Effect of mooring line layout on the loads of ship-shaped offshore installations

An offshore mooring system stations a ship-shaped installation in place while withstanding incoming loads from the marine environment with short-term and long-term uncertainties. This study aims to develop novel framework for analysing on floating systems, namely line tension, fatigue damage, hull bending moment, as function of layout design variables environmental random variables. The nonlinear influence those is assessed by means advanced techniques using response charts, divergence Sobol's total-effect sensitivity indexes. developed procedure includes probabilistic selection scenarios, station-keeping numerical analyses, metamodel define input loads. example hypothetical production storage offloading (FPSO) unit taut legs Gulf Mexico illustrates procedure. details computations are documented, findings show that top-tension has high index wave-induced moment total whereas damage mostly affected chain diameter. results this research offer useful insights designers propose use surrogate model be used reliability-based systems. • A assess effect lines Nonlinear behaviour described charts. High indexes most influencing parameters. Loads predicted ANN Kriging models. applied FPSO operating region.