A Design Approach for the Systematic Improvement of Support Locations for Vibrating Circuit Cards

[+] Author and Article Information
J. M. Pitarresi, A. V. Di Edwardo

Mechanical and Industrial Engineering Department, State University of New York at Binghamton, Binghamton, New York 13901-6000

J. Electron. Packag 115(1), 118-123 (Mar 01, 1993) (6 pages) doi:10.1115/1.2909291 History: Received September 01, 1991; Revised November 20, 1992; Online April 28, 2008


This paper approaches the problem of improving an initial guess at support locations for a vibrating circuit card so as to increase the first natural frequency of the card. The finite element method and structural dynamic modification techniques are combined with a simple sequential search algorithm to systematically improve the location of point supports for a circuit card populated with components. It is found that the proposed methodology can be useful for determining the support locations of a circuit card so as to increase its fundamental natural frequency. A case study is presented in which the original support locations on an existing commercial power supply circuit card are systematically improved giving a better than two fold increase in the natural frequency. Additionally, finite element modeling approaches for determining the modal characteristics of a circuit card are compared with experimental results.

Copyright © 1993 by The American Society of Mechanical Engineers
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