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

Sheng, Wanan and Tapoglou, Evdokia and Ma, Xiandong and Taylor, C. James and Dorrell, Robert M. and Parsons, Daniel R. and Aggidis, George (2022) Time‐Domain Implementation and Analyses of Multi‐Motion Modes of Floating Structures. Journal of Marine Science and Engineering (JMSE), 10 (5): 662. ISSN 2077-1312

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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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Marine Science and Engineering (JMSE)
?? frequency domain analysistime domain analysishybrid frequency-time domain methodimpulse functionmemory effectprony approximation ??
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17 May 2022 10:25
Last Modified:
15 Feb 2024 15:05