Method for actively damping a ship's motion as well as such an active roll stabilisation system
First Claim
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1. A method for actively damping a ship'"'"'s motion while the ship is sailing by driving at least one first rotatable damping element that extends from the ship'"'"'s hull, below the water line, on a side of the ship, comprising the steps of:
- i) sensing the ship'"'"'s motion and sailing speed,ii) generating and delivering control signals on the basis of step i),iii) rotatably driving the stabilization elements on the basis of step ii),iv) determining, on the basis of step i), the current frictional resistance experienced by the stabilization elements at the sensed motion and sailing speed of the ship,v) setting the stabilization element at an angle relative to a longitudinal axis of the ship on the basis of the determined current frictional resistance and a desired minimum frictional resistance.
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Abstract
The invention relates to a method and device for actively damping a ship'"'"'s motion while the ship is sailing including driving at least one first rotatable damping element that extends from the ship'"'"'s hull, below the water line, on a side of the ship.
According to the invention, the method is characterized by the steps of:
- i) sensing the ship'"'"'s motion and sailing speed,
- ii) generating and delivering control signals on the basis of step i),
- iii) rotatably driving the stabilization elements on the basis of step ii),
- iv) determining, on the basis of step i), the current frictional resistance experienced by the stabilization elements at the sensed motion and sailing speed of the ship,
- v) setting the stabilization element at an angle relative to a longitudinal axis of the ship on the basis of the determined current frictional resistance and a desired minimum frictional resistance.
9 Citations
9 Claims
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1. A method for actively damping a ship'"'"'s motion while the ship is sailing by driving at least one first rotatable damping element that extends from the ship'"'"'s hull, below the water line, on a side of the ship, comprising the steps of:
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i) sensing the ship'"'"'s motion and sailing speed, ii) generating and delivering control signals on the basis of step i), iii) rotatably driving the stabilization elements on the basis of step ii), iv) determining, on the basis of step i), the current frictional resistance experienced by the stabilization elements at the sensed motion and sailing speed of the ship, v) setting the stabilization element at an angle relative to a longitudinal axis of the ship on the basis of the determined current frictional resistance and a desired minimum frictional resistance. - View Dependent Claims (2, 3)
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4. A system for actively damping a ship'"'"'s motion, comprising at least
one first rotatable damping element extending from the ship'"'"'s hull, below the water line, on a side of the ship, sensor means for sensing the ship'"'"'s motion and delivering control signals on the basis thereof, driving means for rotatably driving the stabilization element on the basis of the control signals being delivered for the purpose of damping the ship'"'"'s motion being sensed, wherein the sensor means furthermore are an tinged in sensing the ship'"'"'s speed as well as the current frictional resistance experienced by the stabilizing elements and the system furthermore comprising moving means which position the stabilization element at an angle relative to a longitudinal axis of the ship on the basis of the delivered control signals and the speed of the ship and the determined current frictional resistance so as to realize a minimal resistance while the ship is sailing.
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6. A system actively damping a ships motion, comprising at least
one first rotatable damping element extending from the ship'"'"'s hull, below the water line, on a side of the ship, sensor means for sensing the ship'"'"'s motion and delivering control signals on the basis thereof, driving means for rotatably driving the stabilization element on the basis of the control signals being delivered for the purpose of damping the ship'"'"'s motion being sensed, as well as moving means which position the stabilization element at an angle relative to a longitudinal axis of the ship on the basis of the delivered control signals and the speed of the ship and the determined current frictional resistance so as to realize a minimal resistance while the ship is sailing, characterized in that the sensor means are designed to determine the current sailing speed and comparing said current sailing speed with a reference sailing speed and delivering control signals to the driving means and the moving means, respectively, on the basis of this comparison, such that if the current sailing speed is lower than the reference sailing speed, the driving means will drive the stabilization element at a rotational speed of more than 0 rpm, and that if the current sailing speed is higher than the reference sailing speed, the driving means will drive the stabilization element at a rotational speed equal to 0 rpm and the moving means will pivot the non-rotating stabilization element to and fro.
Specification