A comprehensive motion and load model for catenary-restored turret-moored vessels.



Executive Summary

SPMsim is a comprehensive analysis tool used for design, evaluation, maintenance and failure analysis of catenary-based single-point mooring (SPM) systems, including vessel-fixed turret systems. It provides detailed mooring system 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. Catenary-based mooring systems are characterized by extreme nonlinearities at every phase of performance analysis; SPMsim 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). The program is especially useful for deep-water applications which are difficult to study thoroughly using conventional model-scale tests. Direct comparison of SPMsim'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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