Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

Karsten K. Vesterholm; Tobias Friis; Evangelos Katsanos; Rune Brincker; Anders  Brandt

doi:10.1007/978-3-030-12115-0_3

Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

Karsten K. Vesterholm, Tobias Friis, Evangelos Katsanos, Rune Brincker, Anders Brandt

University of Southern Denmark

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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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.

Original language	English
Title of host publication	Dynamics of Civil Structures : Proceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics 2019
Volume	2
Publisher	Springer
Publication date	2019
Pages	17-25
Chapter	3
ISBN (Print)	978-3-030-12114-3
ISBN (Electronic)	978-3-030-12115-0
DOIs	https://doi.org/10.1007/978-3-030-12115-0_3
Publication status	Published - 2019
Event	IMAC-XXXVII Conference and Exposition on Structural Dynamics 2019: It's not just modal anymore - Rosen Plaza Hotel, Orlando, United States Duration: 28 Jan 2019 → 31 Jan 2019 Conference number: 37 https://eventegg.com/sem-imac/

Conference

Conference	IMAC-XXXVII Conference and Exposition on Structural Dynamics 2019
Number	37
Location	Rosen Plaza Hotel
Country/Territory	United States
City	Orlando
Period	28/01/2019 → 31/01/2019
Internet address	https://eventegg.com/sem-imac/

Series	Conference Proceedings of the Society for Experimental Mechanics Series
ISSN	2191-5644

Keywords

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

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10.1007/978-3-030-12115-0_3

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title = "Output-Only Estimation of Amplitude Dependent Friction-Induced Damping",

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 K.} 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 2019, Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. in Dynamics of Civil Structures: Proceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics 2019. vol. 2, Springer, Conference Proceedings of the Society for Experimental Mechanics Series, pp. 17-25, IMAC-XXXVII Conference and Exposition on Structural Dynamics 2019, Orlando, Florida, 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 K.; Friis, Tobias; Katsanos, Evangelos et al.
Dynamics of Civil Structures: Proceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics 2019. Vol. 2 Springer, 2019. p. 17-25 (Conference Proceedings of the Society for Experimental Mechanics Series).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Vesterholm KK, Friis T, Katsanos E, Brincker R, Brandt A. Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. In Dynamics of Civil Structures: Proceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics 2019. Vol. 2. Springer. 2019. p. 17-25. (Conference Proceedings of the Society for Experimental Mechanics Series). doi: 10.1007/978-3-030-12115-0_3

Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

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Keywords

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