Advertisement

Cryocoolers 8 pp 305-311 | Cite as

Spiral Flexure Bearing

  • T. E. Wong
  • R. B. Pan
  • H. D. Marten
  • C. Sve
  • L. Galvan
  • T. S. Wall

Abstract

Flexure bearings are a key technology for many long-life, spacecraft-borne cryogenic refrigerator (cryocooler) designs. The bearing provides frictionless, non-wearing, linear movement and radial support for reciprocating machines. Since the maximum operating stress in the flexure is a controlling factor for the cryocooler operating life, this stress must be determined. The objective of the present work was to estimate the stresses in the flexure bearing under static and dynamic deflections.

A typical flexure bearing, which is a spiral-cut diaphragm, was considered. ABAQUS finite element code was used to characterize the flexure performance under static deflection. Analysis results of the flexure deflection correlate well with the measurement. However, the flexure is operated in the cyclic loading condition. Its responses under static and dynamic deflections might be different. DYNA3D finite element dynamic code was then utilized to analyze the flexure quasi-static and dynamic responses. Analysis results indicate that the peak dynamic stress in the flexure is 28% higher than the quasi-static response. Therefore, it is recommended that dynamic stress be considered in flexure fatigue life prediction.

Keywords

Fatigue Life Prediction Static Deflection Flexure Finger Dynamic Deflection Maximum Effective Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Johnson, A. L., “Spacecraft Borne Long Life Cryogenic Refrigeration Status and Trends,” Cryogenics, pp. 339-347, July 1983.Google Scholar
  2. 2.
    Henderson, B. W., “U. S. Industry Close to Producing Long-Life Space Cooling System,” Aviation Week & Space Technology. 6 April 1992.Google Scholar
  3. 3.
    Wong, T. E., Pan, R. B., and Johnson, A. L., “Novel Linear Flexure Bearing,” 7th International Cryocooler Conference. 17–19 November 1992, Santa Fe, NM, pp. 675-698.Google Scholar
  4. 4.
    Whirley, R. G. and Engelmann, B. E., DYNA3D User Manual. Lawrence Livermore National Laboratory, UCRL-MA-107254 Rev. 1, November 1993.Google Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • T. E. Wong
    • 1
  • R. B. Pan
    • 1
  • H. D. Marten
    • 1
  • C. Sve
    • 1
  • L. Galvan
    • 1
  • T. S. Wall
    • 1
  1. 1.The Aerospace CorporationEl SegundoUSA

Personalised recommendations