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Model updating using uncertain experimental modal data

Govers, Yves and Link, Michael (2011) Model updating using uncertain experimental modal data. In: Proceedings "IFASD 2011". IFASD 2011 - 15th International Forum on Aeroelasticity and Structural Dynamics, 26 - 30 June 2011, Paris, Frankreich.



The propagation of parameter uncertainty in structural dynamics has become a feasible method to determine the probabilistic description of the vibration response of industrial scale �nite element models. Though methods for uncertainty propagation have been developed extensively, the quanti�cation of parameter uncertainty has been neglected in the past. But a correct assumption for the parameter variability is essential for the estimation of the uncertain vibration response. This paper shows how to identify model parameter means and covariance matrix from uncertain experimental modal test data. The common gradient based approach from deterministic computational model updating was extended by an equation that accounts for the stochastic part. In detail an inverse approach for the identi�cation of statistical parametric properties will be presented which will be applied on a numerical model of a replica of the GARTEUR SM-AG19 benchmark structure. The uncertain eigenfrequencies and mode shapes have been determined in an extensive experimental modal test campaign where the aircraft structure was tested repeatedly while it was 130 times dis- and reassembled in between each experimental modal analysis.

Item URL in elib:https://elib.dlr.de/70272/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Model updating using uncertain experimental modal data
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Link, MichaelUniversity of Kassel, Institute for Statics and DynamicsUNSPECIFIED
Journal or Publication Title:Proceedings "IFASD 2011"
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:stochastic finite element model updating, uncertainty, modal testing, structural dynamics.
Event Title:IFASD 2011 - 15th International Forum on Aeroelasticity and Structural Dynamics
Event Location:Paris, Frankreich
Event Type:international Conference
Event Dates:26 - 30 June 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:03 Nov 2011 11:25
Last Modified:31 Jul 2019 19:32

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