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- Offshore wind turbines (5)
- Integrated monitoring system (4)
- Automated operational modal analysis (3)
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- Structural assessment (3)
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- Wind turbines (2)
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- Meerestechnik - Offshore engineering (1)
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- Offshore engineering (1)
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- Stahlbau - Steel construction (1)
- Steel construction (1)
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- Structural monitoring (1)
- Strukturspannungskonzept (1)
- Support structure (1)
- Tower-nacelle system (1)
- Tragfähigkeit (1)
- Traglast (1)
- Ultimate capacity (1)
- Ultimate limit state (1)
- Wahrscheinlichkeit (1)
- Wind energy converter (1)
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- Zuverlässigkeit (1)
A prototype of wind turbines in 5 megawatt dass was built and tested at the first German offshore wind energy test fteld in the North Sea. In order to investigate dynamic behaviors under a complex state of loads, a continuous dynamic monitoring System was implemented by Federal Institute for Material Research and Testing (BAM). It recorded structural responses and environmental/operational variables from November 2007 to October 2009.
This paper presents significant resonance phenomenon due to the interaction in the tower-nacelle System under operational conditions. Modal parameters are automatically estimated by the poly reference Least Square Complex Frequency domain (p-LSCF) method. Campbell plot demonstrates that a three-blade passage frequency and its multiples f3n match with the natural frequencies of the wind turbine System in several modal Orders. The damping estimates decrease and the Vibration amplitude increase significantly. A control System is necessary to minimize the excessive vibrations.
Inspections are an efficient means of enhancing the reliability of redundant structural Systems subjected to fatigue. To investigate the effect of such inspections, we represent the deterioration state of a Daniels System by means of a probabilistic fatigue crack growth model of all elements, which considers stochastic dependence among element fatigue behavior. We include inspection results in the calculation of the System collapse probability through Bayesian updating of the System deterioration state. Based on this approach, we calculate the collapse probability of a deteriorating Daniels System conditional on different inspection strategies in terms of inspection coverage and inspection times. The acceptability of an inspection strategy is verified by comparing the calculated collapse probabilities with maximum acceptable System failure probabilities. This study is a Step towards identifying optimal inspection strategies for redundant structural Systems subjected to fatigue.