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Shock and Vibration
Volume 3, Issue 3, Pages 223-232

Comparison of Mechanical Impedance Methods for Vibration Simulation

Jeffrey A. Gatscher1 and Grzegorz Kawiecki2

1Raytheon Company, Bristol, TN 37620, USA
2The University of Tennessee, Knoxville, TN 37996, USA

Received 8 May 1995; Accepted 12 December 1995

Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The work presented here explored the detrimental consequences that resulted when mechanical impedance effects were not considered in relating vibration test requirements with field measurements. The ways in which these effects can be considered were evaluated, and comparison of three impedance methods was accomplished based on a cumulative damage criterion. A test structure was used to simulate an equipment and support foundation system. Detailed finite element analysis was performed to aid in computation of cumulative damage totals. The results indicate that mechanical impedance methods can be effectively used to reproduce the field vibration environment in a laboratory test. The establishment of validated computer models, coupled with laboratory impedance measurements, can eliminate the overtesting problems inherent with constant motion, infinite impedance testing strategies.