Abstract
This study treats with the effect of rudder speed to the Batch Adaptive Roll Reducible Autopilot System (BARRAS) which was developed by the authors. The onboard experiments are carried out using a newly developed oil pressure steering gear called Direct Drive Volume Control System (DDVC) which has high performances on rudder speed, fuel assumption and so on. The effects of the rudder speed are examined by changing the weight of performance index and analyzed from view points of power spectra, noise contribution and impulse response functions.
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