Effects of Rise Time and Damping on Finite Element Analysis of Response of Structures

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Report Number: AFFDL TR 71-160 p. 519-536
Author(s): Farrell, J. J., Dai, P. K.
Corporate Author(s): TRW Systems Group
Date of Publication: 1973-12
Pages: 17
DoD Task:
Identifier: This paper is part of a conference proceedings. See AD0785968

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.

Provenance: Bombardier/Aero

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