Variance computation of MAC and MPC for real-valued mode shapes from the stabilization diagram

Szymon Gres, Michael Döhler, Palle Andersen, Laurent Meve

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

Abstract

Recent advances in efficient variance computation of modal parameter estimates from the output-only subspace-based identification algorithms make the modal parameter variance a practical modal indicator, indicating the accuracy of the estimation. A further modal indicator is the Modal Assurance Criterion (MAC), for which a recently developed uncertainty quantification scheme estimates the variance at a fixed model order. The Modal Phase Collinearity (MPC) is another popular indicator, for which an uncertainty scheme is currently missing. Unlike other modal parameters, which are Gaussian distributed, estimates of MAC and MPC are close to the border of their respective distribution support and cannot be approximated as a Gaussian random variable. This paper addresses the respective uncertainty quantification of MAC and MPC. The results are validated in the context of operational modal analysis (OMA) of a spring mass system.

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 pages9
PublisherInternational Operational Modal Analysis Conference (IOMAC)
Publication date2019
Pages525-533
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
Country/TerritoryDenmark
CityCopengahen
Period13/05/201915/05/2019
SponsorSiemens
Series8th IOMAC - International Operational Modal Analysis Conference, Proceedings

Keywords

  • Modal Assurance Criterion
  • Modal Phase Collinearity
  • Operational modal analysis
  • Stabilization diagram
  • Uncertainty quantification

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