The Theoretical Vertical Motions of a Controlled Hydrofoil in Waves.
BATH IRON WORKS CORP ME*
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The steady-state responses of the vertical motions of an automatically controlled single foil hydrofoil operating in waves with a length-height ratio of 13 are investigated. The effects of orbital motions are incorporated into the analysis in conjunction with straight proportional control, proportional control with anticipation by sensing forward of the control foil, and proportional plus derivative control. The limitations of the analysis are discussed. Phase lag is the critical factor in proportional control. The phase lag can be decreased by sensing forward of the control foil but the optimum location varies with sea conditions. With proportional plus derivative control the phase lag can be decreased and it is primarily dependent upon the parameters of the system. Author
- Marine Engineering
- Fluid Mechanics