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The Dynamic Environment Simulator (DES), a man-rated centrifuge, was used to support testing of the Integrated, Closed Environmental Control System (ICECS). DES drive and support systems were modified to satisfy ICECS power, cooling and control requirements. Digital control of the DES drive systems allowed ICECS exposure to acceleration magnitudes approaching 10 G for extended periods. During latter phases of testing, G profiles were customized as indicated by the results to completely determine ICECS system dynamics. The DES provided a flexible, low cost test bed with all test objectives satisfied on time and on budget.

Vapor cycle environmental control systems are being designed for efficient electronic cooling on advanced fighter aircraft. A vapor cycle system, employing a two-phase refrigerant, must be able to operate in a variety of attitudes in a variable-gravity flight environment. In order to verify operation of an agile aircraft's vapor cycle system prior to flight test, the Air Force is upgrading the Armstrong Laboratory's Dynamic Environment Simulator centrifuge. This paper will discuss the facility, the types of testing that will be used to simulate flight loads, and the design of vapor cycle components which will allow them to operate in a variable-G environment.