Dynamics of geometrically-nonlinear beam structures, part 2: Experimental analysis

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Authors

  • D. Anastasio
  • J. P. Noël
  • G. Kerschen
  • S. Marchesiello
  • J. Häfele
  • C. G. Gebhardt
  • R. Rolfes
  • J. Dietrich

Research Organisations

External Research Organisations

  • Politecnico di Torino (POLITO)
  • University of Liege
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Details

Original languageEnglish
Title of host publicationNonlinear structures and systems, volume 1
Subtitle of host publicationProceedings of the 37th IMAC, a conference and exposition on structural dynamics 2019
EditorsGaetan Kerschen, M.R.W. Brake, Ludovic Renson
Place of PublicationCham
PublisherSpringer Verlag
Pages217-220
Number of pages4
ISBN (electronic)9783030123918
ISBN (print)9783030123901
Publication statusPublished - 29 Jun 2019
Event37th IMAC, A Conference and Exposition on Structural Dynamics, 2019 - Orlando, United States
Duration: 28 Jan 201931 Jan 2019

Publication series

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

Abstract

System identification is a key tool to gather information about dynamical structures. In the last decades, important steps have been made to perform this task in the presence of localized nonlinearities. However, the continual interest in improving structural performance has created the need of designing light and flexible elements in several engineering fields. These elements are usually characterized by moderate and large deformations, exhibiting distributed nonlinearities. System identification of structures with distributed nonlinear features remains particularly challenging, especially when dealing with experimental data. This work proposes a method to perform such a task, relying on a convenient basis reduction of the measured signals. The identification is then performed using the nonlinear subspace identification method (NSI) in the reduced domain together with a closed-form nonlinear description. This methodology is validated on an experimental structure, consisting of a very thin steel beam that is clamped at both ends. Excited with a multisine, the beam undergoes large amplitude oscillations. A final objective of the identification is to exploit its response through the correct identification of the parameters that define the nonlinearity. Results show a high level of accuracy, which validates the effectiveness of the methodology and paves the way toward the identification of more complex real-life structures exhibiting large deformations.

Keywords

    Geometrical nonlinearity, Large deformation, Nonlinear beam, Nonlinear system identification, Subspace identification

ASJC Scopus subject areas

Cite this

Dynamics of geometrically-nonlinear beam structures, part 2: Experimental analysis. / Anastasio, D.; Noël, J. P.; Kerschen, G. et al.
Nonlinear structures and systems, volume 1: Proceedings of the 37th IMAC, a conference and exposition on structural dynamics 2019. ed. / Gaetan Kerschen; M.R.W. Brake; Ludovic Renson. Cham: Springer Verlag, 2019. p. 217-220 (Conference Proceedings of the Society for Experimental Mechanics Series).

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Anastasio, D, Noël, JP, Kerschen, G, Marchesiello, S, Häfele, J, Gebhardt, CG, Rolfes, R & Dietrich, J 2019, Dynamics of geometrically-nonlinear beam structures, part 2: Experimental analysis. in G Kerschen, MRW Brake & L Renson (eds), Nonlinear structures and systems, volume 1: Proceedings of the 37th IMAC, a conference and exposition on structural dynamics 2019. Conference Proceedings of the Society for Experimental Mechanics Series, Springer Verlag, Cham, pp. 217-220, 37th IMAC, A Conference and Exposition on Structural Dynamics, 2019, Orlando, United States, 28 Jan 2019. https://doi.org/10.1007/978-3-030-12391-8_29
Anastasio, D., Noël, J. P., Kerschen, G., Marchesiello, S., Häfele, J., Gebhardt, C. G., Rolfes, R., & Dietrich, J. (2019). Dynamics of geometrically-nonlinear beam structures, part 2: Experimental analysis. In G. Kerschen, M. R. W. Brake, & L. Renson (Eds.), Nonlinear structures and systems, volume 1: Proceedings of the 37th IMAC, a conference and exposition on structural dynamics 2019 (pp. 217-220). (Conference Proceedings of the Society for Experimental Mechanics Series). Springer Verlag. https://doi.org/10.1007/978-3-030-12391-8_29
Anastasio D, Noël JP, Kerschen G, Marchesiello S, Häfele J, Gebhardt CG et al. Dynamics of geometrically-nonlinear beam structures, part 2: Experimental analysis. In Kerschen G, Brake MRW, Renson L, editors, Nonlinear structures and systems, volume 1: Proceedings of the 37th IMAC, a conference and exposition on structural dynamics 2019. Cham: Springer Verlag. 2019. p. 217-220. (Conference Proceedings of the Society for Experimental Mechanics Series). doi: 10.1007/978-3-030-12391-8_29
Anastasio, D. ; Noël, J. P. ; Kerschen, G. et al. / Dynamics of geometrically-nonlinear beam structures, part 2 : Experimental analysis. Nonlinear structures and systems, volume 1: Proceedings of the 37th IMAC, a conference and exposition on structural dynamics 2019. editor / Gaetan Kerschen ; M.R.W. Brake ; Ludovic Renson. Cham : Springer Verlag, 2019. pp. 217-220 (Conference Proceedings of the Society for Experimental Mechanics Series).
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