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Title
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An Analytical Model for the Vibration of Viscoelastically Damped Curved Sandwich Beams
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Description
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This paper describes an analytical model for the coupled flexural and longitudinal vibration of a curved sandwich beam system. The system consists of a pair of parallel and identical composite sandwich beams with a viscoelastic damping material forming the core. The ends of the beams may have any physically realizable boundary conditions, but, in this case are assumed to be simply-supported. The governing equations of motion for the forced vibration of the system are derived using the energy method and Hamilton's principle. Both shear and thickness deformation in the adhesive layer is included in the analysis. The solution of the governing equations for the system resonance frequencies and loss factors are obtained ill closed form using the Rayleigh-Ritz method. A parametric study has been conducted to evaluate the effects of curvature, core-thickness and adhesive shear modulus on the system natural frequencies and loss factors. The implications of this parametric study on the damping effectiveness of the system along with some design guidelines are included in the paper.
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Creator
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Rao, Mohan D.
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He, Shulin
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Publisher
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Wright-Patterson Air Force Base, OH : Wright Laboratory, Flight Dynamics Directorate, Air Force Systems Command
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Date
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1991
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Format
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1 online resource (23 pages) : ill.
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Type
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article
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Abstract
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This paper describes an analytical model for the coupled flexural and longitudinal vibration of a curved sandwich beam system. The system consists of a pair of parallel and identical composite sandwich beams with a viscoelastic damping material forming the core. The ends of the beams may have any physically realizable boundary conditions, but, in this case are assumed to be simply-supported. The governing equations of motion for the forced vibration of the system are derived using the energy method and Hamilton's principle. Both shear and thickness deformation in the adhesive layer is included in the analysis. The solution of the governing equations for the system resonance frequencies and loss factors are obtained ill closed form using the Rayleigh-Ritz method. A parametric study has been conducted to evaluate the effects of curvature, core-thickness and adhesive shear modulus on the system natural frequencies and loss factors. The implications of this parametric study on the damping effectiveness of the system along with some design guidelines are included in the paper.
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Date Issued
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1991-08
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Extent
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23
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Corporate Author
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Michigan Technological University
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Laboratory
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Wright Laboratory
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Report Number
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WL-TR-91-3078 Volume II, paged FDC-1 to FDC-23
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DoD Project
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2401
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DoD Task
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240104
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Distribution Conflict
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No
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Index Abstract
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Contrails only
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Photo Quality
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Not Needed
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Distribution Classification
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1
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Report Availability
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Full text available
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Provenance
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University of Colorado Colorado Springs, Kraemer Family Library
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Identifier
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ADA241312
