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INTL - A Strategy for the Identification and Characterization of Non-linearities within Modal Survey Testing

Göge, D. and Füllekrug, U. and Sinapius, M. and Link, M. and Gaul, L. (2004) INTL - A Strategy for the Identification and Characterization of Non-linearities within Modal Survey Testing. In: Proceedings of the International Modal Analysis Confererence IMAC-XXII, Dearborn, Michigan, USA, 2004. IMAC XXII 2004 Conference and Expositon on Structural Dynamics, Dearborn, Michigan, USA, 22-29 January 2004.

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Abstract

Modal identification tests on aircraft prototypes or spacecraft structures like satellites are mainly performed to experimentally identify the structural dynamic behaviour in terms of a modal model. This assumes linear dynamic behaviour of the structure. In practice, most of the investigated and tested structures exhibit some non-linear behaviour. In this paper the INTL (Identification of Non-linearities by Time series based Linearity plots) method which is based on the force-state mapping approach (Masri et al. [1]) is used to identify modal non-linear parameters and to characterize the non-linearity for a single mode of vibration. The method is able to identify any type of non-linear function, including discontinuous functions, even when stiffness and damping non-linearities occur together in a single mode. In the second step of the method linearity plots are created from the restoring force plot by using the Harmonic Balance method. The INTL strategy and its utilization during modal identification testing are described. The application of the method is illustrated by an example. The benefits and the limitations are discussed.

Item URL in elib:https://elib.dlr.de/14420/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2004,
Title:INTL - A Strategy for the Identification and Characterization of Non-linearities within Modal Survey Testing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Göge, D.UNSPECIFIEDUNSPECIFIED
Füllekrug, U.UNSPECIFIEDUNSPECIFIED
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Link, M.UNSPECIFIEDUNSPECIFIED
Gaul, L.UNSPECIFIEDUNSPECIFIED
Date:2004
Journal or Publication Title:Proceedings of the International Modal Analysis Confererence IMAC-XXII, Dearborn, Michigan, USA, 2004
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Society For Experimental Mechanics, Inc.UNSPECIFIED
Status:Published
Keywords:Ground Vibration Tests, Modal Survey Testing, Identification of Non-linearities, Harmonic Balance, Linearity Plots
Event Title:IMAC XXII 2004 Conference and Expositon on Structural Dynamics, Dearborn, Michigan, USA, 22-29 January 2004
Organizer:Society For Experimental Mechanics, Inc.
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Space
DLR - Program:no assignment
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:50

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