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Real time identification of large space structuresIdentification of frequencies, damping ratios, and mode shapes of large space structures (LSSs) are examined in real time. Real time processing allows for quick updates of model processing after a reconfiguration of structural failure. Recursive lattice least squares (RLLS) was selected as the baseline algorithm for the identification. Simulation results on a one dimensional LSS demonstrated that it provides good estimates, was not ill-conditioned in the presence of under-excited modes, allowed activity by a supervisory control system which prevented damage to the LSS or excessive drift, and was capable of real-time processing for typical LSS models. A suboptimal version of RLLS, which is equivalent to simulated parallel processing, was derived. A NASTRAN model of the dual keel U.S. space station was used to demonstrate the input/identification algorithm package in a more realistic simulation. Because the first eight flexible modes were very close together, the identification was much more difficult than in the simple examples. Even so, the model was accurately identified in real time.
Document ID
19870007434
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Voss, Janice E.
(Draper (Charles Stark) Lab., Inc. Boston, MA, United States)
Date Acquired
September 5, 2013
Publication Date
February 1, 1987
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
NASA-CR-171957
NAS 1.26:171957
CSDL-T-941
Accession Number
87N16867
Funding Number(s)
CONTRACT_GRANT: NAS9-17560
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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