Identification of friction-coupled offshore platforms by output-only method

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

Identification of friction-coupled offshore platforms by output-only method

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

University of Southern Denmark

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

Abstract

A structural health monitoring (SHM) program can improve the structural integrity of offshore structures, however, the SHM scheme implies extraction of linear time-invariant modal parameters by Operational Modal Analysis (OMA). Inherently, the offshore platforms are nonlinear, and in many cases, the dynamics of the platforms are involving a friction-induced coupling that stems from bearings in the bridges connecting the platforms. This mechanism is causing the platforms to interchange between acting either as one system or separate systems, depending on the sliding or sticking state of the bearings. Along these lines, the present paper proposes an identification framework employing nonlinearity optimised random decrement (NORD) and OMA parameter estimation methods to identify two sets of underlying linear modes, relative to the state of the friction-induced coupling, both from the same measurement record.

Original language	English
Title of host publication	Proceedings of the 29th International Ocean and Polar Engineering Conference
Number of pages	6
Publisher	International Society of Offshore & Polar Engineers
Publication date	2019
ISBN (Electronic)	978-1-880653-85-2
Publication status	Published - 2019
Event	29th International Ocean and Polar Engineering Conference (ISOPE 2019) - Honolulu, United States Duration: 16 Jun 2019 → 21 Jun 2019

Conference

Conference	29th International Ocean and Polar Engineering Conference (ISOPE 2019)
Country/Territory	United States
City	Honolulu
Period	16/06/2019 → 21/06/2019

Keywords

Operational modal analysis
Response dependent identification
Friction-coupled systems
Nonlinear dynamics
Random decrement technique
Nonlinearity optimised random decrement
NORD

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title = "Identification of friction-coupled offshore platforms by output-only method",

abstract = "A structural health monitoring (SHM) program can improve the structural integrity of offshore structures, however, the SHM scheme implies extraction of linear time-invariant modal parameters by Operational Modal Analysis (OMA). Inherently, the offshore platforms are nonlinear, and in many cases, the dynamics of the platforms are involving a friction-induced coupling that stems from bearings in the bridges connecting the platforms. This mechanism is causing the platforms to interchange between acting either as one system or separate systems, depending on the sliding or sticking state of the bearings. Along these lines, the present paper proposes an identification framework employing nonlinearity optimised random decrement (NORD) and OMA parameter estimation methods to identify two sets of underlying linear modes, relative to the state of the friction-induced coupling, both from the same measurement record.",

keywords = "Operational modal analysis, Response dependent identification, Friction-coupled systems, Nonlinear dynamics, Random decrement technique, Nonlinearity optimised random decrement, NORD",

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

year = "2019",

language = "English",

booktitle = "Proceedings of the 29th International Ocean and Polar Engineering Conference",

publisher = "International Society of Offshore & Polar Engineers",

note = "29th International Ocean and Polar Engineering Conference (ISOPE 2019) ; Conference date: 16-06-2019 Through 21-06-2019",

}

Friis, T, Vesterholm, KK, Katsanos, EI, Brandt, A & Brincker, R 2019, Identification of friction-coupled offshore platforms by output-only method. in Proceedings of the 29th International Ocean and Polar Engineering Conference. International Society of Offshore & Polar Engineers, 29th International Ocean and Polar Engineering Conference (ISOPE 2019), Honolulu, Hawaii, United States, 16/06/2019.

Identification of friction-coupled offshore platforms by output-only method. / Friis, Tobias; Vesterholm, Karsten K.; Katsanos, Evangelos I. et al.
Proceedings of the 29th International Ocean and Polar Engineering Conference. International Society of Offshore & Polar Engineers, 2019.

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

TY - GEN

T1 - Identification of friction-coupled offshore platforms by output-only method

AU - Friis, Tobias

AU - Vesterholm, Karsten K.

AU - Katsanos, Evangelos I.

AU - Brandt, Anders

AU - Brincker, Rune

PY - 2019

Y1 - 2019

N2 - A structural health monitoring (SHM) program can improve the structural integrity of offshore structures, however, the SHM scheme implies extraction of linear time-invariant modal parameters by Operational Modal Analysis (OMA). Inherently, the offshore platforms are nonlinear, and in many cases, the dynamics of the platforms are involving a friction-induced coupling that stems from bearings in the bridges connecting the platforms. This mechanism is causing the platforms to interchange between acting either as one system or separate systems, depending on the sliding or sticking state of the bearings. Along these lines, the present paper proposes an identification framework employing nonlinearity optimised random decrement (NORD) and OMA parameter estimation methods to identify two sets of underlying linear modes, relative to the state of the friction-induced coupling, both from the same measurement record.

AB - A structural health monitoring (SHM) program can improve the structural integrity of offshore structures, however, the SHM scheme implies extraction of linear time-invariant modal parameters by Operational Modal Analysis (OMA). Inherently, the offshore platforms are nonlinear, and in many cases, the dynamics of the platforms are involving a friction-induced coupling that stems from bearings in the bridges connecting the platforms. This mechanism is causing the platforms to interchange between acting either as one system or separate systems, depending on the sliding or sticking state of the bearings. Along these lines, the present paper proposes an identification framework employing nonlinearity optimised random decrement (NORD) and OMA parameter estimation methods to identify two sets of underlying linear modes, relative to the state of the friction-induced coupling, both from the same measurement record.

KW - Operational modal analysis

KW - Response dependent identification

KW - Friction-coupled systems

KW - Nonlinear dynamics

KW - Random decrement technique

KW - Nonlinearity optimised random decrement

KW - NORD

M3 - Article in proceedings

BT - Proceedings of the 29th International Ocean and Polar Engineering Conference

PB - International Society of Offshore & Polar Engineers

T2 - 29th International Ocean and Polar Engineering Conference (ISOPE 2019)

Y2 - 16 June 2019 through 21 June 2019

ER -

Identification of friction-coupled offshore platforms by output-only method

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Conference

Keywords

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