This paper describes a novel experimental procedure for measuring the four velocity or damping coefficients of an Oil Film Journal Bearing from imposed dynamic orbits. All four damping coefficients are derived from one imposed journal center dynamic orbit and, therefore, may be regarded as being obtained at the same time. The method requires the production of a “figure of eight” shaped orbit and utilizes the “cross-over” point therein. Coefficients are initially evaluated in a coordinate system which is chosen to align with the designated parts of the measured orbit. Each coefficient is then separately evaluated from single values of instantaneous imposed force and resulting journal center velocity. Coefficients are then converted into any other desired axes system. All the benefits of the original selected orbit technique are retained. The presented method places much less severe demands on experimental procedure. An available example illustrates the technique. A realistic uncertainty analysis for this example is included. Indications are provided which show how the orbit features may be adjusted to substantially reduce uncertainty.
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October 1995
Research Papers
Measurement of Oil Film Journal Bearing Damping Coefficients—An Extension of the Selected Orbit Technique
D. W. Parkins
D. W. Parkins
School of Industrial and Manufacturing Science, Cranfield University, Cranfield, Beds. MK43 0AL, United Kingdom
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D. W. Parkins
School of Industrial and Manufacturing Science, Cranfield University, Cranfield, Beds. MK43 0AL, United Kingdom
J. Tribol. Oct 1995, 117(4): 696-701 (6 pages)
Published Online: October 1, 1995
Article history
Received:
February 11, 1994
Revised:
October 15, 1994
Online:
January 24, 2008
Citation
Parkins, D. W. (October 1, 1995). "Measurement of Oil Film Journal Bearing Damping Coefficients—An Extension of the Selected Orbit Technique." ASME. J. Tribol. October 1995; 117(4): 696–701. https://doi.org/10.1115/1.2831539
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