Finite Element Modeling of Dynamic Behavior of Some Basic Structural Members

[+] Author and Article Information
R. C. Engels

The University of Tennessee Space Institute, Tullahoma, TN 37388

J. Vib. Acoust 114(1), 3-9 (Jan 01, 1992) (7 pages) doi:10.1115/1.2930231 History: Received April 01, 1990; Revised January 01, 1991; Online June 17, 2008


A method is described to model the dynamics of finite elements. The assumed modes method is used to show how static shape functions approximate the element mass distribution. The deterioration of the modal content of a model can be linked to the neglect of interface restrained assumed modes. Restoration of a few of these modes leads to higher accuracy with fewer generalized coordinates compared to the standard consistent mass matrix approach. Also, no need exists for subdivision of basic elements such as rods and beams. The mass and stiffness matrices for several basic elements are derived and used in demonstration problems.

Copyright © 1992 by The American Society of Mechanical Engineers
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