Operational modal analysis on a lighthouse structure subjected to ice actions

Torodd S. Nord, Knut Andreas Kvåle, Oyvind W. Petersen, Morten Bjerkås, Eliz Mari Lourens

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

5 Citations (Scopus)
25 Downloads (Pure)

Abstract

The sea ice interaction with a structure may cause system changes and affect the feasibility of common approaches to track modal parameters. In this paper, a covariance-driven stochastic subspace identification method is used to identify the natural frequencies from 190 time series of ice actions against a lighthouse structure. The results are sorted into groups defined by the observed ice conditions and governing ice failure mechanisms during the ice-structure interaction. The identified natural frequencies vary substantially within each individual group and between the groups. Recordings with flexural failures and a north-south ice-drift direction consistently rendered the same identified frequencies, whereas crushing seemed to create large amounts of variability in the identified frequencies. The results show the need for more high-fidelity data to assess whether modern system identification methods can be used to monitor system changes and support decision-making for operations of structures in ice-infested waters, such as offshore wind structures.

Original languageEnglish
Title of host publicationX International Conference on Structural Dynamics, EURODYN 2017
EditorsFabrizio Vestroni, Vincenzo Gattulli, Francesco Romeo
Pages1014-1019
Number of pages6
Volume199
DOIs
Publication statusPublished - 2017
Event10th international conference on recent advances in structural dynamics - Faculty of Civil and Industrial Engineering of Sapienza University of Rome, Roma, Italy
Duration: 12 Jul 201014 Jul 2010
Conference number: 10
https://www.eurodyn2017.it/

Publication series

NameProcedia Engineering
PublisherElsevier
Volume199
ISSN (Electronic)1877-7058

Conference

Conference10th international conference on recent advances in structural dynamics
Abbreviated titleEURODYN 2017
CountryItaly
CityRoma
Period12/07/1014/07/10
Internet address

Keywords

  • Ice-structure interaction
  • Operational modal analysis
  • System identification

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  • Cite this

    Nord, T. S., Kvåle, K. A., Petersen, O. W., Bjerkås, M., & Lourens, E. M. (2017). Operational modal analysis on a lighthouse structure subjected to ice actions. In F. Vestroni, V. Gattulli, & F. Romeo (Eds.), X International Conference on Structural Dynamics, EURODYN 2017 (Vol. 199, pp. 1014-1019). (Procedia Engineering; Vol. 199). https://doi.org/10.1016/j.proeng.2017.09.268