DEVELOPMENT OF A HYDROSTATIC JOURNAL BEARING WITH SLIT-STEP COMPENSATION

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This paper describes the mathematical modeling and initial testing of an oil-hydrostatic bearing that derives compensation from both a central radial slit where fluid enters and stepped clearances near each end. Bearings using either a radial slit or stepped clearances for compensation were well studied over forty years ago by Donaldson. These bearings have smooth bores uninterrupted with multiple recesses around the circumference. The present slit-step bearing achieves the best of both types with somewhat higher hydrostatic stiffness than the slit bearing and fluid shear drag lower than the step bearing. This is apparent in TABLE 1, which compares calculated ... continued below

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Hale, L C; Donaldson, R R; Castro, C; Chung, C A & Hopkins, D J July 28, 2006.

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This paper describes the mathematical modeling and initial testing of an oil-hydrostatic bearing that derives compensation from both a central radial slit where fluid enters and stepped clearances near each end. Bearings using either a radial slit or stepped clearances for compensation were well studied over forty years ago by Donaldson. These bearings have smooth bores uninterrupted with multiple recesses around the circumference. The present slit-step bearing achieves the best of both types with somewhat higher hydrostatic stiffness than the slit bearing and fluid shear drag lower than the step bearing. This is apparent in TABLE 1, which compares calculated values of initial (i.e., centered) hydrostatic stiffness for each type. The slit-step bearing is one of several types being studied at Lawrence Livermore National Laboratory for possible use on the Precision Optical Grinder and Lathe (POGAL).

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PDF-file: 6 pages; size: 94.8 Kbytes

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  • Presented at: American Society of Precision Engineering, 2006 Annual Meeting, Monterey, CA, United States, Oct 15 - Oct 20, 2006

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  • Report No.: UCRL-PROC-223368
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 919231
  • Archival Resource Key: ark:/67531/metadc883564

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Office of Scientific & Technical Information Technical Reports

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  • July 28, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 23, 2016, 3:30 p.m.

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Hale, L C; Donaldson, R R; Castro, C; Chung, C A & Hopkins, D J. DEVELOPMENT OF A HYDROSTATIC JOURNAL BEARING WITH SLIT-STEP COMPENSATION, article, July 28, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc883564/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.