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[PhD Thesis] Control and Response of Pod-Driven Ships
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Dr Michael Woodward
School of Marine Science and Technology
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The fundamental objective of this thesis is to make qualified assessment of the validity of the IMO manoeuvring criteria ‘Resolution MSC.137(76)’, when applied to pod-driven ships. The performance limits given by the criteria provide an adequate benchmark to compare all ships, regardless of propulsion type however the application of specific helm angle is less well defined – an azimuthing pod drive can be turned to any helm angle with no specific definition for the angle of maximum force. To address this problem, new methods for modelling the hydrodynamic reaction for both the ship hull and pod drive are identified. Then, a dedicated numerical simulation study is conducted exploring systematic variation of applied helm angles and comparison of time- and frequency-domain response. The study reaches the definitive conclusion that, the criteria provide equivalent information about the manoeuvring response of pod-driven ships as for conventionally propelled ships; and can thus be applied directly.
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