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:
Hashimoto H.1, Matsumoto K.2
Affiliation:
1. Dept. of Mechanical Engineering, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan 2. Graduate School of Engineering, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan
Abstract
This paper describes the optimum design methodology for improving operating characteristics of hydrodynamic journal bearings and its application to elliptical journal bearing design used in high-speed rotating machinery. The hybrid optimization technique combining the direct search method and the successive quadratic programming is applied effectively to find the optimum solutions. In the optimum design of elliptical journal bearings, the design variables such as vertical and horizontal radial clearances, bearing length-to-diameter ratio and bearing orientation angle are determined to minimize the objective function defined by the weighted sum of maximum averaged oil film temperature rise, leakage flow rate, and the inversion of whirl onset speed of the journal under many constraints. The results obtained are shown in graphical form for a wide range of journal rotational speed. Comparing the optimized operating characteristics with the characteristics calculated from the random selected design variables, the effectiveness of optimum design is clarified.
Publisher
ASME International
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference21 articles.
1. Pinkus, O.
, 1956, “Analysis of Elliptical Bearings,” Trans. ASME, 78, pp. 965–973. 2. 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. 3. 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. 4. 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. 5. Vaidyanathan, K., and Keith, T. G., 1989, “Numerical Prediction of Cavitation in Noncircular Journal Bearings,” STLE Tribol. Trans., 32, No. 2, pp. 215–224.
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