T Roberts

TL;DR: In this paper, the authors report on work to further understand the vibratory damping of large high-speed catamarans during delivery voyages and regular service operations and find that the total predicted damping due to hydrodynamic and material damping was only a small proportion of the measured total damping.

Abstract: In order to optimise the structural design of lightweight high speed vessels knowledge is required of the effect of sea loads on their structure. Wet deck slam events are of particular importance for high speed catamarans. This paper reports on the use of dynamic finite element analysis to investigate the transient response of a large high speed catamaran to an extreme asymmetric wet deck slam. Such an extreme slam occurred whilst extensive full scale hull stress, motion and wave measurements were being conducted on a 96m catamaran. Dynamic finite element analysis, including the fluid-structure interaction, has been utilised to develop an extreme slam dynamic load case which may be utilised in the design process. Results from this analysis are compared with the stress levels obtained through applying the Det Norske Veritas (DNV) longitudinal bending moment (sagging) rule load case.

TL;DR: In this article, the authors investigated the influence of slamming and whipping on the fatigue life of a large high-speed catamaran, and found that a reduction in slamming may prolong the fatigue of a vessel markedly.

TL;DR: In this article, extensive full-scale trials were conducted by the U.S. Navy on an INCAT Tasmania built vessel in the North Sea and North Atlantic region, and collected data has been used to characterise the ship's motions and seakeeping performance with respect to wave environment, vessel speed and ride control system.