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Inertial Sensors for Risk-Based Redundancy in Dynamic Positioning

Bryne, Torleiv Håland; Rogne, Robert Harald; Fossen, Thor I.; Johansen, Tor Arne
Chapter, Conference object
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omae_dp_sensors.pdf (179.4Kb)
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http://hdl.handle.net/11250/2485654
Utgivelsesdato
2017
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Originalversjon
Proceedings of ASME 2017 36th International Conference on Ocean, Offshore & Arctic Engineering, OMAE 2017.   10.1115/OMAE2017-61290
Sammendrag
In this paper we present an alternative configuration of sensors, position and heading reference systems for dynamically positioned (DP) vessels. The approach uses a sensor structure based on low-cost inertial measurements units (IMUs), satisfying fault tolerance against single-point failures that is at the essence of the IMO guidelines for both DP class 2 and 3 vessels. Recent results have shown that dual-redundant position and heading ref- erence systems are sufficient to prevent loss of position within some well-defined time horizons by exploiting sensor fusion of the reference systems and triple-redundant MEMS-based IMUs. These IMUs also function as Vertical Reference Units (VRUs), since vessel motions is obtained using the same IMU configura- tion and sensor fusion framework. In this proposition, the ac- celeration measurements provided by the IMUs make wind and other force sensors unnecessary, except possibly for an advisory role. The proposed framework has the potential to significantly reduce the cost of dynamic positioning systems without compro- mising safety.
Utgiver
American Society of Mechanical Engineers (ASME)

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