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8 September 1994 Measurement of translational and angular vibration using a scanning laser Doppler vibrometer
Anthony B. Stanbridge, David J. Ewins
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Proceedings Volume 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1994) https://doi.org/10.1117/12.185354
Event: Vibration Measurements by Laser Techniques: First International Conference, 1994, Ancona, Italy
Abstract
An experimental procedure for measuring angular rotation vibration as well as translation, using a continuously-scanning Laser Doppler Vibrometer, is described. Sinusoidal scanning enables one angular vibration component to be measured but, by circular scanning, two principal angular vibrations and their direction can be derived directly from the frequency response sidebands. Examples of sine excitation measurements on a rigid cube are given. Processes of narrow-band random excitation and modal analysis are illustrated with reference to measurements on a freely-suspended beam. The laser beam was scanned by using x-y axis deflection mirrors; if this facility was not available, circular scanning could probably be achieved by using a rotating tilted mirror. Sideband frequency response references were obtained by using multiplied excitation force and mirror-drive signals.
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Anthony B. Stanbridge and David J. Ewins "Measurement of translational and angular vibration using a scanning laser Doppler vibrometer", Proc. SPIE 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (8 September 1994); https://doi.org/10.1117/12.185354
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KEYWORDS
Doppler effect
Mirrors
Modal analysis
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