This paper presents time domain simulation methodologies for a Dynamically Positioned (DP) vessel with a case study of a DP vessel's performance using a time domain approach. The study focuses on the differences of the DP capability assessment using quasi-static equilibrium and dynamic time domain approaches, and the application of the time domain method to assessment of the vessel's drift-off. Additionally, the effect of environmental conditions including wind, wave and current loads on the drift-off speed was also studied and will be discussed in this paper. The understanding of drift-off behavior will benefit the onboard decision-making in response to a drift-off event.

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