State-Space Realization of the Wave-Radiation Force within FAST: Preprint

• Main Authors: Duarte, T., Sarmento, A., Alves, M., Jonkman, J.
• Other Authors: Wind and Hydropower Technologies Program (U.S.)
• Format: Article in Journal/Newspaper
• Language: English
• Published: National Renewable Energy Laboratory (U.S.) 2013
• Subjects: Linear Potential-Flow Theory; 17 Wind Energy Wave Radiation; Nrel; State-Space Model; Time-Convolution; Wind Energy; Wave Radiation; Arctic
• Online Access: https://digital.library.unt.edu/ark:/67531/metadc836419/

Several methods have been proposed in the literature to find a state-space model for the wave-radiation forces. In this paper, four methods were compared, two in the frequency domain and two in the time domain. The frequency-response function and the impulse response of the resulting state-space models were compared against the ones derived by the numerical code WAMIT. The implementation of the state-space module within the FAST offshore wind turbine computer-aided engineering (CAE) tool was verified, comparing the results against the previously implemented numerical convolution method. The results agreed between the two methods, with a significant reduction in required computational time when using the state-space module.