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)
CountryUnited States


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


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