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Modal Identification of Aerospace Structures

Göge, D. (2003) Modal Identification of Aerospace Structures. Seminar, Los Alamos, New Mexico, USA, February 13th 2003.

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The modal identification is a common and necessary procedure performed on large aerospace structures. Aeronautical structures like prototype of new large aircraft have to be investigated within a ground vibration test (GVT) in order to validate the analytical Finite Element Model and to enable reliable flutter predictions for flight tests. Spacecraft structures like large satellites are investigated by so called modal survey tests. Here, the main purpose is also to validate the analytical model. With the validated model the severe dynamic loads which emerge during launch can be predicted. The dynamics of aeronautical structures and spacecraft are characterized by their modal parameters like natural frequencies, mode shapes, modal damping and generalized masses. These modal parameters can be obtained using two different philosophies resp. methods: Modes, which are important within the scope of the certification process can be identified using the phase resonance method. On the other hand, not all modes have to be known with the same precision and to the same extent, e.g. including linearity checks. Here, phase separation techniques, which are nowadays standard in the modal analysis of large aerospace structures, can save time compared with the phase resonance method. In this lecture the theory of modal identification methods is presented. After that we focuses on the performance of vibration tests. The test equipment is described in detail. In the last chapter of the lecture, examples from vibration tests which were recently performed on aerospace structures are shown.

Item URL in elib:https://elib.dlr.de/14371/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2003,
Title:Modal Identification of Aerospace Structures
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Modal Identification, Ground vibration testing, modal survey testing
Event Title:Seminar, Los Alamos, New Mexico, USA, February 13th 2003
Organizer:Los Alamos National Laboratory
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):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:46

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