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Title: Torsional and bending vibration measurement on rotors using laser technology
Authors: Miles, Toby J.
Lucas, Margaret
Halliwell, Neil A.
Rothberg, Steve
Issue Date: 1999
Publisher: Elsevier (© Academic Press Ltd)
Citation: MILES, T.J. ... et al, 1999. Torsional and bending vibration measurement on rotors using laser technology. Journal of Sound and Vibration, 226 (3), pp. 441 - 467.
Abstract: Based on the principles of laser Doppler velocimetry, the laser torsional vibrometer (LTV) was developed for non-contact measurement of torsional oscillation of rotating shafts, offering significant advantages over conventional techniques. This paper describes comprehensive theory to account for the sensitivity of the LTV's measurements to shaft motion in all degrees of freedom. The optical geometry of the LTV offers inherent immunity to translational motion of the target shaft, either axial or radial. However, its measurements are sensitive to angular lateral vibration of the shaft. The significance of this sensitivity is compared with the instrument noise floor and typical torsional and lateral vibration levels. Optimum alignments of the instrument are then specified to ensure effective immunity to all lateral motion in typical applications. To overcome this problem more reliably, a new technique is proposed permitting unambiguous measurement of pure torsional vibration in situations where use of a single LTV demonstrates unacceptable sensitivity to angular lateral vibrations. Practical application of this technology is demonstrated with torsional vibration measurements from a diesel engine crankshaft. Simultaneously, previously unattained measurements of shaft bending vibration measurements are made. The first bending mode of the crankshaft was identified and its vibration amplitude and damping estimated. This application of laser vibrometry for non-contact measurements of shaft vibration represents a further step forward in the use of this technology for machinery diagnostics.
Description: This article was accepted for publication in the Journal of Sound and Vibration [Elsevier © Academic Press]. The definitive version is available at: http://dx.doi.org/10.1006/jsvi.1999.2253
Version: Accepted for publication
DOI: 10.1006/jsvi.1999.2253
URI: https://dspace.lboro.ac.uk/2134/19748
Publisher Link: http://dx.doi.org/10.1006/jsvi.1999.2253
ISSN: 0022-460X
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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