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

Marius Tarpø | Zendy; Brubuco | Zendy; Anders Skafte | Zendy; Julie Caroee Kristoffersen | Zendy; Jonas Vestermark | Zendy; Sandro Amador | Zendy; Rune Brincker | Zendy

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

Author(s) -

Marius Tarpø,

Brubuco,

Anders Skafte,

Julie Caroee Kristoffersen,

Jonas Vestermark,

Sandro Amador,

Rune Brincker

Publication year - 2017

Publication title -

procedia engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.32

H-Index - 74

ISSN - 1877-7058

DOI - 10.1016/j.proeng.2017.09.234

Subject(s) - modal , finite element method , mode (computer interface) , modal analysis , structural engineering , modal testing , operational modal analysis , degrees of freedom (physics and chemistry) , engineering , stress (linguistics) , computer science , materials science , physics , linguistics , philosophy , quantum mechanics , polymer chemistry , operating system

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.

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