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Control and Simulation of a Thruster-Assisted Moored Offshore Vessel in Sea-ice

Gjessing, Ivar Aleksander
Master thesis
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URI
http://hdl.handle.net/11250/2350625
Date
2015
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  • Institutt for marin teknikk [2352]
Abstract
The exploration of the northern seas is constantly raising new and interesting

research topics in order to adapt our technology to handle this extraordinary

harsh climate. Darkness, remoteness, cold and harsh weather, and not at least,

drifting ice and icebergs, are making the conventional equipment used further

south useless. The ice loads are largely different from open water sea loads, while

remoteness and the harsh environment makes safety an even more important issue.

The Arctic conditions are difficult to recreate due to the inpredictability and

large variations in ice features, and going up there with all the needed equipment

is particularly expensive. It is possible to create realistic ice features in a model

basin, but it takes time and effort compared to open water.

This is why a numerical computer simulator is an attractive option. This

thesis is investigating the properties of the Numerical Ice Tank (NIT) simulator

developed at NTNU in order to implement a high fidelity turret mooring model

into it. A finite element based mooring model is implemented and tested in the

NIT. Controller strategies for adaption into ice infested areas are discussed and

tested in the simulator.

A theoretical background on dynamic positioning (DP), position mooring

(PM), controller design, arctic conditions and mathematical modelling is pro-

vided.
Publisher
NTNU

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