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Ship roll restoring moment calculation in beam sea condition

Kianejad, S, Enshaei, H ORCID: 0000-0002-5649-7015, Duffy, J ORCID: 0000-0003-3484-1345 and Ansarifard, N 2020 , 'Ship roll restoring moment calculation in beam sea condition' , Journal of Marine Science and Technology , pp. 1-17 , doi: 10.1007/s00773-020-00713-w.

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Abstract

Accurate calculation of restoring moment, virtual mass moment of inertia and damping moment increases the accuracy of aship’s dynamic stability simulation. The current methods of approximating the roll restoring moment are based on hydrostaticcalculations. These methods fail to consider the dynamic conditions and variation of upward buoyancy and wave locationwith respect to the model. In the current study, experimental and numerical simulations are conducted at beam sea conditionto investigate the behaviour of model. The model is excited by regular waves at diferent heights and frequencies to measurethe motion characteristics and the restoring moment in dynamic conditions. The motion characteristics of the model obtainedfrom the numerical simulation are compared against the experimental measurements, and a good agreement is found. Theresults show that the restoring moments in the dynamic condition have signifcant diferences compared to the static condition. The magnitude of restoring moment in dynamic condition is measured based on the variation of heave motion of themodel and the location of the wave’s crest and trough with respect to the model.

Item Type: Article
Authors/Creators:Kianejad, S and Enshaei, H and Duffy, J and Ansarifard, N
Keywords: restoring moment, buoyancy force, resonance, regular wave
Journal or Publication Title: Journal of Marine Science and Technology
Publisher: Springer Japan
ISSN: 0948-4280
DOI / ID Number: 10.1007/s00773-020-00713-w
Copyright Information:

Copyright 2020 The Japan Society of Naval Architects and Ocean Engineers (JASNAOE)

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