Affiliation:
1. Vrije Universiteit Brussel
Abstract
This paper will show the first results of a long term monitoring campaign on an offshore wind turbine in the Belgian North Sea. It will focus on the vibration levels and resonant frequencies of the fundamental modes of the support structure. These parameters will be crucial to minimize O&M costs and to extend the lifetime of offshore wind turbine structures. For monopile foundations for example, scouring and reduction in foundation integrity over time are especially problematic because they reduce the fundamental structural resonance of the support structure, aligning that resonance frequency more closely to the lower frequencies. Since both the broadband wave energy and the rotating frequency of the turbine are contained in this low frequency band, the lower natural frequency can create resonant behavior increasing fatigue damage. Continuous monitoring of the effect of scour on the dynamics of the wind turbine will help to optimize the maintenance activities on the scour protection system. To allow a proper continuous monitoring during operation, reliable state-of-the-art operational modal analysis techniques should be used and these are presented in this paper. The methods are also automated, so that no human-interaction is required and the system can track the natural frequencies and damping ratios in a reliable manner.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference15 articles.
1. Zaaijer M.B., Tripod support structure - pre-design and natural frequency assessment for the 6 MW DOWEC, Doc. no. 63, TUD, Delft, 14 May (2002).
2. Van Der Tempel J., Design of Support Structures for Offshore Wind Turbines, PhD T.U. Delft, (2006).
3. Chauhan S., Tcherniak D., Basurko J., et all. Operational Modal Analysis of Operating Wind Turbines: Application to Measured Data, Volume 5, Proceedings of the Society for Experimental Mechanics Series, 8, (2011).
4. Davis D., Pollack M., Petersen B., Evaluate the Effect of Turbine Period of Vibration Requirements on. Structural Design Parameters, Technical report of findings, (2010).
5. Carne T.G. , James G.H., The inception of OMA in the development of modal testing for wind turbines, Mechanical Systems and Signal Processing, 24, 1213-1226, (2010).
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献