Volume 34 Issue 2
Feb.  2019
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Design method of large dimension cold shield based on G-M cryocooler[J]. Journal of Aerospace Power, 2019, 34(2): 341-347. doi: 10.13224/j.cnki.jasp.2019.02.010
Citation: Design method of large dimension cold shield based on G-M cryocooler[J]. Journal of Aerospace Power, 2019, 34(2): 341-347. doi: 10.13224/j.cnki.jasp.2019.02.010
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Design method of large dimension cold shield based on G-M cryocooler

doi: 10.13224/j.cnki.jasp.2019.02.010

  • Received Date: 2018-04-12
  • Publish Date: 2019-02-28
    Abstract
  • The design methods of the 20K large dimension cold shield based on Gifford-Mcmahon (G-M) cryocoolers used for infrared calibration test in space environment simulation test were introduced. The cold shield with 1m×1m boundary condition, the largest dimension in China, was cooled by five G-M cryocoolers. The installation and distribution of cold shield were introduced, and the method of compensator for contraction on cooling was also described in detail. The temperature distribution and cool-down time of cold shield surface were calculated and analyzed. The design of cold shield resolved the difficulty of compensator for contraction on cooling successfully. Test results showed that the temperature on the cold shield was 15K, and the temperature uniformity was ±1K. This indicated that the actual technical performance of the cold shield met and even exceeded the design requirements.

     

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