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A computer simulation model is a valuable tool in the evaluation of a developing hardware program and as a diagnostic/simulation aid for an ongoing production system. Hamilton Standard has developed a G189A simulation model to investigate the performance of a Space Station Extravehicular Mobility Unit (SSEMU). The SSEMU, also known as the Advanced Extravehicular Mobility Unit (AEMU), is in a hardware selection phase and further studies are beneficial to evaluate system performance using various subsystem candidates and integration schemes. Several subroutines representing newly developed subsystems have been Incorporated Into G189A for use in this model. These subroutines are: a Thermoelectric Condensing Heat Exchanger, a Regenerable Non-venting Thermal Sink, a Metal Oxide CO2 Removal/Dehumidification Subsystem, and the air Interactions In the suit volume.

A computer simulation tool is written to investigate simulation and control of a Space Station air revitalization system. Candidate subsystems for various air revitalization roles in the Space Station have been and continue to be tested. However, integration and control of these subsystems into an effective system which revitalizes the air in all habitable areas needs to be evaluated. From such an evaluation, the size of subsystems, size and location of accumulators, and decisions on bussing of carbon dioxide, hydrogen, oxygen, and nitrogen can be affected. In addition, various control approaches can be assessed. The computer simulation model is described and its applications are presented.

A concept for the software tools needed to support the Space Station engineering process has evolved over the past two years. The approach is called the Emulation, Simulation, Sizing, and Technology Assessment Program. The software tools outlined in the approach are expected to benefit a developing hardware program. To demonstrate the utility of one of the software tools recommended in this approach, Hamilton Standard, under contract with the NASA Langley Research Center, has been developing an emulation and simulation computer model for the Space Station air revitalization system. The paper begins with a brief description of the modeled Space Station air revitalization system and its operation. The paper continues with a description of the computer model and its validation, and concludes with a discussion of the benefits and experiences of using the computer model to support such areas as hardware design, test planning, and control development.