A method has been developed to rapidly assess the effects of active fins on the vertical motions (platforming and contouring modes) and/or 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.
Vertical Plane and Roll Motion Stabilization of SWATH Ships
1986
31 pages
Report
Keine Angabe
Englisch
Marine Engineering , Hydrodynamic control surfaces , Attitude control systems , Fins , Angles , Frequency , Limitations , Linearity , Motion , Optimization , Quadratic equations , Rates , Roll , Saturation , Seakeeping , Stabilization , Test and evaluation , Theory , Time domain , Value , Vertical orientation , Stabilization systems , Activation , Ship motion , Mathematical prediction , Computer aided design , SWATH Ships , LQTC(Linear Quadratic Theory) , Fin Stabilized Ships , Optimal Control , Active Fin Stabilizers
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