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Effect of slam force duration on the vibratory response of a lightweight high-speed wave-piercing catamaran
Citation
McVicar, JJ and Lavroff, J and Davis, MR and Thomas, G, Effect of slam force duration on the vibratory response of a lightweight high-speed wave-piercing catamaran, Journal of Ship Research, 59, (2) pp. 69-84. ISSN 0022-4502 (2015) [Refereed Article]
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DOI: doi:10.5957/JOSR.59.2.140066
Abstract
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 Details
| 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 |
| Author: | McVicar, JJ (Mr Jason McVicar) |
| Author: | Lavroff, J (Dr Jason Lavroff) |
| 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 |
| Downloads: | 0 |
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