Temperature-induced variations in structural dynamic characteristics part I: experimental

C. E. Woon; Larry D. Mitchell

doi:10.1117/12.248648

23 August 1996 Temperature-induced variations in structural dynamic characteristics part I: experimental

C. E. Woon, Larry D. Mitchell

Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996) https://doi.org/10.1117/12.248648
Event: Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1996, Ancona, Italy

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.

Citation Download Citation

C. E. Woon and Larry D. Mitchell "Temperature-induced variations in structural dynamic characteristics part I: experimental", Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); https://doi.org/10.1117/12.248648

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