A motion and load estimator for catenary-based spread mooring systems.



Executive Summary

Moorsim is a comprehensive software tool used for design, evaluation, maintenance and line failure analysis of catenary-type spread mooring systems. It provides detailed mooring line and vessel performance data under specifiable water depth and environmental conditions, including characteristic (r.m.s.) and peak mooring line loads in the forecast maximum storm. A wide range of environmental conditions is accommodated, including extensive built-in wave spectral types, azimuthal spreading of wave directions, an optional independent background swell, and steady or fluctuating wind and/or current. Spread mooring systems are characterized by extreme nonlinearities at every phase of performance analysis; Moorsim accommodates these nonlinearities at all levels, including system statics, quasi-statics (low-frequency oscillations with typical periods of one to ten minutes) and dynamics (wave-frequency oscillations with typical periods of 4 to 30 seconds). Moorsim is suitable for on-board use in an advisory capacity during mooring setup or storm preparation. The program is especially useful for deep-water applications which are difficult to study thoroughly using conventional model-scale tests. Direct comparison of Moorsim's nonlinear dynamic load calculation with the quasi-static catenary calculation often used as an approximation is provided as an output option. Execution is carried out in the frequency domain, resulting in short run times and unambiguous predictions of statistical response values.

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