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A Benchmark Problem for Development of Autonomous Structural Modal IdentificationThis paper summarizes modal identification results obtained using an autonomous version of the Eigensystem Realization Algorithm on a dynamically complex, laboratory structure. The benchmark problem uses 48 of 768 free-decay responses measured in a complete modal survey test. The true modal parameters of the structure are well known from two previous, independent investigations. Without user involvement, the autonomous data analysis identified 24 to 33 structural modes with good to excellent accuracy in 62 seconds of CPU time (on a DEC Alpha 4000 computer). The modal identification technique described in the paper is the baseline algorithm for NASA's Autonomous Dynamics Determination (ADD) experiment scheduled to fly on International Space Station assembly flights in 1997-1999.
Document ID
19970010002
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Pappa, Richard S. (NASA Langley Research Center Hampton, VA United States)
Woodard, Stanley E. (NASA Langley Research Center Hampton, VA United States)
Juang, Jer-Nan (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1996
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
NASA-TM-110291
NAS 1.15:110291
Accession Number
97N15259
Funding Number(s)
PROJECT: RTOP 237-03-33-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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