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Proceedings Paper

Temperature-induced variations in structural dynamic characteristics part I: experimental
Author(s): C. E. Woon; Larry D. Mitchell
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Paper Abstract

When using conventional or laser Doppler vibrometer methodologies, the resonance-dwell technique is used to characterize the response shapes of structures vibrating near resonance. If the structure is large (and/or complex) and if high spatial density data is required, data acquisition could take a significant amount of time. During that time, changes in structural characteristics can occur with cause very large variations in the vibration response amplitudes at the same structural point. An understanding is needed of why such changes occur and of how a structure can be stabilized during prolonged dynamic testing. The goal is to make the measured response data as accurate as possible. This paper presents an experimental investigation of the variations in natural frequency caused by short- or long- term temperature changes. The rectangular steel plate natural frequencies were determined at temperatures slightly above and below standard room temperature. Two boundary condition configurations were studied: a clamped (pseudo- cantilever, C-F-F-F) configuration, and a free (F-F-F-F) configuration. The results indicate that natural frequencies decrease with increasing temperature, resulting in large variations in the response near resonances. Furthermore, larger natural frequency variations are observed in the clamped configuration than in the free configuration, indicating that temperature-induced boundary condition effects are important.

Paper Details

Date Published: 23 August 1996
PDF: 12 pages
Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); doi: 10.1117/12.248648
Show Author Affiliations
C. E. Woon, Johnston Controls, Inc. (United States)
Larry D. Mitchell, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 2868:
Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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