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A comparison of viscoelastic damping modelsModern finite element methods (FEM's) enable the precise modeling of mass and stiffness properties in what were in the past overwhelmingly large and complex structures. These models allow the accurate determination of natural frequencies and mode shapes. However, adequate methods for modeling highly damped and high frequency dependent structures did not exist until recently. The most commonly used method, Modal Strain Energy, does not correctly predict complex mode shapes since it is based on the assumption that the mode shapes of a structure are real. Recently, many techniques have been developed which allow the modeling of frequency dependent damping properties of materials in a finite element compatible form. Two of these methods, the Golla-Hughes-McTavish method and the Lesieutre-Mingori method, model the frequency dependent effects by adding coordinates to the existing system thus maintaining the linearity of the model. The third model, proposed by Bagley and Torvik, is based on the Fractional Calculus method and requires fewer empirical parameters to model the frequency dependence at the expense of linearity of the governing equations. This work examines the Modal Strain Energy, Golla-Hughes-McTavish and Bagley and Torvik models and compares them to determine the plausibility of using them for modeling viscoelastic damping in large structures.
Document ID
19930009647
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Slater, Joseph C.
(Buffalo Univ. NY., United States)
Belvin, W. Keith
(NASA Langley Research Center Hampton, VA, United States)
Inman, Daniel J.
(Buffalo Univ. NY., United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1993
Publication Information
Publication: The Fifth NASA(DOD Controls-Structures Interaction Technology Conference, Part 1
Subject Category
Structural Mechanics
Accession Number
93N18836
Funding Number(s)
CONTRACT_GRANT: NGT-50541
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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