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Article

Time-Domain Implementation and Analyses of Multi-Motion Modes of Floating Structures

1
Renewable Energy Group, Energy Engineering, Lancaster University, Lancaster LA1 4YW, UK
2
Energy and Environment Institute, University of Hull, Hull HU6 7RX, UK
*
Author to whom correspondence should be addressed.
Current address: European Commission, Joint Research Centre (JRC), 1755 LE Petten, The Netherlands.
Academic Editors: Eugen Rusu, Kostas Belibassakis and George Lavidas
J. Mar. Sci. Eng. 2022, 10(5), 662; https://doi.org/10.3390/jmse10050662
Received: 18 April 2022 / Revised: 9 May 2022 / Accepted: 11 May 2022 / Published: 13 May 2022
(This article belongs to the Topic Marine Renewable Energy)
The study of wave-structure interactions involving nonlinear forces would often make use of the popular hybrid frequency–time domain method. In the hybrid method, the frequency-domain analysis could firstly provide the reliable and accurate dynamic parameters and responses; then these parameters and responses are transformed to the parameters to establishing the basic time-domain equation. Additionally, with the addition of the required linear and nonlinear forces, the time-domain analysis can be used to solve for the practical problems. However, the transformation from the frequency domain to the time domain is not straightforward, and the implementation of the time-domain equation could become increasingly complicated when different modes of motion are coupled. This research presents a systematic introduction on how to implement the time-domain analysis for floating structures, including the parameter transformations from the frequency domain to the time domain, and the methods for calculating and approximating the impulse functions and the fluid-memory effects, with special attention being paid to the coupling terms among the different motion modes, and the correctness of the time-domain-equation implementation. The main purpose of this article is to provide relevant information for those who wish to build their own time-domain analyses with the open-source hydrodynamic analysis packages, although commercial packages are available for time-domain analyses. View Full-Text
Keywords: frequency-domain analysis; time-domain analysis; hybrid frequency–time domain method; impulse function; memory effect; Prony approximation frequency-domain analysis; time-domain analysis; hybrid frequency–time domain method; impulse function; memory effect; Prony approximation
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MDPI and ACS Style

Sheng, W.; Tapoglou, E.; Ma, X.; Taylor, C.J.; Dorrell, R.; Parsons, D.R.; Aggidis, G. Time-Domain Implementation and Analyses of Multi-Motion Modes of Floating Structures. J. Mar. Sci. Eng. 2022, 10, 662. https://doi.org/10.3390/jmse10050662

AMA Style

Sheng W, Tapoglou E, Ma X, Taylor CJ, Dorrell R, Parsons DR, Aggidis G. Time-Domain Implementation and Analyses of Multi-Motion Modes of Floating Structures. Journal of Marine Science and Engineering. 2022; 10(5):662. https://doi.org/10.3390/jmse10050662

Chicago/Turabian Style

Sheng, Wanan, Evdokia Tapoglou, Xiandong Ma, C. James Taylor, Robert Dorrell, Daniel R. Parsons, and George Aggidis. 2022. "Time-Domain Implementation and Analyses of Multi-Motion Modes of Floating Structures" Journal of Marine Science and Engineering 10, no. 5: 662. https://doi.org/10.3390/jmse10050662

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