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Non-linear analysis of aerospace structures with weak non-linearities and coupled modes

Füllekrug, U. and Göge, D. (2005) Non-linear analysis of aerospace structures with weak non-linearities and coupled modes. IMAC XXIII - International Modal Analysis Conference,Orlando, USA, 27-30 January 2005.

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Abstract

The modal identification of large aerospace structures like aircraft prototypes or satellites requires a great experimental effort and sophisticated test concepts in order to assure a high quality for the test results. The conventional modal identification assumes linear dynamic behaviour of the structure. However, in practice most of the investigated and tested structures exhibit some non-linear behaviour. In this article, a test concept suited for the modal identification of large aerospace structures is presented first. Then, the basics for non-linear modal identification within this concept are described. For most of the modes the non-linearity is only weak and most of the non-linear modes can be considered as uncoupled, i.e. other modes are not influenced by the non-linearity of the respective mode. However, some of the non-linear modes may be coupled with other modes. The article describes the theoretical basis for the non-linear modal identification of one single uncoupled mode and for the case of non-linear coupled modes. To illustrate the non-linear modal identification, an analytical model is investigated which features the coupling of two modes. The application of the method to measured data of a large aircraft structure demonstrates that the method can be used to identify the non-linear characteristics of aerospace structures.

Item URL in elib:https://elib.dlr.de/14501/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Non-linear analysis of aerospace structures with weak non-linearities and coupled modes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Füllekrug, U.UNSPECIFIEDUNSPECIFIED
Göge, D.UNSPECIFIEDUNSPECIFIED
Date:2005
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-15
Status:Published
Keywords:Ground Vibration Test, Modal Survey Testing, Identification of Non-Linearities, Coupled Modes
Event Title:IMAC XXIII - International Modal Analysis Conference,Orlando, USA, 27-30 January 2005
Organizer:Society for Experimental Mechanics Inc.
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:56

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