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Effect of slam force duration on the vibratory response of a lightweight high-speed wave-piercing catamaran

journal contribution
posted on 2023-05-18, 12:26 authored by Jason McVicarJason McVicar, Jason Ali-LavroffJason Ali-Lavroff, Michael DavisMichael Davis, Giles Thomas
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.

History

Publication title

Journal of Ship Research

Volume

59

Pagination

69-84

ISSN

0022-4502

Department/School

School of Engineering

Publisher

Soc Naval Arch Marine Eng

Place of publication

601 Pavonia Avenue, Jersey City, USA, Nj, 07306

Rights statement

Copyright unknown

Repository Status

  • Restricted

Socio-economic Objectives

Domestic passenger water transport (e.g. ferries)

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