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Dynamic positioning - DP systems
A full range of systems
We offer a full range of dynamic positioning systems to keep the vessel within
specified position and heading limits. These systems are designed to minimise fuel consumption and wear and tear on the propulsion equipment. The K-Pos operator station is available in single, dual or triple configurations. More than 1200 dynamic positioning
- DP systems have been supplied to oil and gas related vessels.
Typical applications for dynamic positioning systems
- Drill ships
- Cable-laying vessels
- Crane vessels
- Cruise ships
- Diving support vessels
- Dredging
- FPSO's
- Flotels
- Maritime research vessels
| - Mega yachts
- Mine sweepers
- Pipe laying vessels
- Platform supply vessels
- Rock dumping vessels
- Survey ships
- Supply vessels
- Shuttle tankers
|
The dynamic positioning systems controller
The dynamic positioning systems controller calculates the resulting force to be exerted by the thrusters/propellers in order for the vessel to remain on station. In station-keeping operations, the K-Pos Controller can be working in several of the
following modes, all with special characteristics:
High Precision control: The High Precision dynamic positioning systems control provides high accuracy station-keeping in any weather condition at the expense of power consumption and exposure to wear and tear of machinery and thrusters.
Relaxed control: The Relaxed dynamic positioning systems control uses the thrusters more smoothly, at the expense of station-keeping accuracy. However, this type of control cannot guarantee that the vessel will stay within its
operational area, and is mainly applicable for calm weather conditions.
Green DP® control: The Green DP® dynamic positioning systems control uses very different control technology, called non-linear Model Predictive Control, which is optimised for precise area keeping with minimum
power consumption. The Green DP® control is applicable in all weather conditions. The transition between K-Pos dynamic positioning system controller modes is bumpless.
Stand alone or integrated systems
- Stand-alone dynamic positioning systems interface with other systems, such as power plant and thrusters, via conventional signal cables and serial lines
- Integrated dynamic positioning systems communicate with other KONGSBERG systems such as K-Chief (Marine Automation) and K-Thrust (Thruster Control) via a dual Ethernet LAN
Basic forces and motions
A seagoing vessel is subjected to forces from wind, waves and current as well as from forces generated by the propulsion system.
The vessel's response to these forces, i.e. its changes in position, heading and speed, is measured by the position-reference systems, the gyrocompass and the vertical reference sensors. Reference systems readings are corrected for roll and pitch
using readings from the vertical reference sensors. Wind speed and direction are measured by the wind sensors.
The K-Pos control system calculates the forces that the thrusters must produce in order to control the vessel's motion in three degrees of freedom - surge, sway and yaw - in the horizontal plane.
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