Abstract
Prior to any structural system realization during the design phase, the structural dynamic should be characterized. Dynamic characterization provides the designers with local and global dynamic information which can be used to optimize the structures. To characterize the dynamic of too large and complex structures generally Dynamic Substructuring (DS) techniques are used. Experimental DS is one of these techniques and is recently more in use. Many researchers put effort in developing and evolving new concepts. The substructuring focus group at Society for Experimental Mechanics (SEM) uses a small-scale wind turbine, Ampair 600, in a combined effort to validate, classify and advance these techniques. In this paper the substructuring results, obtained with the LM FBS formulation applied to the wind turbines rotor are given. The Interface Deformation Mode (IDM) method is adopted and applied to overcome the lack of Rotational Degrees of Freedom (RDoF) and to minimize the measurement noise. To include the joint stiffness and damping a Substitute (Fixture) is used and two methods are proposed to model flexible and rigid Cyclic Symmetric Structures (CSS). The results obtained in this first substructure analysis of the rotor show that good results can be found in the lower frequency range.
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Notes
- 1.
Due to attached mass the structure deforms locally near the interface in the lower structure modes, which is not possible in the usual free-interface configuration.
- 2.
In decoupling it is also possible to impose compatibility constraints on the internal DoF’s. It would improve the decoupling when the substitute has also internal DoF’s and will lead to slightly different formulations.
- 3.
SDtools is used as the modal analysis toolbox.
- 4.
In [12] all extracted modes are illustrated.
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Acknowledgements
We would like to thank Sandia National Laboratories and especially Howard W. Arris for helping us podding the hub. Also We thank Ampair Energy Ltd. for providing us the brackets and the blade drawing.
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Rahimi, S., de Klerk, D., Rixen, D.J. (2014). The Ampair 600 Wind Turbine Benchmark: Results From the Frequency Based Substructuring Applied to the Rotor Assembly. In: Mayes, R., Rixen, D., Allen, M. (eds) Topics in Experimental Dynamic Substructuring, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6540-9_15
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