Accession Number : ADA315062

Title :   International Space Station Passive and Active Common Berthing Mechanism Thermal Cycle Test.

Descriptive Note : Final rept. Aug 95-Apr 96,

Corporate Author : ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN

Personal Author(s) : Sisco, J. D. ; Rogers, L. G. ; Wilkerson, J. S. ; Burt, W. G.

PDF Url : ADA315062

Report Date : SEP 1996

Pagination or Media Count : 57

Abstract : The International Space Station Alpha Common Berthing Mechanism (CBM) thermal cycle test was conducted in the Arnold Engineering Development Center (AEDC) 12V Thermal Vacuum Chamber. The CBM is the primary mechanical interface for joining the International Space Station Alpha modules on-orbit. The CBM system consists of a pair of 6-ft-diam rings with the appropriate means to seal the joint upon mating. The first ring, called Active CBM (ACBM), houses the powered bolts which drive the two halves together. The second ring, called Passive CBM (PCBM), contains the seals which are energized when the two halves are mated. Each CMB is attached to its respective module with a sealed flange on a berthing plate. Both CBMs are in the developmental testing stage. AEDC's 12V Thermal Vacuum Chamber exposed the test hardware to the deep space thermal environment with the use of the 12V's Xenon solar simulator and internal liquid nitrogen (LN2) cold wall liner. The primary objective of this test project is to thermal cycle the passive Common Berthing Mechanism developed under the NASA-MSFC/Boeing International Space Station Alpha program. Performance parameters validated by tests include: thermal model validation, test article temperature, gross heat flux evaluation, and seal integrity survivability. The 68-day test matrix included 54 hot and cold thermal cycles consisting of six different hardware configurations, each requiring separate pumpdowns. The chamber performance for this project included a vacuum of less than 1 x 10E-5 torr and a background temperature of less than -250 deg F.

Descriptors :   *SPACE STATIONS, *THERMAL CYCLING TESTS, TEST AND EVALUATION, THERMAL PROPERTIES, TEMPERATURE, LOW TEMPERATURE, MECHANICAL PROPERTIES, ENVIRONMENTS, SURVIVABILITY, VALIDATION, MODELS, INTERFACES, PARAMETERS, VACUUM, TEST EQUIPMENT, LININGS, INTERNAL, CONFIGURATIONS, FLANGES, DATA ACQUISITION, WALLS, BACKGROUND, LIQUID NITROGEN, RINGS, HEAT, HEAT FLUX, DEEP SPACE, CHAMBERS, SEALS(STOPPERS), SEALED SYSTEMS, CYCLIC TESTS.

Subject Categories : Thermodynamics
      Ground Support Sys & Facil For Space Vehicles

Distribution Statement : APPROVED FOR PUBLIC RELEASE