Abstract The importance of long term endurance evaluation data on cryocooler technology cannot be overemphasized. As useful and important as operational data is failure analysis data and the lessons learned from those failures. During fiscal year 1999, the TRW 3503 pulse tube and the Creare Single Stage Reverse Brayton (SSRB) stopped operating during endurance evaluation at the Air Force Research Laboratory (AFRL) Cryogenic Cooling Research Facility (CCRF). On 8–9 November 1998, the TRW 3503 pulse tube cryocooler suffered a system overheat as a result of an environmental control electronics failure. The cooler kept operating throughout the overheat and continued to run after the environmental system was stabilized. The TRW 3503 continued to run with only a small performance degradation of approximately +2K over the design point with a heat load of 0.3W until it tripped and shut down on 20 April 1999. The cooler would not restart, so AFRL engineers and technicians worked with TRW to investigate the cause of the tripping. On 19 December 1998, the Creare SSRB shut down due to an enviromental system fail-safe overheat condition on the compressor. Subsequent attempts to restart the cooler were unsuccessful. The compressor started normally, but the free spinning turboexpander (TE) was not able to lift off of its bearings and start spinning. AFRL personnel worked with Creare to investigate the cause of the TE’s inability to lift up and spin. This paper will discuss the investigation of both cryocoolers’ inability to restart, initial observations in post-endurance disassembly, and lessons learned from these experiences.


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    Title :

    Initial Observations from the Disassembly and Inspection of the TRW 3503 and Creare SSRB


    Contributors:

    Published in:

    Publication date :

    2002-01-01


    Size :

    7 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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