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Title
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Effects of Rise Time and Damping on Finite Element Analysis of Response of Structures
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Description
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This paper discusses the results of some sensitivity studies on the effects of rise time and viscous damping on the output of a linear finite element code. The results are interpreted by means of modal analysis of the finite element model. Approximate methods are presented for the determination of the highest modal frequency of a uniform grid and spurious oscillations at the highest modal frequency are correlated to the shock spectrum of the forcing function. The effect of damping on shock propagation is described in modal terms. Finally, the effects of modal participation of the forcing function upon finite element models of continua are mentioned.
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Creator
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Farrell, J. J.
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Dai, P. K.
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Abstract
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This paper discusses the results of some sensitivity studies on the effects of rise time and viscous damping on the output of a linear finite element code. The results are interpreted by means of modal analysis of the finite element model. Approximate methods are presented for the determination of the highest modal frequency of a uniform grid and spurious oscillations at the highest modal frequency are correlated to the shock spectrum of the forcing function. The effect of damping on shock propagation is described in modal terms. Finally, the effects of modal participation of the forcing function upon finite element models of continua are mentioned.
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Corporate Author
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TRW Systems Group
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Report Number
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AFFDL TR 71-160 p. 519-536
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Report Availability
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Full text available
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Publisher
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Wright-Patterson Air Force Base, OH : Air Force Flight Dynamics Laboratory, Air Force Systems Command and Air Force Institute of Technology, Air University
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Date
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1973
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Type
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article
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Date Issued
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1973-12
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Provenance
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Bombardier/Aero
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Distribution Classification
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1
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Distribution Conflict
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No
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DTIC Record Exists
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No
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Format
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1 online resource (17 pages) : ill.
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Extent
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17
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Identifier
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AD0785968
