Vibration reduction in a set-up of two split type stirling cryocoolers

A.P. Rijpma, J.F.C. Verberne, E.H.R. Witbreuk, H.J.M. ter Brake

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    At the University of Twente research is in progress on performing magnetocardiography in clinical conditions. For the magnetic measurements High-Tc SQUIDs will be used, which will be cooled by commercial cryocoolers. These coolers consist of separate compressor and displacer modules. The compressors are of the dual opposed pistons type. Since the magnetic measurements are sensitive for movements of magnetic materials as well as for movements of the sensors, it is advantageous to minimise the vibrations caused by the cryocoolers. This is achieved by:
    Using coolers with dual opposed pistons in the compressor modules.

    Using two coolers and combining the two displacer modules into one rigid unit and operating them in a dual opposed manner.

    The remaining vibrations in the axial direction are about 1 ms−2 for the compressors and 0.2 ms−2 for the displacer unit. In order to reduce these vibrations, the automated control system described in this paper was developed. It uses an adaptive feed-forward algorithm based on the work of Wu1 and Boyle et al.2 and is capable of controlling the vibrations of the two compressors and the displacer unit for multiple harmonics simultaneously. Thus the vibration levels are reduced down to 0.02 ms−2 and 0.01 ms−2 for the compressors and the displacer unit respectively.
    Original languageEnglish
    Title of host publicationCryocoolers 9
    EditorsR.G. Ross Jr
    Place of PublicationBoston, MA
    PublisherSpringer
    Pages727-736
    Number of pages10
    ISBN (Electronic)978-1-4615-5869-9
    ISBN (Print)978-1-4613-7691-0
    DOIs
    Publication statusPublished - 15 Nov 1997
    Event9th International Cryocooler Conference, Cryocoolers-9 1996 - Waterville Valley, United States
    Duration: 25 Jun 199627 Jun 1996
    Conference number: 9

    Conference

    Conference9th International Cryocooler Conference, Cryocoolers-9 1996
    Abbreviated titleCryocoolers
    CountryUnited States
    CityWaterville Valley
    Period25/06/9627/06/96
    OtherJune 25-27, 1996

    Keywords

    • Control voltage
    • Automate control system
    • Control step
    • Drive voltage
    • Compressor module

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  • Cite this

    Rijpma, A. P., Verberne, J. F. C., Witbreuk, E. H. R., & ter Brake, H. J. M. (1997). Vibration reduction in a set-up of two split type stirling cryocoolers. In R. G. Ross Jr (Ed.), Cryocoolers 9 (pp. 727-736). Boston, MA: Springer. https://doi.org/10.1007/978-1-4615-5869-9_84