Estimating loads from breaking waves using operational modal analysis

• Main Authors: Vigsø, Michael Bonnerup, Georgakis, Christos Thomas
• Format: Other Non-Article Part of Journal/Newspaper
• Language: English
• Published: American Society of Mechanical Engineers 2020
• Subjects: Arctic
• Online Access: https://pure.au.dk/portal/da/publications/estimating-loads-from-breaking-waves-using-operational-modal-analysis(2fb1263e-f2a8-434f-a0e6-5886260ce281).html

Load effects from breaking waves on offshore structures may be a driving point for the design. It is hence important to assess the likelihood of occurrence along the magnitude of the loadsintheeventofanimpact. Traditionally,loadsarepredicted usingwavetheorycombinedwithaloadmodelsuchastheMorison. This paper features an alternative approach in determining the loads from wave breaking. It is demonstrated how the structural response can be used for (indirectly) estimating the magnitudeoftheloadscausedbywavebreaking. Thetheoryisapplied toanexperimentalsetupinawaveflume,whereaflexiblemodel is subjected to loads from breaking waves. The dynamic propertiesaremappedusingoperationalmodalanalysisanditisconsequentlyshownthattheloadscanbeidentifiedusingthevibration measurements.