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RESEARCH PAPERS

Selection of Degrees of Freedom for Dynamic Analysis

[+] Author and Article Information
K. W. Matta

General Dynamics, Electric Boat Division, Groton, Conn. 06340

J. Pressure Vessel Technol 109(1), 65-69 (Feb 01, 1987) (5 pages) doi:10.1115/1.3264857 History: Received July 17, 1984; Revised February 06, 1986; Online November 05, 2009

Abstract

A technique for the selection of dynamic degrees of freedom (DDOF) of large, complex structures for dynamic analysis is described and the formulation of Ritz basis vectors for static condensation and component mode synthesis is presented. Generally, the selection of DDOF is left to the judgment of engineers. For large, complex structures, however, a danger of poor or improper selection of DDOF exists. An improper selection may result in singularity of the eigenvalue problem, or in missing some of the lower frequencies. This technique can be used to select the DDOF to reduce the size of large eigenproblems and to select the DDOF to eliminate the singularities of the assembled eigenproblem of component mode synthesis. The execution of this technique is discussed in this paper. Examples are given for using this technique in conjunction with a general purpose finite element computer program GENSAM[1].

Copyright © 1987 by ASME
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