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Analysis of Sources and Quantification of Uncertainty in Experimental Modal Data

Govers, Yves und Böswald, Marc und Füllekrug, Ulrich und Göge, Dennis und Link, Michael (2006) Analysis of Sources and Quantification of Uncertainty in Experimental Modal Data. In: Proceedings of the International Seminar on Modal Analysis, Seiten 4161-4173. ISMA 2006 - International Conference on Noise & Vibration Engineering, 2006-09-18 - 2006-09-20, Leuven, Belgium (Europe).

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Kurzfassung

The use of uncertainty propagation analysis in conjunction with the finite element method has become more and more popular in recent years due to increasing computer power. Among other things, uncertainty propagation methods are utilized to ensure the robustness of the computational model, or respectively, of the structural design. The determination of fuzzy response data relies heavily on the assumptions made for the variability of the uncertain parameters, mainly because it is impossible to express the scatter of uncertain parameters, like for example joint stiffness parameters, in a mathematical way. Consequently, an inverse approach is required to quantify parameter uncertainties in a finite element model. Computational Model Updating (CMU) techniques offer the possibility to identify model parameters from measured response data. However, statistical test data is required for uncertainty identification by using finite element models and computational model updating techniques. Thus it is necessary to analyze the impact of different possible sources of uncertainty on the test data variability prior to CMU. The paper comprises the results gained from multiple vibration tests performed on a replica of the well known GARTEUR SM-AG19 benchmark structure at the German Aerospace Center (DLR) and subsequent extractions of modal parameters. In particular, the different sources and the corresponding magnitudes of uncertainty are illustrated. This means that special care is taken to uniquely quantify the variability introduced on modal data with respect to different operators, different modal analysis methods, structure dependant scatter, and differences in phase separation testing and phase resonance testing. As a result, a comparison is made to express the variances of the different sources in the experimental modal analysis process which allows for a classification of the error sources (ranking with respect to the relative impact on the variability of the test data). The aim of the identification of the different variances of the miscellaneous sources is to provide a realistic database for subsequent stochastic finite element model updating and to support the selection of meaningful stochastic model updating parameters.

elib-URL des Eintrags:https://elib.dlr.de/45024/
Dokumentart:Konferenzbeitrag (Paper)
Titel:Analysis of Sources and Quantification of Uncertainty in Experimental Modal Data
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Govers, YvesInstitute of AeroelasticityNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Böswald, MarcInstitute of AeroelasticityNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Füllekrug, UlrichInstitute of AeroelasticityNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Göge, DennisInstitute of AeroelasticityNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Link, MichaelUniversity of Kassel, Institute for Statics and DynamicsNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2006
Erschienen in:Proceedings of the International Seminar on Modal Analysis
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 4161-4173
Status:veröffentlicht
Stichwörter:finite element method, computational model updating
Veranstaltungstitel:ISMA 2006 - International Conference on Noise & Vibration Engineering
Veranstaltungsort:Leuven, Belgium (Europe)
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:18 September 2006
Veranstaltungsende:20 September 2006
Veranstalter :Katholieke Universiteit Leuven
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:keine Zuordnung
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):L - keine Zuordnung (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik
Hinterlegt von: Erdmann, Daniela
Hinterlegt am:19 Okt 2006
Letzte Änderung:24 Apr 2024 19:06

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