Experimental Study of an Automatic Pitch Control System on a Swatch Model
STEVENS INST OF TECH HOBOKEN NJ DAVIDSON LAB
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The report presents the results of a series of tests which was carried out in order to develop a small physical model of an automatic pitch control system for a SWATH ship, and to study the interaction of the control surface with the twin hulls in calm water and regular waves. A four phase test program was followed to assess the control system fixed trim, free to heave tests of the unappended hull, tests of isolated canards, fixed trim tests in calm water and in waves with instrumented canards, and free to trim and heave tests in regular waves with and without automatic control. Drag, pitching moment, canard lift and drag, etc., were measured and analyzed. The maximum lift on the canards in waves was found to be significantly larger than that measured in static tests. Results are presented in graphic and tabular form. Tests in regular waves with pitch control showed that a 50 reduction in pitch amplitude is possible in following seas. SWATH, Automatic control, Unsteady lift, Control surfaces, Seakeeping.
- Marine Engineering