When the surface of a ship meets the water surface at an acute angle with a high relative velocity, significant short-duration forces can act on the hull plating. Such an event is referred to as a slam. Slam loads imparted on ships are generally considered to be of an impulsive nature. As such, slam loads induce vibration in the global hull structure that has implications for both hull girder bending strength and fatigue life of a vessel. A modal method is often used for structural analysis whereby higher order modes are neglected to reduce computational effort. The effect of the slam load temporal distribution on the whipping response and vertical bending moment are investigated here by using a continuous beam model with application to a 112 m INCAT wave-piercing catamaran and correlation to full-scale and model-scale experimental data. Experimental studies have indicated that the vertical bending moment is dominated by the fundamental longitudinal bending mode of the structure. However, it is shown here that although the fundamental mode is dominant in the global structural response, the higher order modes play a significant role in the early stages of the response and may not be readily identifiable if measurements are not taken sufficiently close to the slam location. A relationship between the slam duration and the relative modal response magnitudes is found, which is useful in determining the appropriate truncation of a modal solution.

Item Type:	Refereed Article
Keywords:	slam duration, high-speed catamaran, vibratory response
Research Division:	Engineering
Research Group:	Mechanical Engineering
Research Field:	Mechanical Engineering not elsewhere classified
Objective Division:	Transport
Objective Group:	Water Transport
Objective Field:	Passenger Water Transport
UTAS Author:	McVicar, JJ (Mr Jason McVicar)
UTAS Author:	Lavroff, J (Dr Jason Lavroff)
UTAS Author:	Davis, MR (Professor Michael Davis)
ID Code:	102481
Year Published:	2015
Web of Science® Times Cited:	4
Deposited By:	Engineering
Deposited On:	2015-08-24
Last Modified:	2017-11-03
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