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Prediction of natural frequency variability due to uncertainty in material propertiesComposite materials are widely used in various types of modern engineering structures. Traditional studies on composite structures have been based on the assumption that the material properties of the composites are characterized by a priori known elastic moduli, and no uncertainties of these moduli have been considered. However, the composite materials are invariably subject to a certain amount of scatter in their measured elastic moduli. To a large extent, the properties of composite materials are dependent on the fabrication process. But even the composite materials manufactured by the same process demonstrate differences in their elastic properties. This paper proposes a new, non-probabilistic method to predict the variability in the natural frequencies of the composite cylindrical shell, resulting from the unavoidable scatter in elastic moduli. The available measurements of elastic moduli are fitted by the four-dimensional uncertainty ellipsoid. The upper and lower bounds of the natural frequency are derived. With these bounds, designers will have a better understanding of the real dynamic behavior of the structure.
Document ID
19950004905
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Li, Y. W.
(Florida Atlantic Univ. Boca Raton, FL, United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Inst. of Noise Control Engineering, Noise Con 1994: Proceedings of the 1994 National Conference on Noise Control Engineering. Progress in Noise Control for Industry
Subject Category
Composite Materials
Accession Number
95N11318
Funding Number(s)
CONTRACT_GRANT: NAG1-1310
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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