27 Utilization of Experimental Data in Elastic Multibody Simulation: Case Study on the Ampair 600 Turbine Blade 277 Mode 1 Mode 3 Mode 4 Mode 5 Mode 9 Mode 12 Fig. 27.8 Mode shapes 1, 3, 4, 5, 9 and 12 of the multibody model properties, and the positioning of the reference frame in the center of mass. For the modal model, experimental modal analysis is carried out on the blade utilizing a total of 27 measurement locations. The inertia properties are estimated based on a CAD model of the blade. A linear analysis of the derived multibody model exhibits an exact representation of the measured mode shapes, natural frequencies, and damping ratios. Future work will address the following topics: • Although it was shown in [9] by the authors of this contribution that experimental synthesis results in a full set of system matrices to account for the strong nonlinear dynamics of the body caused by gross rigid body motion together with elastic deformations, transient analysis of the blades multibody model will be conducted to validate the approach further. • So far, the investigations concentrated on the unconstrained multibody model. Future work will focus on the coupling of the blade model to other bodies in a multibody system. As pointed out in [8], the correct representation of rotation in the set of elastic coordinates has to be accounted for, which is not a result of conventional modal analysis. Acknowledgments This research is part of the DynAWind2 project funded by the German Federal Ministry for Economic Affairs and Energy under grant number 0325228E/F/G. References 1. Klerk, D.D., Rixen, D.J., Voormeeren, S.N.: General framework for dynamic substructuring: History, review and classification of techniques. AIAA Journal 46(5), 1169–1181 (2008). https://doi.org/10.2514/1.33274 2. Rahimi, S., de Klerk, D., Rixen, D.J.: 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, vol. 2, Conference Proceedings of the Society for Experimental Mechanics Series, vol. 329, pp. 179–192. Springer, New York (2014). https://doi.org/10.1007/978-1-4614-65409_15 3. Macknelly, D., Nurbhai, M., Monk, N.: Imac XXXI: Additional modal testing of turbine blades and the application of transmission simulator substructuring methodology for coupling. In: Mayes, R., Rixen, D., Allen, M. (eds.) Topics in Experimental Dynamic Substructuring, vol. 2, Conference Proceedings of the Society for Experimental Mechanics Series, vol. 329, pp. 145–155. Springer, New York (2014). https://doi.org/ 10.1007/978-1-4614-6540-9_12 4. Dynamic substructuring wiki – dynamic substructuring focus group wiki (15 Mar 2018). http://substructure.engr.wisc.edu/substwiki/index. php/Dynamic_Substructuring_Wiki 5. Fehr, J., Eberhard, P.: Error-controlled model reduction in flexible multibody dynamics. J. Comput. Nonlinear Dyn. 5(3), 031005 (2010). https://doi.org/10.1115/1.4001372
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