The results of a combined analytical and experimental investigation of the unbalance vibrations of a rotor are presented. The analysis applies to a general rotor-bearing system in which the dynamic bearing forces are represented by four spring coefficients and four damping coefficients. The rotor can be represented as either a lumped or a distributed parameter system, and gyroscopic moments are included. In general, the unbalance whirl motion of the rotor will be elliptical. The analysis has been programmed for a digital computer to obtain results for comparison with the experimental data. The test rotor is a uniform, flexible shaft with heavy wheels mounted at the ends and in the middle. The rotor is supported in two silicone fluid-lubricated, tilting-pad bearings. The rotor amplitude caused by an induced unbalance has been measured over a speed range of 3000 to 24,000 rpm for three different rotor configurations, obtained by removing one or both end wheels. This speed range extends to or through the third critical speed for each of the rotor configurations. The results are compared with the theoretical values and, in general, the agreement is found to be good.
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November 1967
This article was originally published in
Journal of Engineering for Industry
Research Papers
Calculations and Experiments on the Unbalance Response of a Flexible Rotor
J. W. Lund,
J. W. Lund
Vibrations and Acoustics, Mechanical Technology Inc., Latham, N. Y.
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F. K. Orcutt
F. K. Orcutt
Mechanical Technology Inc., Latham, N. Y.
Search for other works by this author on:
J. W. Lund
Vibrations and Acoustics, Mechanical Technology Inc., Latham, N. Y.
F. K. Orcutt
Mechanical Technology Inc., Latham, N. Y.
J. Eng. Ind. Nov 1967, 89(4): 785-796
Published Online: November 1, 1967
Article history
Received:
December 1, 1966
Online:
August 25, 2011
Citation
Lund, J. W., and Orcutt, F. K. (November 1, 1967). "Calculations and Experiments on the Unbalance Response of a Flexible Rotor." ASME. J. Eng. Ind. November 1967; 89(4): 785–796. https://doi.org/10.1115/1.3610155
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