A first step in quantifying the value of OMA based fatigue stress estimation

Bruna Nabuco, Henning Brüske, Michael Faber, Rune Brincker

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Citation (Scopus)

Abstract

To facilitate the modelling of the fatigue life of an offshore structure, a methodology based on the Operational Modal Analysis (OMA) is proposed. The idea is to utilize monitoring results as a means to reduce uncertainties associated with structural responses and to take benefit of this information to optimize assets integrity management. In the present work a scaled model of a structure is considered for which the displacements are measured under random excitation. The strains at any point of the model structure are estimated based on OMA and the accuracy is assessed and verified by comparing the estimates with strain gauge measurements. The obtained strains are used to evaluate the equivalent stress range, which is further used to compute fatigue failure probabilities as well as risk estimates. Obtaining information comes at a cost, which is quantified using value of information analysis. The value of information assessment is illustrated through a principal example.

Original languageEnglish
Title of host publication8th IOMAC - International Operational Modal Analysis Conference, Proceedings
EditorsSandro D. R. Amador, Rune Brincker, Evangelos I. Katsanos, Manuel Lopez Aenlle, Pelayo Fernandez
Number of pages8
PublisherInternational Group of Operational Modal Analysis Conference (IOMAC)
Publication date2019
Pages645-652
ISBN (Electronic)9788409049004
Publication statusPublished - 2019
Event8th International Operational Modal Analysis Conference, IOMAC 2019 - Copengahen, Denmark
Duration: 13 May 201915 May 2019

Conference

Conference8th International Operational Modal Analysis Conference, IOMAC 2019
CountryDenmark
CityCopengahen
Period13/05/201915/05/2019
SponsorBruel and Kjaer, Gfai Tech, Siemens, Structural Vibration Solutions

Bibliographical note

Funding Information:
The authors would like to thank Anders Skafte for sharing and providing input data from experiments in order to evaluate the results achieved in this paper. The authors acknowledge the funding received from Centre for Oil and Gas – DTU/Danish Hydrocarbon Research and Technology Centre (DHRTC).

Funding Information:
The authors would like to thank Anders Skafte for sharing and providing input data from experiments in order to evaluate the results achieved in this paper. The authors acknowledge the funding received from Centre for Oil and Gas - DTU/Danish Hydrocarbon Research and Technology Centre (DHRTC).

Publisher Copyright:
© 2019 International Group of Operational Modal Analysis.

Keywords

  • Fatigue stress
  • Offshore structure
  • Value of information

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