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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Abstract

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
Volume199
Pages (from-to)2262-2267
Number of pages6
ISSN1877-7058
DOIs
Publication statusPublished - 2017
EventX International Conference on Structural Dynamics - Sapienza University of Rome, Rome, Italy
Duration: 10 Sep 201713 Sep 2017
Conference number: 10

Conference

ConferenceX International Conference on Structural Dynamics
Number10
LocationSapienza University of Rome
CountryItaly
CityRome
Period10/09/201713/09/2017

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