Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

Karsten Krautwald Vesterholm*, Tobias Friis, Evangelos Katsanos, Rune Brincker, Anders Brandt

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Identification of modal parameters, when a structure is under operational conditions is termed Operational Modal Analysis (OMA). Current OMA techniques are based on the assumption of linear time-invariant systems, and thus have limited applicability when applied to structures known to violate these assumptions. The present study investigates how the Random Decrement (RD) technique can improve robustness of OMA methods when friction-induced nonlinear damping is present in a system. This is done by estimating the amplitude dependent damping. A friction mechanism is introduced in a model of a structure, and by applying the RD technique at different amplitudes of simulated responses, RD signatures are produced, that represent the system vibrating with these amplitude levels. This allows the modal parameters to be estimated based on RD signatures computed with each amplitude level, using time domain parameter estimation methods, and the amplitude dependency of the damping is identified.
Original languageEnglish
Title of host publicationDynamics of Civil Structures
EditorsShamim Pakzad
Volume2
PublisherSpringer
Publication date2020
Pages17-25
ISBN (Print)978-3-030-12114-3
ISBN (Electronic)978-3-030-12115-0
DOIs
Publication statusPublished - 2020
EventInternational Modal Analysis Conference - Orlando, United States
Duration: 28. Jan 201931. Jan 2019
Conference number: 37
https://sem.org/imac

Conference

ConferenceInternational Modal Analysis Conference
Number37
CountryUnited States
CityOrlando
Period28/01/201931/01/2019
Internet address
SeriesConference Proceedings of the Society for Experimental Mechanics Series
ISSN2191-5644

Fingerprint

Modal analysis
Damping
Friction
Parameter estimation

Keywords

  • Random decrement
  • Random vibrations
  • Friction-induced nonlinear dmping
  • Operational modal analysis
  • Identification of nonlinearity
  • Friction-induced Nonlinear damping

Cite this

Vesterholm, K. K., Friis, T., Katsanos, E., Brincker, R., & Brandt, A. (2020). Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. In S. Pakzad (Ed.), Dynamics of Civil Structures (Vol. 2, pp. 17-25). Springer. Conference Proceedings of the Society for Experimental Mechanics Series https://doi.org/10.1007/978-3-030-12115-0_3
Vesterholm, Karsten Krautwald ; Friis, Tobias ; Katsanos, Evangelos ; Brincker, Rune ; Brandt, Anders. / Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. Dynamics of Civil Structures. editor / Shamim Pakzad. Vol. 2 Springer, 2020. pp. 17-25 (Conference Proceedings of the Society for Experimental Mechanics Series).
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abstract = "Identification of modal parameters, when a structure is under operational conditions is termed Operational Modal Analysis (OMA). Current OMA techniques are based on the assumption of linear time-invariant systems, and thus have limited applicability when applied to structures known to violate these assumptions. The present study investigates how the Random Decrement (RD) technique can improve robustness of OMA methods when friction-induced nonlinear damping is present in a system. This is done by estimating the amplitude dependent damping. A friction mechanism is introduced in a model of a structure, and by applying the RD technique at different amplitudes of simulated responses, RD signatures are produced, that represent the system vibrating with these amplitude levels. This allows the modal parameters to be estimated based on RD signatures computed with each amplitude level, using time domain parameter estimation methods, and the amplitude dependency of the damping is identified.",
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author = "Vesterholm, {Karsten Krautwald} and Tobias Friis and Evangelos Katsanos and Rune Brincker and Anders Brandt",
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Vesterholm, KK, Friis, T, Katsanos, E, Brincker, R & Brandt, A 2020, Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. in S Pakzad (ed.), Dynamics of Civil Structures. vol. 2, Springer, Conference Proceedings of the Society for Experimental Mechanics Series, pp. 17-25, International Modal Analysis Conference, Orlando, United States, 28/01/2019. https://doi.org/10.1007/978-3-030-12115-0_3

Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. / Vesterholm, Karsten Krautwald; Friis, Tobias; Katsanos, Evangelos; Brincker, Rune; Brandt, Anders.

Dynamics of Civil Structures. ed. / Shamim Pakzad. Vol. 2 Springer, 2020. p. 17-25 (Conference Proceedings of the Society for Experimental Mechanics Series).

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

T1 - Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

AU - Vesterholm, Karsten Krautwald

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AU - Katsanos, Evangelos

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AU - Brandt, Anders

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AB - Identification of modal parameters, when a structure is under operational conditions is termed Operational Modal Analysis (OMA). Current OMA techniques are based on the assumption of linear time-invariant systems, and thus have limited applicability when applied to structures known to violate these assumptions. The present study investigates how the Random Decrement (RD) technique can improve robustness of OMA methods when friction-induced nonlinear damping is present in a system. This is done by estimating the amplitude dependent damping. A friction mechanism is introduced in a model of a structure, and by applying the RD technique at different amplitudes of simulated responses, RD signatures are produced, that represent the system vibrating with these amplitude levels. This allows the modal parameters to be estimated based on RD signatures computed with each amplitude level, using time domain parameter estimation methods, and the amplitude dependency of the damping is identified.

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KW - Friction-induced Nonlinear damping

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Vesterholm KK, Friis T, Katsanos E, Brincker R, Brandt A. Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. In Pakzad S, editor, Dynamics of Civil Structures. Vol. 2. Springer. 2020. p. 17-25. (Conference Proceedings of the Society for Experimental Mechanics Series). https://doi.org/10.1007/978-3-030-12115-0_3