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Determining damping mechanisms in a composite beam by experimental modal analysisA method of estimating the distributed damping parameters of a beam based on measured modal parameters (frequency and damping ratios) is derived. Three different mathematical models were used to model the damping mechanism of a quasi-isotropic pultruded cantilevered beam. These three models were (1) viscous (air) damping, (2) strain-rate damping, and (3) both viscous and strain-rate damping. Values were obtained for each of the damping models as well as the modulus of elasticity of the beam. It is found that the two-parameter damping model provides the best fit to measure modal data. However, the two-parameter damping model can only reproduce the measured damping ratios to within 85 percent.
Document ID
19900035638
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cudney, H. H.
(State Univ. of New York Buffalo, NY, United States)
Inman, D. J.
(New York, State University Buffalo, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1989
Publication Information
Publication: International Journal of Analytical and Experimental Modal Analysis
Volume: 4
ISSN: 0886-9367
Subject Category
Structural Mechanics
Accession Number
90A22693
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-85-0119
CONTRACT_GRANT: F49620-86-C-0111
CONTRACT_GRANT: NSF MSM-83-51807
CONTRACT_GRANT: AF-AFOSR-85-0220
CONTRACT_GRANT: NGT-33-183-802
Distribution Limits
Public
Copyright
Other

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