Investigation of Bending Moments within the Midship Half Length of a Mariner Model in Extreme Waves

摘要

One objective of this project was to obtain experimental model data to describe the lengthwise vertical wave bending moment distribution within the midship half length of a normally loaded Mariner type cargo ship in regular head and following waves having wave height/wave length ratios between 0.05 and 0.11; a second loading conditions was also examined. A second objective was to determine whether the moments tend to reach an upper limit as wave height increases. A 1/96 scale model was cut to form six segments which were jointed by an aluminum beam. The beam was strain gaged to measure bending moments at the hull cuts at stations 5, 7-1/2, 10, 12-1/2 and 15. Within practical operational limits for the Mariner type ship, maximum wave bending moments in high regular waves occur in the region from amidships to .125L aft of amidships. Hogging and sagging moment at any section were generally proportional to wave height up to a wave height/wave length ratio of 0.11, the steepest wave that could be generated. (Author)