, the peak period and the direction of both wind-sea and swell as well as the direction and mean velocity of the wind. In a first step, the motion of the FPSO is computed for the whole time period covered by hindcast metocean data, using a state-of-the art numerical model validated against experimental data. The model includes nonlinear excitation forces, a dynamic positioning system with a realistic heading control strategy, mooring line forces as well as turret-hull coupling. The obtained FPSO motion is then used in Monte Carlo simulations of lifeboat launches performed for selected time windows in the original metocean hindcast database corresponding to selected intervals of the significant wave height and mean wind velocity. In addition to the 6-DOF skid motion, the lifeboat launch simulations account for the effects of wind and waves diffracted by the FPSO hull. Finally, a probabilistic model describing the joint-distribution of several injury types and water entry acceleration parameters computed through the launch simulations is used to evaluate the injury probability. The results are presented in term of seating matrices showing critical seat rows, in which the probability of being injured exceeds a pre-defined threshold. |
format |
Article in Journal/Newspaper |
author |
Fouques, S. Sauder, T. Reinholdtsen, S.A. Dam, E. van Uittenbogaard, J. |
author_facet |
Fouques, S. Sauder, T. Reinholdtsen, S.A. Dam, E. van Uittenbogaard, J. |
author_sort |
Fouques, S. |
title |
Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data: |
title_short |
Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data: |
title_full |
Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data: |
title_fullStr |
Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data: |
title_full_unstemmed |
Human injury probability during water entry of free-fall lifeboats: Operational criteria based on long-term simulations using hindcast data: |
title_sort |
human injury probability during water entry of free-fall lifeboats: operational criteria based on long-term simulations using hindcast data: |
publisher |
American Society of Mechanical Engineers (ASME) |
publishDate |
2014 |
url |
http://resolver.tudelft.nl/uuid:873003ca-3940-4fb1-bf0c-abb624c8f744 |
long_lat |
ENVELOPE(-57.951,-57.951,-62.088,-62.088) |
geographic |
Turret |
geographic_facet |
Turret |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, OMAE2014-24074, 4B |
op_relation |
uuid:873003ca-3940-4fb1-bf0c-abb624c8f744 520185 http://resolver.tudelft.nl/uuid:873003ca-3940-4fb1-bf0c-abb624c8f744 ISBN:9780791845431 |
_version_ |
1766296136943927296 |