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Comparison of several system identification methods for flexible structuresIn the last few years various methods of identifying structural dynamics models from modal testing data have appeared. A comparison is presented of four of these algorithms: the Eigensystem Realization Algorithm (ERA), the modified version ERA/DC where DC indicated that it makes use of data correlation, the Q-Markov Cover algorithm, and an algorithm due to Moonen, DeMoor, Vandenberghe, and Vandewalle. The comparison is made using a five mode computer module of the 20 meter Mini-Mast truss structure at NASA Langley Research Center, and various noise levels are superimposed to produced simulated data. The results show that for the example considered ERA/DC generally gives the best results; that ERA/DC is always at least as good as ERA which is shown to be a special case of ERA/DC; that Q-Markov requires the use of significantly more data than ERA/DC to produce comparable results; and that is some situations Q-Markov cannot produce comparable results.
Document ID
19910012261
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lew, J.-S. (Old Dominion Univ. Norfolk, VA., United States)
Juang, Jer-Nan (NASA Langley Research Center Hampton, VA, United States)
Longman, Richard W. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1991
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.15:104046
NASA-TM-104046
Meeting Information
Meeting: Structures, Structural Dynamics and Materials Conference
Location: Baltimore, MD
Country: United States
Start Date: April 8, 1991
End Date: April 10, 1991
Accession Number
91N21574
Funding Number(s)
PROJECT: RTOP 590-14-21-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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