elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Non-Linear Experimental Modal Analysis and Application to Satellite Test Data

Link, Michael and Böswald, Marc and Laborde, Sebastien and Weiland, Matthias and Calvi, Adriano (2011) Non-Linear Experimental Modal Analysis and Application to Satellite Test Data. In: Proceedings of COMPDYN 2011 - 3rd International Conference on Computational Methods in Structural Dynamics & Earthquake Engineering. COMPDYN 2011 - 3rd International Conference on Computational Methods in Structural Dynamics & Earthquake Engineering, 25.-28. Mai 2011, Korfu, Griechenland.

Full text not available from this repository.

Abstract

The DYNAMITED project realised by a European space industry and university team associated around EADS ASTRIUM and funded by the European Space Agency (ESA) aimed to assess and improve dynamic test data. In the field of post test activities, the detection, characterisation, identification and prediction of the non-linear behaviour of space structures during tests is of prime importance. The paper therefore starts with a short overview of such methods. Present evaluation methods for spacecraft vibration tests are based on the assump-tion of linear structural behaviour. The resonance shifts and frequency response (FRF) peak variations observed in the case of non-linear structural behaviour are generally not reflected in practice by non-linear evaluation procedures. In order to avoid overloading of the struc-ture during the qualification test on a shaking table the dynamic response is generally con-trolled at specified levels and locations by input notching. This approach generates an effectively quasi linear structural behaviour at the different input levels which enables the utilization of classical linear modal extraction tools to be applied separately at each level. However, the measured dynamic responses (transmissibilities) reveal peak shifts and ampli-tude changes depending on the input level of the base excitation. In the paper an approach is presented where three different input levels are used with the response levels controlled to be constant within a narrow frequency band around the dominant resonances. The premises of a technique will be described and how its aim of predicting the responses to not measured input levels is achieved by applying interpolation and extrapolation techniques to the modal data extracted by conventional modal analysis from the transmissibilities measured at three differ-ent input levels. Results are presented from an application of the technique to the vibration test data measured during a typical qualification test campaign of a satellite structure.

Item URL in elib:https://elib.dlr.de/72637/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Non-Linear Experimental Modal Analysis and Application to Satellite Test Data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Link, MichaelUniversity of Kassel, Institute for Statics and DynamicsUNSPECIFIED
Böswald, Marcmarc.boeswald (at) dlr.deUNSPECIFIED
Laborde, SebastienAstrium-EADS, ToulouseUNSPECIFIED
Weiland, MatthiasUniversity of KasselUNSPECIFIED
Calvi, AdrianoESA-ESTECUNSPECIFIED
Date:2011
Journal or Publication Title:Proceedings of COMPDYN 2011 - 3rd International Conference on Computational Methods in Structural Dynamics & Earthquake Engineering
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:structural dynamics, experimental modal analysis, structural non-linearity
Event Title:COMPDYN 2011 - 3rd International Conference on Computational Methods in Structural Dynamics & Earthquake Engineering
Event Location:Korfu, Griechenland
Event Type:international Conference
Event Dates:25.-28. Mai 2011
Organizer:????
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
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:15 Dec 2011 09:07
Last Modified:15 Dec 2011 09:07

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.