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Practical Aspects of On-Orbit Modal Identification Using Free-Decay Data.

Schenk, A. and Pappa, R. S. (1) (1992) Practical Aspects of On-Orbit Modal Identification Using Free-Decay Data. AIAA Journal of Spacecraft and Rockets, Volume 29, Number 2, March-April 1992., Number 2, pp. 264-270.

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Future large space structures such as Space Station Freedom cannot be tested as a total structure on earth. Size, zero-g design, and the existing atmosphere conflict with traditional structural dynamic testing. On-orbit modal identification will become necessary. This paper discusses practical aspects of performing such tests using time-domain analysis of free-decay data. The effects of environmental constraints, structural characteristics, and excitation and sensing are reviewed. A recent laboratory application is also discussed. In this test, an on-orbit experiment is simulated using free-decay data and a limited number of excitationand measurement points. The test article is dynamically similar to the truss/solar arrays of Space Station. The identified modal parameters from this simulation correlate well, though not uniquely, with those obtained in a complete modal survey. Practical difficulties in performing the correlation are illustrated. Modal parameters are identified with the Eigensystem Realization Algorithm.

Item URL in elib:https://elib.dlr.de/39493/
Document Type:Article
Additional Information: institution=AIAA, American Institute of Aeronautics and Astronautics, Inc., The Aerospace Center, 370 L'Enfant Promenade, SW, Washington, D.C. 20024-2518., LIDO-Berichtsjahr=1992,
Title:Practical Aspects of On-Orbit Modal Identification Using Free-Decay Data.
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Journal or Publication Title:AIAA Journal of Spacecraft and Rockets, Volume 29, Number 2, March-April 1992.
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Number 2
Page Range:pp. 264-270
Series Name:Volume 29
Keywords:Large Space Structures, On-Orbit Modal Identification, Modal Testing, Controllability, Observability, Eigensystem Realization Algorithm (ERA).
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:UNSPECIFIED
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 10:44

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