Feasibility Study on Thruster-Assisted Turret-Moored FPSO by Coupled Dynamic Analysis

Large motion responses of offshore platforms in harsh environment in deep water are of great concern for the operation and design of the platforms. Thruster-assisted position mooring systems can be applied to avoid excessive motions of the platforms. Fully coupled dynamic analysis of a thruster-assisted turret-moored Floating, Production, Storage, and Offloading unit was performed. Kalman filtering, PD control, and thrust allocation were linked with the hull/mooring/riser time-domain coupled dynamic analysis program called WINPOST-FPSO. The numerical example illustrates general performance of a thruster-assisted turret-moored FPSO and shows that the mooring/riser tensions are reduced.