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TECHNICAL PAPERS: Internal Combustion Engines

Design of Capacitance Probes for Oil Film Thickness Measurements Between the Piston Ring and Linear in Internal Combustion Engines

[+] Author and Article Information
D. O. Ducu

Detroit Diesel Corporation, 13400 Outer Drive, West, Detroit, MI 48239-4001

R. J. Donahue

Mercury Marine, W6250 Pioneer Road, Fond du Lac, WI 54936-1939

J. B. Ghandhi

University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706

J. Eng. Gas Turbines Power 123(3), 633-643 (Dec 01, 2000) (11 pages) doi:10.1115/1.1368116 History: Received August 01, 2000; Revised December 01, 2000
Copyright © 2001 by ASME
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References

Ariga, S., “Observations of Transient Oil Consumption with In-Cylinder Variables,” SAE Paper 961910, 1996.
Hamilton,  G. M., and Moore,  S. L., 1974, “The Lubrication of Piston Rings,” Proc. Inst. Mech. Eng., 188, pp. 253–268.
Furuhama,  S., 1959, “A Dynamic Theory of Piston-Ring Lubrication,” Bull. JSME, 2, p. 423.
Sherrington,  I., and Smith,  E. H., 1985, “Experimental Methods for Measuring the Oil-Film Thickness Between the Piston-Rings and Cylinder-Wall of Internal Combustion Engines,” Tribol. Int., 18, No. 6, pp. 315–320.
Stiyer, M. J., and Ghandhi, J. B., 1997, “Direct Calibration of LIF Measurements of the Oil Film Thickness Using the Capacitance Technique,” SAE paper 972859.
Moore,  S. L., and Hamilton,  G. M., 1978, “The Starved Lubrication of Piston Rings in a Diesel Engine,” Journal Mechanical Science, 20, No. 6, pp. 345–352.
Donahue, R. J., 1997, Experimental Studies on Ring Pack Design Parameters and the Analysis of Radial Ring Collapse, Ph.D. thesis, Department of Mechanical Engineering, University of Wisconsin-Madison, 1997.
Ducu, D. O., 1996, Calibration of the Laser-Induced Fluorescence Technique Applied to Oil Film Thickness Measurements on a Diesel Engine Cylinder Liner by Using Capacitance Gauges, Ph.D. thesis, Department of Mechanical Engineering, University of Wisconsin-Madison.
Ostroski, G. M., 1998, The Use of a Dual-Fiber Probe and the Laser-Induced Fluorescence Technique to Study Oil Consumption in a Diesel Engine, M.S. thesis, Department of Mechanical Engineering, University of Wisconsin-Madison.

Figures

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Relative error due to a nonparallel geometry. Solid line, Eq. (18), open symbols derived from numerical solution.
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Procedure for designing a rectangular capacitance probe
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Rectangular capacitance probe
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Calibration of the RC voltage source circuit
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Capacitance probe data, upper graph raw voltage data, lower graph, uncorrected oil film thickness
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Measured surface profile of the top compression ring
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Variation of oil dielectric constant with oil temperature
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Constant potential lines between the capacitance probe electrode and the piston ring (due to symmetry, only the half left of the probe’s axis of symmetry is shown)
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Error in the parallel plate equation due to neglecting fringing effects for rectangular probes of 62 and 127-μm width
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Geometry used to investigate plate effects, (a) ring profile curvature, (b) surface roughness, (c) nonparallel plates
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Relative error due to ring profile curvature, β=0.5. Solid line (Eq. (7)), open symbols derived from numerical solution.
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Relative error due to ring roughness. Solid line, Eq. (16), open symbols derived from numerical solution.

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