Indirect Wave Load Estimates Using Operational Modal Analysis: Preliminary Findings

Michael Vigsø, Julie C. Kristoffersen, Rune Brincker, Christos T. Georgakis

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Abstract

Wave loading on offshore structures has proven difficult to quantify through direct full-scale measurements. Therefore, engineers rely on codes and guidelines, numerical simulations, and scaled experiments in the design and as-built evaluation process. In this paper, it is shown that by monitoring the response of the structure and utilizing Operational Modal Analysis (OMA) it is possible to indirectly identify loads, occurring in actual conditions. A method employing modal parameters to establish a response function, which is used to back-calculate the hydrodynamic wave loading of a structure is presented. The process of inverting the system matrices is stabilized by merging the model with linear wave theory and hence constraining the solution to a scaling function of a predefined load distribution. The method is validated through a numerical case study and by wave flume experiments. Both cases are constituted as two-dimensional loading on a semi submerged cantilever cylinder.
Original languageEnglish
Title of host publicationProceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference
PublisherInternational Society of Offshore & Polar Engineers
Publication date2018
Pages284-290
ISBN (Print)978-1-880653-87-6
Publication statusPublished - 2018
Event28th International Ocean and Polar Engineering Conference (ISOPE 2018) - Sapporo, Japan
Duration: 10 Jun 201815 Jun 2018

Conference

Conference28th International Ocean and Polar Engineering Conference (ISOPE 2018)
CountryJapan
CitySapporo
Period10/06/201815/06/2018
SeriesProceedings of the International Offshore and Polar Engineering Conference
ISSN1098-6189

Keywords

  • Wave loading
  • Indirect measurements
  • Operational modal analysis
  • Offshore structures

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