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TECHNICAL PAPERS

Improvement of Operating Characteristics of High-Speed Hydrodynamic Journal Bearings by Optimum Design: Part I— Formulation of Methodology and Its Application to Elliptical Bearing Design

[+] Author and Article Information
H. Hashimoto

Dept. of Mechanical Engineering, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japane-mail: hiromu@keyaki.cc.u-tokai.ac.jp

K. Matsumoto

Graduate School of Engineering, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan

J. Tribol 123(2), 305-312 (Jun 08, 2000) (8 pages) doi:10.1115/1.1308019 History: Received May 20, 1999; Revised June 08, 2000
Copyright © 2001 by ASME
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References

Pinkus,  O., 1956, “Analysis of Elliptical Bearings,” Trans. ASME, 78, pp. 965–973.
Glinecke,  J., Han,  D. C., and Leonhard,  M., 1980, “Practical Determination and Use of Bearing Dynamic Coefficients,” Tribol. Int., 15, No. 6, pp. 297–309.
Li,  D. F., Choy,  K. C., and Allaire,  P. E., 1980, “Stability and Transient Characteristics of Four Multilobe Journal Bearing Configurations,” ASME J. Lubr. Technol., 102, pp. 291–298.
Kumar,  A., Shinhasan,  R., and Sihgh,  D. V., 1980, “Performance Characteristics of Two-Lobe Hydrodynamic Journal Bearings,” ASME J. Lubr. Technol., 102, pp. 425–429.
Vaidyanathan,  K., and Keith,  T. G., 1989, “Numerical Prediction of Cavitation in Noncircular Journal Bearings,” STLE Tribol. Trans., 32, No. 2, pp. 215–224.
Hashimoto,  H., 1992, “Dynamic Characteristic Analysis of Short Elliptical Journal Bearings in Turbulent Inertial Flow Regime,” STLE Tribol. Trans., 35, No. 4, pp. 619–626.
Mongkolwongrojn,  M., Prabkeaw,  C., and Hashimoto,  H., 1995, “Theoretical Prediction of Journal Center Motion Trajectory in Two-Lobe Hydrodynamic Journal Bearings,” JSME Int. J. Ser. C., 38, No. 2, pp. 319–325.
Booser,  E. R., Missana,  A., and Ryan,  F. D., 1970, “Performance of Large Steam Turbine Journal Bearings,” ASLE Trans., 13, pp. 262–268.
Hashimoto,  H., Wada,  S., and Tsunoda,  H., 1984, “Performance Characteristics of Elliptical Journal Bearings in Turbulent Flow Regime,” Bull. JSME, 27, No. 232, pp. 2265–2271.
Rode,  S. M., 1972, “A Demonstrably Optimum One-Dimensional Journal Bearing,” ASME J. Lubr. Technol., 94, pp. 188–192.
Asimov, M., 1966, Introduction to Engineering Design, McGraw-Hill, New York.
Beightler,  C. S., Lo,  T. C., and Rylander,  H. G., 1970, “Optimal Design by Geometric Programming,” J. Eng. Ind., 92, pp. 191–196.
Seireg,  A., and Ezzat,  H., 1969, “Optimum Design of Hydrodynamic Journal Bearings,” ASME J. Lubr. Technol., 91, pp. 516–523.
Hashimoto,  H., and Kato,  Y., 1987, “A Study on the Characteristics Analysis of High-Speed Journal Bearings (Optimum Design of Journal Bearings),” JSME Int. J., 30, No. 2, pp. 632–637.
Hashimoto,  H., 1997, “Optimum Design of High-Speed, Short Journal Bearings by Mathematical Programming,” STLE Tribol. Trans., 40, No. 2, pp. 283–293.
Hashimoto, H., 1998, “Optimization of Oil Flow Rate and Oil Film Temperature Rise in High Speed Hydrodynamic Journal Bearing,” Tribology for Energy Conservation, Proc. 24th Leeds-Lyon Symposium on Tribology, pp. 205–210.
Hashimoto,  H., and Wada,  S., 1989, “Theoretical Approach to Turbulent Lubrication Problems Including Surface Roughness Effects,” ASME J. Tribol., 111, No. 1, pp. 17–22.
Hashimoto,  H., and Mongkolwongrojn,  M., 1994, “Adiabatic Approximate Solution for Static and Dynamic Characteristics of Turbulent Partial Journal Bearings With Surface Roughness,” ASME J. Tribol., 116, No. 4, pp. 672–680.
Hashimoto,  H., 1997, “Surface Roughness Effects in High-Speed Hydrodynamic Journal Bearings,” ASME J. Tribol., 119, No. 4, pp. 776–780.
Rao, S. S., 1996, Engineering Optimization; Theory and Practice, John Wiley and Sons, pp. 487–520.
Mikami,  M., Kumagai,  S., Uno,  S., and Hashimoto,  H., 1988, “Static and Dynamic Characteristics of Rolling-Pad Journal Bearings in Super-Laminar Flow Regime,” ASME J. Tribol., 110, No. 1, pp. 73–79.

Figures

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Flow chart of optimum design methodology for high-speed hydrodynamic journal bearing
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Geometry of elliptical journal bearing
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Variation of optimized vertical radial clearance with journal rotational speed
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Variation of optimized horizontal radial clearance with journal rotational speed
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Variation of optimized bearing width-to-diameter ratio with journal rotational speed
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Variation of optimized bearing orientation angle with journal rotational speed
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Variation of optimized ellipticity ratio with journal rotational speed
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Variation of maximum averaged oil film temperature across the film thickness with journal rotational speed
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Variation of leakage oil flow rate with journal rotational speed
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Variation of whirl onset speed with journal rotational speed
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Relation between oil film components and pressure distribution in optimized elliptical journal bearings for W=2 [kN],ns=140 [rps],λopt=0.513,CHopt=130 [μm], and CVopt=84.4 [μm]

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