Quantitative Assessment of Mass Discretization in Structural Dynamic Modeling

[+] Author and Article Information
K. M. Vashi

Generation Technology Systems Division, Westinghouse Electric Corporation, Pittsburgh, Pa. 15230

J. Pressure Vessel Technol 108(4), 401-405 (Nov 01, 1986) (5 pages) doi:10.1115/1.3264804 History: Received August 21, 1984; Revised January 30, 1986; Online November 05, 2009


For dynamic analysis of majority of structures, a dynamic model is developed by discretizing the distributed mass and elastic properties. For assessing the adequacy of mass discretization, several procedures are used. These procedures include a comparison of analysis with test, parametric studies using finer mass discretizations, and lump mass spacing according to a frequency-controlled span length of a simply supported beam. This paper presents a quantitative assessment of mass discretization by utilizing exact analytical solution to the discrete problem of beam and bar vibrations. The assessment examines the effect of mass discretization on the accuracy of natural frequencies, modes and participation factors. In one modeling rule, the total number of dynamic degrees of freedom is taken to be twice the number of lower frequencies to be computed with a reasonable amount of accuracy. The assessment in this paper provides support for this rule.

Copyright © 1986 by ASME
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