A comprehensive motion and load model for caisson spar systems



Executive Summary

Sparsim is a comprehensive analysis tool used for design, evaluation, maintenance and failure analysis of moored, deep-draft caisson-style offshore development and production systems. These systems comprise a massive spar-shaped vessel, usually positioned with a more-or-less conventional taut catenary mooring system. The program provides detailed mooring line and vessel performance data under specifiable water depth and environmental conditions, including characteristic (r.m.s.) and peak system 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. These systems are characterized by extreme nonlinearities at every phase of performance analysis; Sparsim accommodates these nonlinearities at all levels, including system statics, quasi-statics and dynamics. Execution is carried out in the frequency domain, resulting in short run times and unambiguous predictions of statistical response values.

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