Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line Forces

Quasi-Static analysis of moored vessels is vastly used for engineering designs, as a substitute to the numerical simulation of dynamic mooring analysis. Yet, the level of validity of the results of quasi-static analysis is a matter of discussion. In the present study, the validation of the assumptio...

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Main Author: Ahmad Shanehsazzadeh
Format: Article
Language:English
Published: Iranian Association of Naval Architecture and Marine Engineering 2013-06-01
Series:International Journal of Maritime Technology
Subjects:
Online Access:http://ijmt.ir/article-1-217-en.html
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spelling doaj-61a1f22bd1384201b4500cc41d022b472021-02-14T08:50:39ZengIranian Association of Naval Architecture and Marine EngineeringInternational Journal of Maritime Technology2345-60002476-53332013-06-0116772Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line ForcesAhmad Shanehsazzadeh0 University of Isfahan Quasi-Static analysis of moored vessels is vastly used for engineering designs, as a substitute to the numerical simulation of dynamic mooring analysis. Yet, the level of validity of the results of quasi-static analysis is a matter of discussion. In the present study, the validation of the assumptions behind the quasi-static analysis of mooring vessels is examined with application of a dynamic model for a number of vessel sizes and mooring configurations. The results show that in the moderate wave condition (wave height less than 1.2m), the main assumption of not applicability of wave forces in prediction of line forces is acceptable the differences being less than 5 percent. However, distribution of forces between spring and breasting lines is not coincided with the anticipation of response of the system. The parametric study shows that the critical condition for line tensions is not necessarily corresponding to the exact coincidence of directions of wind, current and wave forces. Also, the forces exerted on fenders in some cases are maxima in direction, different from the perpendicular to the vessel. This means that the mooring line arrangement considerably dictates the distribution of the tension in mooring lines and reaction in fenders. Hence, the accuracy of the quasi-static analysis highly depends on the mooring lines configuration.http://ijmt.ir/article-1-217-en.htmlquasi-static mooring analysisdynamic mooring analysisvesselmooring line
collection DOAJ
language English
format Article
sources DOAJ
author Ahmad Shanehsazzadeh
spellingShingle Ahmad Shanehsazzadeh
Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line Forces
International Journal of Maritime Technology
quasi-static mooring analysis
dynamic mooring analysis
vessel
mooring line
author_facet Ahmad Shanehsazzadeh
author_sort Ahmad Shanehsazzadeh
title Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line Forces
title_short Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line Forces
title_full Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line Forces
title_fullStr Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line Forces
title_full_unstemmed Evaluating the Validity of Quasi-Static Analysis for Prediction of Vessel Mooring Line Forces
title_sort evaluating the validity of quasi-static analysis for prediction of vessel mooring line forces
publisher Iranian Association of Naval Architecture and Marine Engineering
series International Journal of Maritime Technology
issn 2345-6000
2476-5333
publishDate 2013-06-01
description Quasi-Static analysis of moored vessels is vastly used for engineering designs, as a substitute to the numerical simulation of dynamic mooring analysis. Yet, the level of validity of the results of quasi-static analysis is a matter of discussion. In the present study, the validation of the assumptions behind the quasi-static analysis of mooring vessels is examined with application of a dynamic model for a number of vessel sizes and mooring configurations. The results show that in the moderate wave condition (wave height less than 1.2m), the main assumption of not applicability of wave forces in prediction of line forces is acceptable the differences being less than 5 percent. However, distribution of forces between spring and breasting lines is not coincided with the anticipation of response of the system. The parametric study shows that the critical condition for line tensions is not necessarily corresponding to the exact coincidence of directions of wind, current and wave forces. Also, the forces exerted on fenders in some cases are maxima in direction, different from the perpendicular to the vessel. This means that the mooring line arrangement considerably dictates the distribution of the tension in mooring lines and reaction in fenders. Hence, the accuracy of the quasi-static analysis highly depends on the mooring lines configuration.
topic quasi-static mooring analysis
dynamic mooring analysis
vessel
mooring line
url http://ijmt.ir/article-1-217-en.html
work_keys_str_mv AT ahmadshanehsazzadeh evaluatingthevalidityofquasistaticanalysisforpredictionofvesselmooringlineforces
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