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Cryocoolers 8 pp 437-448 | Cite as

Active Multi-Axis Vibration Cancellation for Split-Stirling Cryocoolers

  • S. A. Collins
  • J. D. Paduano
  • A. H. von Flotow

Abstract

Many proposed spacecraft-borne instruments rely on miniature Stirling cryocoolers for focal plane cooling; a significant drawback of these coolers is the vibration induced by the reciprocating motion of the cooler’s internal components. This paper describes an active vibration cancellation system for the expander of a Hughes split-Stirling cryocooler. A multi-axis electrodynamic actuator counters the axial force and two lateral torques generated by the cooler. The actuator is driven by a frequency-tracking narrowband controller to null error signals obtained from load cells. The controller is composed of a parallel arrangement of analog modules to handle multiple harmonics. In a single-axis cancellation test, the cross-axis coupling of the actuator is found to be significant compared to the multi-axis content of the cooler vibration. However, this coupling is shown to have little effect on a multi-axis cancellation system.

Keywords

Axial Force Reference Signal Adaptive Filter Loop Transfer Function Multiple Harmonic 
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.

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References

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    B. Widrow and S. D. Stearns, Adaptive Signal Processing, Prentice-Hall, Inc., Englewood Cliffs, NJ (1985).MATHGoogle Scholar
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    R. Boyle, F. Connors, J. Marketon, V. Arillo, E. James, and R. Fink, “Non-Real Time, Feed Forward Vibration Control System Development & Test Results,” 7th International Cryocooler Conference, PL-CP-93-1001, pp. 805-819.Google Scholar
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    R. J. Glaser, R.G. Ross, Jr., and D. L. Johnson, “Cryocooler Tip Motion Suppression Using Active Control of Piezoelectric Actuators,” 7th International Cryocooler Conference, PL-CP-93-1001, pp. 1086-1097.Google Scholar
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    Y.-W. A. Wu, “Active Vibration Control Algorithm for Cryocooler Systems,” presented at the Cryogenic Engineering Conference, Albuquerque, NM, July 12–16, 1993.Google Scholar
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    S. A. Collins, J. D. Paduano, and A. H. von Flotow, “Multi-Axis Vibration Cancellation for Stirling Cryocoolers,” presented at Cryogenic Optical Systems and Instruments VI, Orlando, FL, April 4–5, 1994, SPIE Paper No. 2227-18.Google Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • S. A. Collins
    • 1
  • J. D. Paduano
    • 1
  • A. H. von Flotow
    • 2
  1. 1.Massachusetts Institute of TechnologyCambridgeUSA
  2. 2.Hood Technology CorporationHood RiverUSA

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