engleski

Frequency Independent Model Error of Closed-Form Expressions for Calculating Wave-Induced Ship Motions in Vertical Plane

Closed-form expressions (CFE) enable rapid computation of amplitudes of transfer functions of ship motion and global loads, based only on main ship particulars. As preliminary comparisons indicated reasonable agreement of CFE with experimental results, CFE have been used in many conceptual studies where fast computation of ship motions and loads is crucial. Since there is still an open question of the model error introduced by using CFE instead of more complex seakeeping tools, the aim of the present study is to quantify frequency independent model error (FIME) of CFE for ship motion in vertical plane. FIME is determined by comparing transfer functions calculated by CFE with model-scale experiments. Measured transfer functions of heave and pitch for eleven ships of different types and sizes are taken from the literature, where several speeds and heading angles are available for some of them. Multivariate linear regression analysis is performed to show dependence of FIME on the main parameters of the analysis. Outcomes of this study could enhance practical applicability of CFE.

Closed-form expressions ; Frequency Independent model error ; Seakeeping

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