Write your message
Volume 17, Issue 34 (12-2021)                   marine-engineering 2021, 17(34): 85-98 | Back to browse issues page

XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Sayyadi M, Zareei M R. Numerical analysis of moorings of floating wind turbine and statistical distribution. marine-engineering. 2021; 17 (34) :85-98
URL: http://marine-eng.ir/article-1-915-en.html
1- Marine engineering faculty, Chabahar Maritime University
Abstract:   (361 Views)
The mooring design of floating structures is one of the important parts in the design process of offshore structures. To design and evaluate the performance of mooring lines, criteria such as ultimate strength and fatigue have been defined. In real conditions, mooring forces are random variables, so to check the strength, the statistical distribution of mooring forces under the influence of environmental condition must be calculated at first. In this article, a statistical study of the mooring force of a semi-submersible offshore wind turbine, which is stabled by three catenary-chain mooring lines, has been considered. Hydrodynamic analysis of the structure was performed by ANSYS-AQWA software and the environmental characteristics of the area were extracted from the DNVGL standard for the Mediterranean Sea. During the life of the structure, due to corrosion, the diameter of the mooring chain decreases. Therefore, in this research, the condition of the mooring lines from the perspective of tensile forces has been investigated by considering the corrosion at a constant annual rate. During the life of the structure, due to corrosion and as a result the reduction of the axial stiffness, the tension of the mooring lines will be reduced. This amount of reduction for the critical mooring line in 10-year intervals of its 30-year lifetime is 5.4, 13.1 and 21.3 percent, respectively.
Full-Text [PDF 1282 kb]   (158 Downloads)    
Type of Study: Research Paper | Subject: Offshore Hydrodynamic
Received: 2021/06/27 | Accepted: 2021/10/26

References
1. Global Wind Energy Council (GWEC), (2019), GWEC Repoer, https://gwec.net/global-wind-report-2019.
2. Ma, K., Shu, H., Smedley, P., (2013), A Historical Review on Integrity Issues of Permanent Mooring Systems. In: Offshore Technology Conference, OTC 24025. . [DOI:10.4043/24025-MS]
3. Hordvik, T., (2011), Design analysis and optimisation of mooring system for floating wind turbines. M.Sc. thesis, NTNU.
4. Hsu, W., Thiagarajan, K.P., Manuel, L., (2017), Extreme mooring tensions due to snap loads on a floating offshore wind turbine system. Journal of Marine Structres, Vol. 55, p. 182-199. [DOI:10.1016/j.marstruc.2017.05.005]
5. Benassai, G., Campanile, A., Piscopo. V., (2014), Ultimate and accidental limit state design for mooring systems of floating offshore wind turbines. Journal of Ocean Engineering, Vol. 92, p. 64-74. [DOI:10.1016/j.oceaneng.2014.09.036]
6. Pham, H.D., (2019), Modeling and Service Life Monitoring of Mooring Lines of Floating Wind Turbines, Phd thesis, École centrale de Nantes. [DOI:10.1016/j.oceaneng.2019.106603]
7. Pham, H.D., Schoefs, F., Cartraud, P., (2019), Methodology for modeling and service life monitoring of mooring lines of floating wind turbines, Journal of Ocean Engineering, Vol. 193, 106603. [DOI:10.1016/j.oceaneng.2019.106603]
8. Zhang, L., Shi, W., Karimirad, M., (2020), Second-order hydrodynamic effects on the response of three semisubmersible floating offshore wind turbines, Journal of Ocean Engineering, Vol. 207, 107371. [DOI:10.1016/j.oceaneng.2020.107371]
9. Ghafari, H. R., Dardel, M., (2018), Parametric study of catenary mooring system on the dynamic response of the semi-submersible platform, (2018), Journal of Ocean Engineering, Vol. 153, p. 319-332. [DOI:10.1016/j.oceaneng.2018.01.093]
10. Ghafari, H. R., Ketabdari, J., Ghassemi, H., (2019), Numerical study on the hydrodynamic interaction between two floating platforms in Caspian Sea environmental conditions, Jornal of Ocean Engineering, Vol. 188, 106237. [DOI:10.1016/j.oceaneng.2019.106273]
11. Ferri, G., Marino, E., Borri, C., (2020), Optimal Dimensions of a Semisubmersible Floating Platform for a 10 MW Wind Turbine. Energies, Journal of Energies, Vol. 13(12), 3092. [DOI:10.3390/en13123092]
12. Coulling, A.J., Goupee, A.J., Robertson, A.N., (2013), Validation of a FAST semi-submersible floating wind turbine numerical model with DeepCwind test data, Journal of Renewable and Sustainable Energy, Vol. 5, 23116. [DOI:10.1063/1.4796197]
13. Lin, Y-H., Yang, C-H., (2020), Hydrodynamic Simulation of the Semi-Submersible Wind Float by Investigating Mooring Systems in Irregular Waves, Jornal of Applied science, Vol. 10, 4267. [DOI:10.3390/app10124267]
14. Zhou, Y., Xiao, Q., Liu, Y., (2019), Numerical modelling of dynamic responses of a floating offshore wind turbine subject to focused waves, Journal of Energies, Vol. 12, 3482. [DOI:10.3390/en12183482]
15. DNVGL, (2018), Position mooring, DNVGL-OS-E301.
16. DNV, (2013), Design of Offshore Wind Turbine Structures, Offshore Standard, DNV-OS-J101.
17. DNV, (2010), Envirinmental conditions and environmental loads, Recommended practice, DNV-RP-C205.
18. KR, (2017), Rules for the Classification of Steel Ships, Part 4 Hull Equipment. Korean register.
19. Zhao, Y., Dong, S., (2021), Long-term extreme response analysis for semi-submersible platform mooring systems. Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment. Vol.235(2), 463-479. [DOI:10.1177/1475090220976515]
20. Kim, D.H., Lee, S.G., (2015), Reliability analysis of offshore wind turbine support structures under extreme ocean environmental loads,Journal of Renewable Energy, Vol. 79, 161-166, [DOI:10.1016/j.renene.2014.11.052]

Send email to the article author


Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Creative Commons License
International Journal of Maritime Technology is licensed under a

Creative Commons Attribution-NonCommercial 4.0 International License.