Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

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

^*Corresponding author for this work

Technical University of 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
Editors	Shamim Pakzad
Volume	2
Publisher	Springer
Publication date	2020
Pages	17-25
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 - 2020
Event	International Modal Analysis Conference - Orlando, United States Duration: 28. Jan 2019 → 31. Jan 2019 Conference number: 37 https://sem.org/imac

Conference

Conference	International Modal Analysis Conference
Number	37
Country/Territory	United States
City	Orlando
Period	28/01/2019 → 31/01/2019
Internet address	https://sem.org/imac

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

Keywords

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

Documents & Links

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

Open Access VersionAccepted manuscript, 234 KB

1 Ph.D. thesis

Random Decrement Based Vibration Analysis of Nonlinear Systems
Vesterholm, K. K., 31. Mar 2021, Syddansk Universitet. Det Tekniske Fakultet. 252 p.
Research output: Thesis › Ph.D. thesis

Open Access
File

1 Conference presentations

Output-Only Estimation of Amplitude Dependent Friction-Induced Damping
Vesterholm, K. K. (Speaker)
28. Jan 2019 → 31. Jan 2019
Activity: Talks and presentations › Conference presentations

Cite this

@inproceedings{49d39d7ed62a4be5a0ea94da61ca0b5f,

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",

author = "Vesterholm, {Karsten Krautwald} and Tobias Friis and Evangelos Katsanos and Rune Brincker and Anders Brandt",

year = "2020",

doi = "10.1007/978-3-030-12115-0_3",

language = "English",

isbn = "978-3-030-12114-3",

volume = "2",

series = "Conference Proceedings of the Society for Experimental Mechanics Series",

publisher = "Springer",

pages = "17--25",

editor = "Shamim Pakzad",

booktitle = "Dynamics of Civil Structures",

address = "Germany",

note = "International Modal Analysis Conference, IMAC ; Conference date: 28-01-2019 Through 31-01-2019",

url = "https://sem.org/imac",

}

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 et al.
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 proceeding › Article in proceedings › Research › peer-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

N1 - Conference code: 37

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.

KW - Random decrement

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

M3 - Article in proceedings

SN - 978-3-030-12114-3

VL - 2

T3 - Conference Proceedings of the Society for Experimental Mechanics Series

SP - 17

EP - 25

BT - Dynamics of Civil Structures

A2 - Pakzad, Shamim

PB - Springer

T2 - International Modal Analysis Conference

Y2 - 28 January 2019 through 31 January 2019

ER -

Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

Abstract

Conference

Keywords

Documents & Links

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Related research output

Random Decrement Based Vibration Analysis of Nonlinear Systems

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Output-Only Estimation of Amplitude Dependent Friction-Induced Damping

Cite this