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Parameter estimation for distributed parameter models of complex, flexible structuresDistributed parameter modeling of structural dynamics has been limited to simple spacecraft configurations because of the difficulty of handling several distributed parameter systems linked at their boundaries. Although there is other computer software able to generate such models or complex, flexible spacecraft, unfortunately, neither is suitable for parameter estimation. Because of this limitation the computer software PDEMOD is being developed for the express purposes of modeling, control system analysis, parameter estimation and structure optimization. PDEMOD is capable of modeling complex, flexible spacecraft which consist of a three-dimensional network of flexible beams and rigid bodies. Each beam has bending (Bernoulli-Euler or Timoshenko) in two directions, torsion, and elongation degrees of freedom. The rigid bodies can be attached to the beam ends at any angle or body location. PDEMOD is also capable of performing parameter estimation based on matching experimental modal frequencies and static deflection test data. The underlying formulation and the results of using this approach for test data of the Mini-MAST truss will be discussed. The resulting accuracy of the parameter estimates when using such limited data can impact significantly the instrumentation requirements for on-orbit tests.
Document ID
19930071799
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Taylor, Lawrence W., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1991
Subject Category
Spacecraft Design, Testing And Performance
Meeting Information
Meeting: IFAC and IFORS, Symposium in Identification and System Parameter Estimation
Location: Budapest
Country: Hungary
Start Date: July 8, 1991
End Date: July 12, 1991
Sponsors: 1FAC, IFORS
Accession Number
93A55796
Distribution Limits
Public
Copyright
Other

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