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

Technical University of 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	The 29th International Ocean and Polar Engineering Conference
Editors	Jin S. Chung, Odd M. Akselsen, HyunWoo Jin, Hiroyasu Kawai, Yongwon Lee, Dmitri Matskevitch, Suak Ho Van, Decheng Wan, Alan M. Wang, Satoru Yamaguchi
Number of pages	6
Publisher	International Society of Offshore & Polar Engineers
Publication date	2019
Pages	1331-1336
ISBN (Print)	9781880653852
Publication status	Published - 2019
Event	The 29th International Ocean and Polar Engineering Conference - Honolulu, United States Duration: 16. Jun 2019 → 21. Jun 2019 Conference number: 29

Conference

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

Series	Proceedings of the International Offshore and Polar Engineering Conference
Volume	1
ISSN	1098-6189

Keywords

Operational Modal Analysis
Response dependent identification
friction-coupled systems
nonlinear dynamics
random decrement technique
nonlinearity optimised random decrement
NORD

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
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Cite this

Friis, T., Vesterholm, K. K., Katsanos, E. I., Brandt, A., & Brincker, R. (2019). Identification of friction-coupled offshore platforms by output-only method. In J. S. Chung, O. M. Akselsen, H. Jin, H. Kawai, Y. Lee, D. Matskevitch, S. Ho Van, D. Wan, A. M. Wang, & S. Yamaguchi (Eds.), The 29th International Ocean and Polar Engineering Conference (pp. 1331-1336). International Society of Offshore & Polar Engineers.

Friis, Tobias ; Vesterholm, Karsten K. ; Katsanos, Evangelos I. et al. / Identification of friction-coupled offshore platforms by output-only method. The 29th International Ocean and Polar Engineering Conference. editor / Jin S. Chung ; Odd M. Akselsen ; HyunWoo Jin ; Hiroyasu Kawai ; Yongwon Lee ; Dmitri Matskevitch ; Suak Ho Van ; Decheng Wan ; Alan M. Wang ; Satoru Yamaguchi. International Society of Offshore & Polar Engineers, 2019. pp. 1331-1336 (Proceedings of the International Offshore and Polar Engineering Conference, Vol. 1).

@inproceedings{f82e9e3a4bbb43af90a210c54b56d5cb,

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",

isbn = "9781880653852",

series = "Proceedings of the International Offshore and Polar Engineering Conference",

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

pages = "1331--1336",

editor = "Chung, {Jin S.} and Akselsen, {Odd M.} and HyunWoo Jin and Hiroyasu Kawai and Yongwon Lee and Dmitri Matskevitch and {Ho Van}, Suak and Decheng Wan and Wang, {Alan M.} and Satoru Yamaguchi",

booktitle = "The 29th International Ocean and Polar Engineering Conference",

note = "The 29th International Ocean and Polar Engineering Conference, ISOPE ; 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 JS Chung, OM Akselsen, H Jin, H Kawai, Y Lee, D Matskevitch, S Ho Van, D Wan, AM Wang & S Yamaguchi (eds), The 29th International Ocean and Polar Engineering Conference. International Society of Offshore & Polar Engineers, Proceedings of the International Offshore and Polar Engineering Conference, vol. 1, pp. 1331-1336, The 29th International Ocean and Polar Engineering Conference, 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.
The 29th International Ocean and Polar Engineering Conference. ed. / Jin S. Chung; Odd M. Akselsen; HyunWoo Jin; Hiroyasu Kawai; Yongwon Lee; Dmitri Matskevitch; Suak Ho Van; Decheng Wan; Alan M. Wang; Satoru Yamaguchi. International Society of Offshore & Polar Engineers, 2019. p. 1331-1336 (Proceedings of the International Offshore and Polar Engineering Conference, Vol. 1).

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

N1 - Conference code: 29

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

AN - SCOPUS:85078853621

SN - 9781880653852

T3 - Proceedings of the International Offshore and Polar Engineering Conference

SP - 1331

EP - 1336

BT - The 29th International Ocean and Polar Engineering Conference

A2 - Chung, Jin S.

A2 - Akselsen, Odd M.

A2 - Jin, HyunWoo

A2 - Kawai, Hiroyasu

A2 - Lee, Yongwon

A2 - Matskevitch, Dmitri

A2 - Ho Van, Suak

A2 - Wan, Decheng

A2 - Wang, Alan M.

A2 - Yamaguchi, Satoru

PB - International Society of Offshore & Polar Engineers

T2 - The 29th International Ocean and Polar Engineering Conference

Y2 - 16 June 2019 through 21 June 2019

ER -

Friis T, Vesterholm KK, Katsanos EI, Brandt A, Brincker R. Identification of friction-coupled offshore platforms by output-only method. In Chung JS, Akselsen OM, Jin H, Kawai H, Lee Y, Matskevitch D, Ho Van S, Wan D, Wang AM, Yamaguchi S, editors, The 29th International Ocean and Polar Engineering Conference. International Society of Offshore & Polar Engineers. 2019. p. 1331-1336. (Proceedings of the International Offshore and Polar Engineering Conference, Vol. 1).

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

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Related research output

Random Decrement Based Vibration Analysis of Nonlinear Systems

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