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Variance computation of the modal assurance criterion

Publikation: Bidrag til bog/antologi/rapport/proceeding › Konferencebidrag i proceedings › Forskning › peer review

Links

  • S. Gres
  • M. Döhler, Institut National de Recherche en Informatique et en Automatique
    • ,
  • P. Andersen, Structural Vibration Solutions A/S, Aalborg
    • ,
  • L. Mevel, Institut National de Recherche en Informatique et en Automatique

Modal validation is an integral part of any modal analysis scheme. Recent advances in efficient variance computation of modal parameter estimates from the output-only subspace-based identification algorithms made the computation of variance feasible for the modal parameters, such as natural frequencies, damping ratios and mode shapes. One of the other practical modal indicators is Modal Assurance Criterion (MAC), for which uncertainty computation scheme is missing. This paper builds on the previous results using the propagation of the measurement uncertainties to estimates of MAC. The sensitivity of the MAC with respect to output covariances is derived using a first order perturbations and the uncertainties are propagated using the Delta method. The influence of the underlying mode shape scaling on both the uncertainty of mode shapes and MAC is investigated. The results are presented in context of operational modal analysis (OMA) of a spring mass system.

OriginalsprogEngelsk
TitelProceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics
RedaktørerD. Moens, W. Desmet, B. Pluymers, W. Rottiers
Antal sider12
UdgivelsesstedKU Leuven
ForlagKU Leuven, Departement Werktuigkunde
Udgivelsesår2018
Sider2939-2950
ISBN (Elektronisk)9789073802995
StatusUdgivet - 2018
Eksternt udgivetJa
Begivenhed28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018 - Leuven, Belgien
Varighed: 17 sep. 2018 → 19 sep. 2018

Konference

Konference28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018
LandBelgien
ByLeuven
Periode17/09/2018 → 19/09/2018
SerietitelProceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD2018 - International Conference on Uncertainty in Structural Dynamics

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