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Advanced Meta-Modelling Techniques and Sensitivity Analysis for Rotordynamics in an Uncertain Context

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Model Validation and Uncertainty Quantification, Volume 3

Abstract

It is essential to predict accurately the critical speeds and associated vibration amplitudes of rotating machineries to ensure a correct design to limit noise nuisance and fatigue failure. However, numerous uncertainties are present, due to environmental variations or manufacturing tolerances, e.g. and must be taken into consideration in the design stage to limit their impact on the system dynamics. These uncertainties are usually modelled with a probability law, and the dynamic response becomes stochastic. On the other side, during the design stage, a few key parameters, often called design parameters, are identified and tuned to ensure a robust conception of the rotor w.r.t. the uncertain model parameters. In this context, one must tackle a high-dimension parametric problem but numerous parameters of different nature. The efficiency of an advanced meta-modelling technique that couple polynomial chaos expansion and kriging is demonstrated here. The kriging efficiency is improved by introducing physical properties of the rotor. A finite element model of a rotor subjected to nine uncertain parameters is studied. The hybrid surrogate model gives a direct access to the Sobol indices, exploited to conduct an extensive sensitivity analysis.

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Acknowledgement

E. Denimal acknowledges the financial support of Rennes Metropole. J-J. Sinou acknowledges the support of the Institut Universitaire de France.

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Denimal, E., Sinou, JJ. (2023). Advanced Meta-Modelling Techniques and Sensitivity Analysis for Rotordynamics in an Uncertain Context. In: Mao, Z. (eds) Model Validation and Uncertainty Quantification, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-031-04090-0_6

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  • DOI: https://doi.org/10.1007/978-3-031-04090-0_6

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-031-04089-4

  • Online ISBN: 978-3-031-04090-0

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