Abstract
Global hull girder loads on semi-displacement vessels have not been fully understood yet due to the influence of nonlinear slamming and whipping load effects on the hull girder. Recent studies have shown that slamming and whipping loads could be higher than wave-induced loads under certain conditions. Additionally, current potential flow seakeeping codes do not account for dynamic effects when the vessel is operating in the semi-displacement mode. This paper discusses slamming effects on global hull girder loads using a hydro-elastic model test of a semi-displacement vessel. The test conditions included regular and irregular waves for different model speeds. The data show significant increase in global hull girder loads due to slamming at Froude numbers of 0.45 and 0.7. Additionally, as would be expected, the data show that severe wave conditions increase the slamming intensity. This effect applies particularly for encounter frequencies where slamming is more likely to occur. The data also show that the coupling between heave and pitch motions, as well as wave steepness, are critical parameters with respect to the magnitude of the slamming.
Published Version
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