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Vacuum Line Design and Analysis for the Space Station Freedom Airlock Depressurization/Repressurization Subsystem
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English
Abstract
The Space Station Freedom (SSF) airlock Depressurization/Repressurization (D/R) subsystem designed by McDonnell Douglas Aerospace Space Station Division is used to depressurize the airlock to allow egress from SSF by two pressure suited crewmembers to perform extravehicular activity (EVA), and to repressurize the airlock at the conclusion of EVA. The D/R subsystem utilizes vacuum, or D/R Equalization (D/RE), lines to accomplish the functions of venting airlock gas to space during depressurization and equalizing pressures between airlock and SSF chambers during repressurization. Categories of D/RE line requirements include performance; safety, reliability, and maintainability; and control and operations. For the development of the SSF airlock, McDonnell Douglas Aerospace has performed analysis and developed design solutions that meet these requirements while optimizing performance and cost. This paper will describe results of this analysis, including system performance data.
Authors
Citation
James, D., "Vacuum Line Design and Analysis for the Space Station Freedom Airlock Depressurization/Repressurization Subsystem," SAE Technical Paper 932221, 1993, https://doi.org/10.4271/932221.Also In
References
- James D.G. Space Station Freedom Airlock Depress/Repress System Design and Performance SAE 921378 22nd International Conference on Environmental Systems July 1992
- Space Station Projects Description and Requirements Document JSC 31000 3 Rev. H
- Extravehicular Activity System Architectural Control Document SSP 30256, Rev. D6 December 1992
- Equalize FORTRAN program developed by Paul Paris-Coker, MDSSC Airlock Outfitting Design Group January 1991
- Ayotte A.R. A Computer Model To Simulate Depressurization of Space Station Freedom's Airlock Vent-Down System MDC No. H6854 MDSSC Plume Effects & Contamination Design and Technology Center August 1991
- NASA/FLAGRO Fatigue Crack Growth Computer Program NASA-JSC
- Kim S. MB-7 Airlock Depress/Repress Functional Flow McDonnell Douglas Aerospace Systems Engineering & Integration 22 April 1992
- Space Station Freedom Man-Systems Integration Standards NASA-STD-3000 IV October 1986