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Vertical Plane and Roll Motion Stabilization of SWATH Ships
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT
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A method has been developed to rapidly assess the effects of active fins on the vertical motions platforming and contouring modes andor the roll motion of a SWATH ship in waves. The method combines Linear Quadratic Theory LQT of optimal control for obtaining the fin control law with the SWATH seakeeping Evaluation Program SSEP. The nonlinearities produced by the fin angle and fin rate saturation are approximated by placing limiting values on their corresponding values in a seaway. This permits frequency domain computations of the stabilized motions which is more consistent with LQT and more cost effective than those computed in the time domain. A description of the procedure and sample results are provided.
APPROVED FOR PUBLIC RELEASE