Ship maneuvering system, ship, and ship maneuvering method
AssigneeMitsui E&S Shipbuilding Co., Ltd.
InventorKoh Murata
Life of this patent
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Abstract
A maneuvering system for a ship provided with, in the stern, a port-side propulsion system, and a starboard-side propulsion system. For controlling the system, a forward or backward force of the ship 1 is obtained by the difference between the forward and backward propulsion forces of the propulsion systems and a first turning moment in a turning direction of the ship generated by the propulsion forces is offset by a second turning moment in the turning direction of the ship generated by steering a port-side rudder, whereby the ship moves in a transversal manner toward its starboard side while rotation of the ship is avoided. A high degree of maneuverability is thereby achieved with a relatively simple maneuvering operation.
Claims10
A maneuvering system of a ship having a portside propulsion system including a port-side propulsion device and a port-side rudder and a starboard-side propulsion system including a starboard-side propulsion device and a starboard-side rudder, at its stern,
- the ship maneuvering system comprising a maneuvering control device configured to perform transverse control and pivot turning heading control independently, and including a movement information input unit which is a joy-stick type that only performs transverse control, and a turning information unit which is a dial type that only performs turning heading control;
- wherein said transverse control functions to obtain propulsive force in the longitudinal direction of the ship due to a difference between a backward force of the propulsion system on one broadside and a forward force of the propulsion system on another broadside, and move the ship to the direction of said one broadside, while avoiding turning round of the ship, by cancelling a first turning moment in a turning direction of the ship generated by a backward force of the propulsion system of said one broadside and a forward force of the propulsion system on another broadside, by a second turning moment in a turning direction of the ship generated by steering the rudder of the propulsion system on said another broadside;
- and
- wherein said pivot turning heading control functions to zero out a propulsive force in the longitudinal direction of the ship due to cancelling a backward force of the propulsion system on one broadside by a forward force of the propulsion system on another broadside, and also obtain a turning-round moment of the ship in a turning direction by adding a second turning moment in a turning direction of the ship generated by steering the rudder of the propulsion system on said another broadside to a first turning moment in the turning direction of the ship generated by the backward force of the propulsion system of said one broadside and a forward force of the propulsion system on said another broadside, so as to cause a bow of the ship to turn heading on the spot to the direction of said one broadside.
A maneuvering method of a ship having two propulsion systems of a port-side propulsion system including a port-side propulsion device and a port-side rudder and a starboard-side propulsion system including a starboard-side propulsion device and a starboard-side rudder, at its stern, the ship maneuvering system comprising a maneuvering control device configured to perform transverse control and pivot turning heading control independently, and including a movement information input unit which is a joy-stick type that only performs transverse control, and a turning information unit which is a dial type that only performs turning head control,
- the method performing at least one of:
- obtaining a propulsive force in the longitudinal direction of the ship due to a difference between a backward force of the propulsion system on one broadside and a forward force of the propulsion system on another broadside, and moving the ship to the direction of said one broadside, while avoiding turning round of the ship, by cancelling a first turning moment in a turning direction of the ship generated by a backward force of the propulsion system of said one broadside and a forward force of the propulsion system on another broadside, by a second turning moment in a turning direction of the ship generated by steering the rudder of the propulsion system on said another broadside;
- and
- zeroing out a propulsive force in the longitudinal direction of the ship due to cancelling a backward force of the propulsion system on one broadside by a forward force of the propulsion system on another broadside, and also obtaining a turning-round moment of the ship in a turning direction by adding a second turning moment in a turning direction of the ship generated by steering the rudder of the propulsion system on said another broadside to a first turning moment in the turning direction of the ship generated by the backward force of the propulsion system of said one broadside and a forward force of the propulsion system on said another broadside, so as to cause bow of the ship to turn on the spot to the direction of said one broadside.
Dependencies are inferred from the claim text.