Abstract
Cryocooler thermal and vibrational performance is determined, fundamentally, by the dynamic interactions between the mechanical system and the working fluid. This paper explores the effect of working-fluid characteristics on the mechanical response of the cooler. Experimental data collected from two coolers characterized under the Jet Propulsion Laboratory’s extensive program of cryocooler testing and characterization show that a classical single-degree-of- freedom spring-mass-damper model does not capture the full frequency dependence of the mechanical response. The data from two modes of cooler operation (slosh and head-to-head) are used to motivate the explanation that working-fluid characteristics dominate at high frequencies, and mechanical system characteristics dominate at lower frequencies. Operating temperature is shown to be a significant factor in determining resonance behavior. Finally, the discussion provides a framework within which resonant parameters and cooler characteristics can extracted from the experimental data.
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References
Ross, R.G. Jr., “Requirements for Long-life Mechanical Cryocoolers for Space Applications”, Cryogenics, vol. 30, (1990), pp. 233–238.
Ross, R.G. Jr, et al., “Cryocooler Resonance Characterization”, Cryogenics, vol. 34, no. 5 (1994), pp. 435–442.
Thomson, W.T., Theory of Vibration with Applications, 3rd ed., Prentice Hall, Englewood Cliffs, New Jersey, (1988), pp.50–81.
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© 1997 Springer Science+Business Media New York
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Heun, M.K., Collins, S.A., Johnson, D.L., Ross, R.G. (1997). Investigation of Gas Effects on Cryocooler Resonance Characteristics. In: Ross, R.G. (eds) Cryocoolers 9. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5869-9_49
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DOI: https://doi.org/10.1007/978-1-4615-5869-9_49
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-7691-0
Online ISBN: 978-1-4615-5869-9
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