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TECHNICAL PAPERS

Numerical Simulation of Engagement of a Wet Clutch With Skewed Surface Roughness

[+] Author and Article Information
H. Gao, G. C. Barber

Department of Mechanical Engineering, Oakland University, Rochester, MI 48309

M. Shillor

Department of Mathematics and Statistics, Oakland University, Rochester, MI 48309

J. Tribol 124(2), 305-312 (Jul 03, 2001) (8 pages) doi:10.1115/1.1402178 History: Received February 02, 2001; Revised July 03, 2001
Copyright © 2002 by ASME
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References

Natsumeda,  S., and Miyoshi,  T., 1994, “Numerical Simulation of Engagement of Paper Based Wet Clutch Facing,” ASME J. Tribol., 116, pp. 232–237.
Berger,  E. J., Sadeghi,  F., and Krousgrill,  C. M., 1997, “Analytical and Numerical Modeling of Engagement of Rough, Permeable, Grooved Wet Clutches,” ASME J. Tribol., 119, pp. 143–148.
Holgerson,  M., 1997, “Apparatus for Measurement of Engagement Characteristics of a Wet Clutch,” Wear, 213, pp. 140–147.
Yang, Y., Lam, R. C., and Fujii, T., 1998, “Prediction of Torque Response During the Engagement of Wet Friction Clutch,” SAE Technical Paper, No. 981097, pp. 233–243.
Jang,  J. M., and Khonsari,  M. M., 1999, “Thermal Characteristics of a Wet Clutch,” ASME J. Tribol., 121, pp. 610–617.
Berger,  E. J., Sadeghi,  F., and Krousgrill,  C. M., 1996, “Finite Element Modeling of Engagement of Rough and Grooved Wet Clutches,” ASME J. Tribol., 118, pp. 137–146.
Berger,  E. J., and Sadeghi,  F., 1997, “Torque Transmission Characteristics of Automatic Transmission Wet Clutches: Experimental Results and Numerical Comparison,” STLE Tribol. Trans., 40, pp. 539–548.
Greenwood,  J., and Williamson,  J., 1966, “Contact of Nominally Flat Surfaces,” Proc. R. Soc. London, Ser. A, 295, pp. 300–319.
Willermet, P. A., 1998, “Topics in Transmission Tribology,” presented at STLE Annual Meeting, Detroit, MI, May 17–21.
Davis,  C. L., Sadeghi,  F., and Krousgrill,  C. M., 2000, “A Simplified Approach to Modeling Thermal Effects in Wet Clutch Engagement: Analytical and Experimental Comparison,” ASME J. Tribol., 122, No. 1, pp. 110–118.
Patir,  N., and Cheng,  H. S., 1979, “Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces,” ASME J. Lubr. Technol., 101, pp. 220–230.
McCool,  J. I., 2000, “Extending the Capability of the Greenwood Williamson Microcontact Model,” ASME J. Tribol., 122, pp. 496–502.
Beavars,  G., and Joseph,  D., 1967, “Boundary Conditions at a Naturally Permeable Wall,” J. Fluid Mech., 30, pp. 197–207.

Figures

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Optical photograph of wet friction materials
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Schematic of wet clutch model
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Variation of film thickness and relative angular velocity during engagement by considering roughness and skewness for a positive friction coefficient curve, σ=5.08 μm and Rsk=−0.36
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Variation of torque during engagement by considering roughness and skewness for a positive friction coefficient curve, σ=5.08 μm and Rsk=−0.36
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Comparison of Gaussian and Weibull asperity height distributions on film thickness and relative angular velocity with a positive friction coefficient curve, σ=5.08 μm and Rsk=−0.36, -Weibull distribution, [[ellipsis]]Gaussian distribution
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Comparison of Gaussian and Weibull asperity height distributions on engagement torque with a positive friction coefficient curve, σ=5.08 μm and Rsk=−0.36, -Weibull distribution, [[ellipsis]]Gaussian distribution
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Comparison of Weibull and Gaussian asperity height distributions on film thickness and relative angular velocity with a negative friction coefficient curve, σ=2.03 μm and Rsk=−0.98, -Weibull distribution; [[ellipsis]]Gaussian distribution
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Effect of friction coefficient curve on torque by considering skewness for σ=5.08 μm and Rsk=−0.36,−f=0.151+0.0059 log(v);[[ellipsis]]f=0.164−0.0036 log(v)
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Comparison of strain predicted by Gaussian and Weibull distributions with a positive friction coefficient curve for σ=5.08 μm and Rsk=−0.36
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Friction coefficient versus velocity curves of run-in and glazed wet friction materials
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Torque response of run-in wet friction materials with σ=2.67 μm,Rsk=−0.57 and f=4×10−5×v3+4×10−5×v2−0.0155×v+0.2384
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Torque response of glazed wet friction materials with σ=2.03 μm,Rsk=−0.98 and f=−0.0001×v3+0.0049×v2−0.0553×v+0.3396
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Projection of phase space trajectories on to angular velocity-angular displacement plane during engagement

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