NDLI: Extreme Structural Dynamic Response of a Spar Type Wind Turbine

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Karimirad, Madjid Moan, Torgeir
Copyright Year	2010
Abstract	Proper performance of structures requires among other things that its failure probability is sufficiently small. This would imply design for survival in extreme conditions. The failure of a system can occur when the ultimate strength is exceeded (Ultimate Limit State) or fatigue limit (Fatigue Limit State) is passed. The focus in this paper is on the determination of extreme responses for ULS design checks. The present paper deals with coupled wave and wind induced motion and structural response in harsh condition up to 14.4 (m) significant wave height and 49 (m/sec) 10-min average wind speed (at top of tower, 90 m) for a parked floating wind turbine. In survival condition the wind induced resonant responses (mainly platform pitch resonance) are dominant. Due to platform resonant motion responses, the structural responses are close to Gaussian. The dynamic structural responses show that the process is wide banded. The critical structural responses are determined by coupled aero-hydro-elastic time domain simulation. Based on different simulations (20 1-hour, 20 2-hours, 20 3-hours and 20 5-hours) the mean up-crossing rate has been found in order to predict the extreme structural responses. The most probable maximum of the bending moment and the bending moment having up-crossing rate of 10−4 are found to be close in the present research. The minimum total simulation time in order to get accurate results is highly correlated to the needed up-crossing rate. The 1-hour and 2-hours original values cannot provide any information for 10−4 up-crossing rate. Comparison of different simulation periods shows that the 20 1-hour simulations can be used in order to investigate the 3-hours extreme bending moment if the proper extrapolation of up-crossing rate used.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	303
Ending Page	312
Page Count	10
File Format	PDF
ISBN	9780791849118
DOI	10.1115/OMAE2010-20044
e-ISBN	9780791838730
Volume Number	29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 3
Conference Proceedings	ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2010-06-06
Publisher Place	Shanghai, China
Access Restriction	Subscribed
Subject Keyword	Offshore wind turbine Stochastic dynamic response Extreme structural response Spar platform Dynamic response Structural dynamics Wind Structural response analysis Probability Wind velocity Fatigue limit Waves Spar platforms Tensile strength Design Floating wind turbines Simulation Offshore wind turbines Resonance Wind turbines Failure Significant wave heights
Content Type	Text
Resource Type	Article

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