On the model uncertainty of wave induced platform motions and mooring loads of a semisubmersible based wind turbine. (15th January 2018)

• Record Type: Journal Article
• Authors: Uzunoglu, E.; Guedes Soares, C.
• Is Part Of: Ocean engineering. Volume 148(2018)
• Page Start: 277
• Page End: 285
• Publication Date: 2018-01-15
• Subjects: Model uncertainty -- Wave induced responses -- Wind induced responses -- Floating wind turbines -- Mooring responses; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2017.11.001
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: This work quantifies the model uncertainty in the wave-induced motion calculations of the codes in the Offshore Code Comparison Study Phase II, Semisubmersible Platform Based Floating Wind Turbine. Root mean square values are used to represent the spectral responses. This form is compared using their coefficient of variance values. A white noise spectrum without wind is chosen in head waves. This type of loading excites surge, heave, and pitch modes. The mathematical models that represent these motions are examined in three sections. The initial part considers how participants with the same primary approach (i.e., the Morrison Equation, a hybrid method combining the potential flow theory with the Morrison Equation, and Potential flow with added quadratic damping) diverge from each other. The second section evaluates the differences between models, disregarding alterations such as the instantaneous position. The third set compares all methods in detail, considering the additions and alterations to the primary approaches. In addition to the motions, the model uncertainty in the estimation of mooring line loads is discussed. Highlights: The model uncertainty in the wave-induced motion calculations of the codes in the Offshore Code Comparison Study is quantified. Root mean square values are used to represent the spectral responses of the motions, and the mooring line loads. The initial part considers how participants with the same primary diverge from each other. The second section evaluates the differences between models, disregarding alterations such as the instantaneous position. The third set compares all methods in detail, considering the additions and alterations to the primary approaches.