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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/9664

Title: Rotational vibration measurements using laser doppler vibrometry: comprehensive theory and practical application
Authors: Bell, John R.
Rothberg, Steve
Issue Date: 2000
Publisher: Elsevier © Academic Press
Citation: BELL, J.R. and ROTHBERG, S.J., 2000. Rotational vibration measurements using laser doppler vibrometry: comprehensive theory and practical application. Journal of Sound and Vibration, 238 (4), pp. 673 - 690.
Abstract: This paper builds on a previous study of the velocity sensed by a single laser vibrometer beam incident on a target in an arbitrary direction to predict the velocity sensed by multiple laser beams with arbitrary orientations. The usefulness of parallel beam arrangements is demonstrated and a concise new theory for the difference velocity sensitivity for two parallel beams is presented. Parallel beam arrangements for Virtually unambiguous measurement of torsional vibration are presented along with arrangements that allow measurement of the pitch and yaw vibration to be derived. Resolution of individual pitch and yaw motions is shown not to be possible by any geometrical arrangement of the beams but a post-processing technique that enables the genuine pitch and yaw vibrations to be estimated from the measurements of the pitch and yaw vibration sets is demonstrated and validated experimentally in the laboratory. Measurements of pitch and yaw vibration are, for the first time, obtained from the crank-shaft of a running diesel engine, enabling identification of the first natural frequency of the crank-shaft in bending.
Description: This article was published in the Journal of Sound and Vibration [Elsevier © Academic Press] and the definitive version is available at: http://dx.doi.org/10.1006/jsvi.2000.3134
Version: Accepted for publication
DOI: 10.1006/jsvi.2000.3134
URI: https://dspace.lboro.ac.uk/2134/9664
Publisher Link: http://dx.doi.org/10.1006/jsvi.2000.3134
ISSN: 0022-460X
Appears in Collections:Published Articles (Mechanical and Manufacturing Engineering)

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