Simulating the dynamics of the CX-100 wind turbine blade: Model selection using a robustness criterion

Kendra L. Van Buren, Sez Atamturktur, François M. Hemez

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Several plausible modeling strategies are available to develop finite element (FE) models of ever-increasingly complex phenomena. Expert judgment is typically used to choose which strategy to employ, while the "best" modeling approach remains unknown. This paper proposes a decision analysis methodology that offers a systematic and rigorous methodology for comparing plausible modeling strategies. The proposed methodology departs from the conventional approach that considers only test-analysis correlation to select the model that provides the highest degree of fidelity-to-data. The novelty of the methodology lies in an exploration of the trade-offs between robustness to uncertainty and fidelity-to-data. Exploring robustness to model imprecision and inexactness, in addition to fidelity-to-data, lends credibility to the simulation by guaranteeing that its predictions can be trusted even if some of the modeling assumptions and input parameters are incorrect. To demonstrate this approach, an experimental configuration is analyzed in which large masses are used to load the CX-100 wind turbine blade in bending during vibration testing. Two plausible simulations are developed with differing strategies to implement these large masses using (i) a combination of point-mass and spring elements or (ii) solid elements. In this paper, the authors study the ability of the two FE models to predict the experimentally obtained natural frequencies, and the robustness of these competing models to uncertainties in the input parameters. Considering robustness for model selection provides the extent to which prediction accuracy deteriorates as the lack-of-knowledge increases. Therefore, the preferable modeling strategy is the one that offers the best compromise between fidelity-to-data and robustness to uncertainty. To predict the bending vibration of the CX-100 wind turbine blade, it is observed that the modeling strategy with solid elements is far superior to the other one in its ability to provide a compromise between fidelity-to-data and robustness to the modeling assumptions.

Original languageEnglish (US)
Title of host publicationTopics in Model Validation and Uncertainty Quantification - Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
Pages99-112
Number of pages14
DOIs
StatePublished - 2013
Event31st IMAC, A Conference on Structural Dynamics, 2013 - Garden Grove, CA, United States
Duration: Feb 11 2013Feb 14 2013

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Volume5
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Other

Other31st IMAC, A Conference on Structural Dynamics, 2013
CountryUnited States
CityGarden Grove, CA
Period2/11/132/14/13

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

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