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TECHNICAL PAPERS

Piston Ring-Cylinder Bore Friction Modeling in Mixed Lubrication Regime: Part II—Correlation With Bench Test Data

[+] Author and Article Information
Ozgen Akalin, Golam M. Newaz

Wayne State University, Department of Mechanical Engineering, Detroit, MI 48202

J. Tribol 123(1), 219-223 (Dec 29, 1999) (5 pages) doi:10.1115/1.1286338 History: Received October 22, 1998; Revised December 29, 1999
Copyright © 2001 by ASME
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References

Figures

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Developed test system: (a) air cylinder; (b) normal load sensor; (c) loading arm; (d) force gage; (e) heater; (f ) cylinder liner holder; (g) encoder; (h) detachable crankshaft; and (i) linear bearings
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Developed force-gage (“d” in Fig. 1) and ring holder
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Cylinder bore segment (detail cannot be seen in Fig. 1)
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Effect of speed (model predictions): (a) lubricant film thickness; (b) load carried by surface asperities; (c) load carried by oil film pressure; and (d) cavitation location as a function of crank angle position
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Effect of running speed on friction coefficient: (a) predicted and (b) experimental
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Effect of normal load (model predictions): (a) lubricant film thickness; (b) load carried by surface asperities; (c) load carried by oil film pressure; and (d) cavitation location as a function of crank angle position
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Effect of normal load on friction coefficient: (a) predicted and (b) experimental
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Effect of temperature (model predictions): (a) lubricant film thickness; (b) load carried by surface asperities; (c) load carried by oil film pressure; and (d) cavitation location as a function of crank angle position
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Effect of surface roughness: (a) predicted friction coefficient at 70°C and (b) experimental friction coefficient at 70°C
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Comparison of predicted and experimental results for selected cases: (a) friction coefficient for cast-iron bore at 70°C, σ=0.71 μm Rq and (b) friction coefficient for cast-iron bore at 24°C, σ=0.41 μm Rq

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