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

Sheng, Wanan; Tapoglou, Evdokia; Ma, Xiandong; Taylor, C. James; Dorrell, Robert; Parsons, Daniel R.; Aggidis, George

Abstract

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.

Citation

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

• Journal Article Type: Article
• Acceptance Date: May 11, 2022
• Online Publication Date: May 13, 2022
• Publication Date: May 1, 2022
• Deposit Date: Feb 19, 2024
• Publicly Available Date: Feb 20, 2024
• Journal: Journal of Marine Science and Engineering
• Electronic ISSN: 2077-1312
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 10
• Issue: 5
• Article Number: 662
• DOI: https://doi.org/10.3390/jmse10050662
• Keywords: Frequency-domain analysis; Time-domain analysis; Hybrid frequency–time domain method; Impulse function; Memory effect; Prony approximation
• Public URL: https://hull-repository.worktribe.com/output/4029588