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Assessment of raking damage from decelerations measured during a grounding incident

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Author: Kempen, E.C. van · Vredeveldt, A.W. · Hoogeland, M.G.
Type:article
Date:2018
Publisher: Royal Institution of Naval Architects
Source:RINA, Royal Institution of Naval Architects - Damaged Ship IV, Papers, RINA, Royal Institution of Naval Architects - 4th International Conference on Damaged Ship 2018, 16 May 2018 through 17 May 2018, 1-7
Identifier: 866889
ISBN: 9.78191E+12
Keywords: Grounding damage · Prediction from measured accelerations · Raking damage · Ship grounding · Ship survival · Three degrees of freedom external dynamics model · Maritime & Offshore · Energy

Abstract

A three degree of freedom external dynamics calculation model for ship grounding has been made, which is used to predict the extent of bottom raking damage and the grounding force with associated decelerations of the ship in terms of surge, sway and yaw. When the ship decelerates, caused by a grounding event, these motions can be logged through continuous ship motion measurements. From these deceleration time traces it is possible to calculate the bottom damage path through a double integration with respect to time. Moreover, with these decelerations, the location of the raking damage along the ship's bottom can be calculated as well. A straight forward method is proposed, which is validated against data on ship grounding external dynamics from earlier research and data from large-scale grounding experiments, both carried out in the nineties of the previous century. © 2018 The Royal Institution of Naval Architects.