Experimental Study of Freely Alignable Journal Bearings—Part 1: Static Characteristics

Author:

Tieu A. K.1,Qiu Z. L.1

Affiliation:

1. Department of Mechanical Engineering, University of Wollongong, NSW 2500, Australia

Abstract

The characteristics of two misaligned journal bearings were experimentally studied. A bearing test rig was developed. The experimental journal was freely alignable in two possibly misaligned journal bearings. In Part 1, the static characteristics, such as the distributions of oil film thickness and the pressure and temperature of two misaligned bearings, are measured; the relationships of eccentricity, attitude angle, and side flow to the Sommerfeld number are experimentally determined. In Part 2, the traditional harmonic excitation method is extended to estimate the sixteen dynamic force coefficients of two misaligned journal bearings. Sixteen force coefficients of two circular journal bearings, each with two axial grooves, are estimated and the threshold stable speeds are predicted. Various experimental errors and the uncertainty of the estimated coefficients are analyzed.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Reference17 articles.

1. Asanabe, S., Akahoshi, M., and Asai, R., 1972 “Theoretical and Experimental Investigation on Misaligned Journal Bearing Performance,” Tribology Convention, The Inst, of Mech. Eng., London, paper C36/71.

2. Bannister, R. H., 1976, “A Theoretical and Experimental Investigation Illustrating the Influence of Non-Linearity and Misalignment on the Eight Oil Film Force Coefficients,” Conf. Vibrations in Rotating Machinery, Inst. Mech. Eng., pp. 271–78.

3. Brockwell, K., and Deochowski, W., 1989 “Experimental Determination of the Journal Bearing Oil Film Coefficients by the Method of Selective Vibration Orbits,” Rotating Machinery Dynamics, DE 18–1, ASME Publication, pp. 251–259.

4. Dubois, G. B., Ocvirk, F. W., and Wehe, R. L., 1955 “Experimental Investigation of Misaligning Couples and Eccentricity at Ends of Misaligned Plain Bearings,” NACA Technical Note 3352, Washington.

5. Dubois G. B. , OcvirkF. W., and WeheR. L., 1957, “Properties of Misaligned Journal Bearings,” Trans. ASME, Vol. 79, pp. 1205–1212.

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