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Ship roll restoring moment calculation in beam sea condition


Kianejad, S and Enshaei, H and Duffy, J and Ansarifard, N, Ship roll restoring moment calculation in beam sea condition, Journal of Marine Science and Technology, 25 pp. 1266-1282. ISSN 0948-4280 (2020) [Refereed Article]

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Copyright Statement

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

DOI: doi:10.1007/s00773-020-00713-w


Accurate calculation of restoring moment, virtual mass moment of inertia and damping moment increases the accuracy of a ship’s dynamic stability simulation. The current methods of approximating the roll restoring moment are based on hydrostatic calculations. These methods fail to consider the dynamic conditions and variation of upward buoyancy and wave location with respect to the model. In the current study, experimental and numerical simulations are conducted at beam sea condition to investigate the behaviour of model. The model is excited by regular waves at diferent heights and frequencies to measure the motion characteristics and the restoring moment in dynamic conditions. The motion characteristics of the model obtained from the numerical simulation are compared against the experimental measurements, and a good agreement is found. The results 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 the model and the location of the wave’s crest and trough with respect to the model.

Item Details

Item Type:Refereed Article
Keywords:restoring moment, buoyancy force, resonance, regular wave
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Naval architecture
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Kianejad, S (Mr Seyedsadreddin Kianejadtejenaki)
UTAS Author:Enshaei, H (Dr Hossein Enshaei)
UTAS Author:Duffy, J (Dr Jonathan Duffy)
UTAS Author:Ansarifard, N (Ms Nazanin Ansarifard)
ID Code:137922
Year Published:2020
Web of Science® Times Cited:1
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2020-03-13
Last Modified:2021-06-07

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