Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships
In the design of a vessel’s ultimate strength the extreme hogging condition is of great concern. Due to special properties of container ship structures, such as large bow flare and overhanging stern, wave-induced slamming makes the ship responses more skewed to sagging conditions. In particular in l...
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Online Access: | https://doi.org/10.1115/OMAE2011-49456 https://research.chalmers.se/en/publication/141954 |
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ftchalmersuniv:oai:research.chalmers.se:141954 2023-05-15T17:35:42+02:00 Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships Mao, Wengang Ringsberg, Jonas Li, Zhiyuan Rychlik, Igor 2011 text https://doi.org/10.1115/OMAE2011-49456 https://research.chalmers.se/en/publication/141954 unknown http://dx.doi.org/10.1115/OMAE2011-49456 https://research.chalmers.se/en/publication/141954 Vehicle Engineering Probability Theory and Statistics transformed Gaussian container ship sagging significant wave height full-scale measurement Hogging 2011 ftchalmersuniv https://doi.org/10.1115/OMAE2011-49456 2022-12-11T07:08:13Z In the design of a vessel’s ultimate strength the extreme hogging condition is of great concern. Due to special properties of container ship structures, such as large bow flare and overhanging stern, wave-induced slamming makes the ship responses more skewed to sagging conditions. In particular in large sea states, the ratio between maximum sagging and hogging can be quite high. Hence, the sagging condition might be very crucial with respect to a ship’s ultimate strength. In this study, the extreme response caused by hogging and sagging is derived from upcrossing spectrums of ship responses. The Weibull fitting method and Rice’s formula for the computation of the upcrossing spectrum are discussed using full-scale measurements from a container vessel on the North Atlantic trade. The extreme ship responses are therefore predicted using the long-term upcrossing spectrum. In the case where the ship response can be approximately treated as a series of stationary Gaussian processes, the corresponding upcrossings are computed by the explicit Rice’s formula. For the non-Gaussian ship response, it is shown that the 4-moment Hermite transformation is an efficient approach to compute the corresponding upcrossing spectrums.The parameters in the transformation mainly depend on the wave environments and operation profiles. The relations between these parameters and the wave environments are needed if no measurement is available. However, according to the full-scale measurements, it is not possible to find general formulas to estimate the parameters in terms of wave environments or operation profiles for the practical applications. Other/Unknown Material North Atlantic Chalmers University of Technology: Chalmers research Volume 2: Structures, Safety and Reliability 325 333 |
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Chalmers University of Technology: Chalmers research |
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topic |
Vehicle Engineering Probability Theory and Statistics transformed Gaussian container ship sagging significant wave height full-scale measurement Hogging |
spellingShingle |
Vehicle Engineering Probability Theory and Statistics transformed Gaussian container ship sagging significant wave height full-scale measurement Hogging Mao, Wengang Ringsberg, Jonas Li, Zhiyuan Rychlik, Igor Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships |
topic_facet |
Vehicle Engineering Probability Theory and Statistics transformed Gaussian container ship sagging significant wave height full-scale measurement Hogging |
description |
In the design of a vessel’s ultimate strength the extreme hogging condition is of great concern. Due to special properties of container ship structures, such as large bow flare and overhanging stern, wave-induced slamming makes the ship responses more skewed to sagging conditions. In particular in large sea states, the ratio between maximum sagging and hogging can be quite high. Hence, the sagging condition might be very crucial with respect to a ship’s ultimate strength. In this study, the extreme response caused by hogging and sagging is derived from upcrossing spectrums of ship responses. The Weibull fitting method and Rice’s formula for the computation of the upcrossing spectrum are discussed using full-scale measurements from a container vessel on the North Atlantic trade. The extreme ship responses are therefore predicted using the long-term upcrossing spectrum. In the case where the ship response can be approximately treated as a series of stationary Gaussian processes, the corresponding upcrossings are computed by the explicit Rice’s formula. For the non-Gaussian ship response, it is shown that the 4-moment Hermite transformation is an efficient approach to compute the corresponding upcrossing spectrums.The parameters in the transformation mainly depend on the wave environments and operation profiles. The relations between these parameters and the wave environments are needed if no measurement is available. However, according to the full-scale measurements, it is not possible to find general formulas to estimate the parameters in terms of wave environments or operation profiles for the practical applications. |
author |
Mao, Wengang Ringsberg, Jonas Li, Zhiyuan Rychlik, Igor |
author_facet |
Mao, Wengang Ringsberg, Jonas Li, Zhiyuan Rychlik, Igor |
author_sort |
Mao, Wengang |
title |
Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships |
title_short |
Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships |
title_full |
Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships |
title_fullStr |
Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships |
title_full_unstemmed |
Assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships |
title_sort |
assessment of full-scale measurements with regard to extreme hogging and sagging condition of container ships |
publishDate |
2011 |
url |
https://doi.org/10.1115/OMAE2011-49456 https://research.chalmers.se/en/publication/141954 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://dx.doi.org/10.1115/OMAE2011-49456 https://research.chalmers.se/en/publication/141954 |
op_doi |
https://doi.org/10.1115/OMAE2011-49456 |
container_title |
Volume 2: Structures, Safety and Reliability |
container_start_page |
325 |
op_container_end_page |
333 |
_version_ |
1766134955469963264 |