Abstract
ABSTRACTAn improved truncation method for a deepwater mooring system based on the dynamic similarity of the mooring line in the time domain is proposed in this paper. The optimisation algorithm NSGA-II (non-dominated sorting genetic algorithm) is combined with the slender rod model to optimise the mooring line parameters in the static and dynamic analysis of the truncated system. A reliable fitness function is created in the frequency domain by transferring the mooring forces from the time domain with FFT, which makes the dynamic similarity between the truncated and full-depth mooring systems available and effective. An floating production storage and offloading unit (FPSO) mooring system working in 1500 m water depth is truncated to 1050 m and 700 m. The harmonic forced motions as well as the global response and mooring forces of the mooring system under irregular waves are consistent with each other across different water depths, thereby validating the proposed truncation method.
Published Version
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