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Model verification of large structural systemsA computer program for the application of parameter identification on the structural dynamic models of space shuttle and other large models with hundreds of degrees of freedom is described. Finite element, dynamic, analytic, and modal models are used to represent the structural system. The interface with math models is such that output from any structural analysis program applied to any structural configuration can be used directly. Processed data from either sine-sweep tests or resonant dwell tests are directly usable. The program uses measured modal data to condition the prior analystic model so as to improve the frequency match between model and test. A Bayesian estimator generates an improved analytical model and a linear estimator is used in an iterative fashion on highly nonlinear equations. Mass and stiffness scaling parameters are generated for an improved finite element model, and the optimum set of parameters is obtained in one step.
Document ID
19780023521
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Lee, L. T. (Wiggins (J. H.) Co. Redondo Beach, CA, United States)
Hasselman, T. K. (Wiggins (J. H.) Co. Redondo Beach, CA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1978
Subject Category
Structural Mechanics
Report/Patent Number
TR-78-1300
NASA-CR-150811
Accession Number
78N31464
Funding Number(s)
CONTRACT_GRANT: NAS8-31950
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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