The Effect of Longitudinal Center of Flotation and Longitudinal Metacentric Height on Responses of Low Speed Swath Configurations.
Final rept. 31 Oct 81-30 Sep 82,
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT
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The effect of longitudinal metacentric height GML and longitudinal center of flotation LCF on responses in regular waves and irregular seas is investigated analytically for a series of 2550 tonne SWATH configurations. All configurations have two struts per hull and lower hulls which include conic frustrums. Heave, pitch, relative bow motion, absolute bow motion, and absolute stern motion are studied at 0, 3, 10, and 15 knots in head and following seas. The predictions show that increasing GML generally results in decreased responses to irregular seas. Locating the LCF aft of the longitudinal center of buoyancy LCB in head seas reduces responses for all motions studied for low speeds and in following seas reduces relative and absolute vertical motions at the bow for all speeds.
- Marine Engineering
- Fluid Mechanics