| Popis: |
The maneuverability of a ship in waves is strongly influenced by vessel’s inherent course stability and particularly byexisting rudder design. The International Maritime Organization (IMO) has published a series of regulations regarding shipmaneuverability in adverse conditions at low speed in the range of 4-6 knots. These new higher standard of IMO require newapproaches to improve the maneuvering characteristics in waves of the ship comparing with current criteria for calm water. In the paper, to achieve higher rudder efficiency two technical solutions have been studied - traditional, by increase of rudderarea with 20% and innovative – applying the effect of substitution of the trailing edge of the increased rudder design with the wedgetail. The results of aerodynamic tests performed in BSHC-Varna wind tunnel show a high efficiency in both types than original item, independently of the increased drag. The effect of wedge tail are mostly highlight in the created torque of the rudder, almost double compared to the others. This gives preconditions to analyze the ship energy efficiency of the design point of view. |
