Identifying Wave Loads During Random Seas Using Structural Response

Michael Vigsø, Rune Brincker, Christos T. Georgakis

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Structural monitoring is increasingly becoming everyday business in
    the offshore industry. The monitoring may target the strain estimation
    or focus on tracking the changes in the dynamic properties of the
    structure in order to predict damages at remote / or possibly subsea
    locations. This paper will show that by monitoring the structural
    response, it is also possible to indirectly estimate the wave loading
    acting on the system. This information can be used to increase
    confidence in the load probability models for the structural design or
    aid the health monitoring procedure. During ambient vibration, the
    principles of operational modal analysis (OMA) are applied to harvest
    the dynamic properties of the structure. Successively, a dynamic
    model is formulated and used to calculate the loading from a random
    sea state using the response of the structure. A laboratory experiment
    is conducted in a wave flume at LASIF, Marseille, France, where a
    scaled offshore model is equipped with accelerometers to monitor the
    structural response during a random sea. The study shows that it is
    possible to use the structure as a dynamic load cell and monitor the
    loads occurring in actual conditions. Both the short time variations
    and the load spectra can be computed successfully using the structural
    Original languageEnglish
    Title of host publicationProcedings of the 29th International Ocean and Polar Engineering Conference, ISOPE
    PublisherInternational Society of Offshore & Polar Engineers
    Publication date2019
    Article numberISOPE-I-19-635
    ISBN (Print)978-1-880653-85-2
    Publication statusPublished - 2019
    Event29th International Ocean and Polar Engineering Conference (ISOPE 2019) - Honolulu, United States
    Duration: 16 Jun 201921 Jun 2019


    Conference29th International Ocean and Polar Engineering Conference (ISOPE 2019)
    Country/TerritoryUnited States


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


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