Abstract
Considering that experimental data, usually considered as the reference in test-analysis correlation and model updating purpose, must also be concerned with uncertainty quantification, the experimental variability on modal characteristics of two nominally-identical pumps in industrial environment is observed, via a benchmark between 5 independent teams. Free choice is let to determine the number and the type of sensors, the excitation means, the number of excitation points and the modal identification method. Variabilities relative to the operator and pump specimen are addressed; moreover specific variability relative to the modal identification phase can be quantified using the same experimental test runs.
Due to differences on experimental meshes, from 27 to 138 measurement points, a SEREP expansion on a finite element mesh is first performed, allowing the comparison of experimental modal bases. Global variability observed, based on half paired among identified eigenmodes (within 10 % frequency gap and 50 % MAC criteria), shows a 2 % mean frequency gap and 32 % mean dam** ratio gap. Unit-to-unit variability, essentially attributed to different actual bolted torque levels at component connections and pipe-to-pump connections, and realization of the frame fixation on concrete, shows 10 % mean frequency gap and 28 % mean dam** gap. Specific variability due to modal identification operator, as a component of the global variability, is still significant with a number of identified modes that varies by a factor of 2; the so paired modes show 1 % mean frequency gap and 24 % mean dam** ratio gap.
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Acknowledgements
The support of the FUI (Fonds Unique Interministériel) is gratefully acknowledged. The 13 partners currently involved in 2012–2015 SICODYN project are: AIRBUS Defence & Space, CETIM, EDF R&D, LMT ENS Cachan, Institut FEMTO-ST UMR CNRS 6174, LAMCOS UMR CNRS 5259 INSA Lyon, MSME UMR-CNRS 8208, NECS Numerical Engineering and Consulting Service, PHIMECA Engineering, SAMTECH, SOPEMEA, SULZER Pompes France, VIBRATEC.
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© 2015 The Society for Experimental Mechanics, Inc.
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Audebert, S., Coulon, A., Andrianoely, MA., Muller, S., Foltête, E. (2015). Experimental Variability on Modal Characteristics of an In-Situ Pump. In: Atamturktur, H., Moaveni, B., Papadimitriou, C., Schoenherr, T. (eds) Model Validation and Uncertainty Quantification, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-15224-0_17
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DOI: https://doi.org/10.1007/978-3-319-15224-0_17
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-15223-3
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