Operational modal analysis based prediction of actual stress in an offshore structural model

Marius Glindtvad Tarpø, Bruna Silva Nabuco, Anders Skafte, Julie Kristoffersen, Jonas Vestermark, Sandro Diord Rescinho Amador, Rune Brincker

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    In this paper the accuracy of predicting stresses directly from the operational responses is investigated. The basic approach to the stress prediction is to perform an operational modal analysis (OMA) and then applying a modal filtering to the operating response, so that the modal coordinates of all significant modes are known. Next, the experimental mode shapes are expanded using a finite element (FE) model together with the local correspondence principle to estimate the displacements in all degrees of freedom of the FE model, and strain is predicted using the strain mode shapes. The accuracy of the approach is assessed by comparing the predicted and measured strains.
    Original languageEnglish
    JournalProcedia Engineering
    Pages (from-to)2262-2267
    Number of pages6
    Publication statusPublished - 2017
    EventX International Conference on Structural Dynamics - Sapienza University of Rome, Rome, Italy
    Duration: 10 Sept 201713 Sept 2017
    Conference number: 10


    ConferenceX International Conference on Structural Dynamics
    LocationSapienza University of Rome


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