Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

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

*Kontaktforfatter for dette arbejde

Publikation: Bidrag til bog/antologi/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review

Resumé

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.
OriginalsprogEngelsk
TitelDynamics of Civil Structures
RedaktørerShamim Pakzad
Vol/bind2
ForlagSpringer
Publikationsdato2020
Sider17-25
ISBN (Trykt)978-3-030-12114-3
ISBN (Elektronisk)978-3-030-12115-0
DOI
StatusUdgivet - 2020
BegivenhedInternational Modal Analysis Conference - Orlando, USA
Varighed: 28 jan. 201931 jan. 2019
Konferencens nummer: 37
https://sem.org/imac

Konference

KonferenceInternational Modal Analysis Conference
Nummer37
LandUSA
ByOrlando
Periode28/01/201931/01/2019
Internetadresse
NavnConference Proceedings of the Society for Experimental Mechanics Series
ISSN2191-5644

Fingeraftryk

Modal analysis
Damping
Friction
Parameter estimation

Citer dette

Vesterholm, K. K., Friis, T., Katsanos, E., Brincker, R., & Brandt, A. (2020). Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. I S. Pakzad (red.), Dynamics of Civil Structures (Bind 2, s. 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. red. / Shamim Pakzad. Bind 2 Springer, 2020. s. 17-25 (Conference Proceedings of the Society for Experimental Mechanics Series).
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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.",
keywords = "Random decrement, Random vibrations, Friction-induced nonlinear dmping, Operational modal analysis, Identification of nonlinearity, Friction-induced Nonlinear damping",
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Vesterholm, KK, Friis, T, Katsanos, E, Brincker, R & Brandt, A 2020, Output-Only Estimation of Amplitude Dependent Friction-Induced Damping. i S Pakzad (red.), Dynamics of Civil Structures. bind 2, Springer, Conference Proceedings of the Society for Experimental Mechanics Series, s. 17-25, International Modal Analysis Conference, Orlando, USA, 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. red. / Shamim Pakzad. Bind 2 Springer, 2020. s. 17-25 (Conference Proceedings of the Society for Experimental Mechanics Series).

Publikation: Bidrag til bog/antologi/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review

TY - GEN

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

AU - Vesterholm, Karsten Krautwald

AU - Friis, Tobias

AU - Katsanos, Evangelos

AU - Brincker, Rune

AU - Brandt, Anders

PY - 2020

Y1 - 2020

N2 - 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.

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 - Random vibrations

KW - Friction-induced nonlinear dmping

KW - Operational modal analysis

KW - Identification of nonlinearity

KW - Friction-induced Nonlinear damping

U2 - 10.1007/978-3-030-12115-0_3

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

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BT - Dynamics of Civil Structures

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