### Abstract

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 | |

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 | United States |

City | Orlando |

Period | 28/01/2019 → 31/01/2019 |

Internet address |

Series | Conference Proceedings of the Society for Experimental Mechanics Series |
---|---|

ISSN | 2191-5644 |

### Fingerprint

### Keywords

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

### Cite this

*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

}

*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.

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

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

SP - 17

EP - 25

BT - Dynamics of Civil Structures

A2 - Pakzad, Shamim

PB - Springer

ER -