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

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

Publikation: Kapitel i bog/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review


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.

TitelThe 29th International Ocean and Polar Engineering Conference
RedaktørerJin S. Chung, Odd M. Akselsen, HyunWoo Jin, Hiroyasu Kawai, Yongwon Lee, Dmitri Matskevitch, Suak Ho Van, Decheng Wan, Alan M. Wang, Satoru Yamaguchi
Antal sider6
ForlagInternational Society of Offshore & Polar Engineers
ISBN (Trykt)9781880653852
StatusUdgivet - 2019
BegivenhedThe 29th International Ocean and Polar Engineering Conference - Honolulu, USA
Varighed: 16. jun. 201921. jun. 2019
Konferencens nummer: 29


KonferenceThe 29th International Ocean and Polar Engineering Conference
NavnProceedings of the International Offshore and Polar Engineering Conference


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