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  • 1
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    Aircraft engineering and aerospace technology 74 (2002), S. 442-446 
    ISSN: 0002-2667
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The use of computer simulation helped to significantly reduce the estimated costs of building the International Space Station's (ISS) X-38 emergency crew return vehicle. Lockheed Martin engineers wanted to determine the actual flow conditions within the X-38 cabin, but ruled out physical testing as they lacked a physical prototype of the X-38 and because such testing could prove very difficult. Computational Fluid Dynamics (CFD) simulation offered an alternative way to evaluate airflow within the vehicle by making it possible to visualize the flow field. Engineers built a computer model of the X-38 and its contents, and used CFD to simulate the airflow and heat transfer throughout the vehicle's cabin, thus eliminating the costs of building and testing a physical prototype.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: Engineers at Johnson Space Center (JSC) are developing an Environmental Control and Life Support System (ECLSS) design for the Multi-Mission Space Exploration Vehicle (MMSEV). The purpose of the MMSEV is to extend the human exploration envelope for Lunar, Near Earth Object (NEO), or Deep Space missions by using pressurized exploration vehicles. The MMSEV, formerly known as the Space Exploration Vehicle (SEV), employs ground prototype hardware for various systems and tests it in manned and unmanned configurations. Eventually, the system hardware will evolve and become part of a flight vehicle capable of supporting different design reference missions. This paper will discuss the latest MMSEV ECLSS architectures developed for a variety of design reference missions, any work contributed toward the development of the ECLSS design, lessons learned from testing prototype hardware, and the plan to advance the ECLSS toward a flight design.
    Keywords: Man/System Technology and Life Support
    Type: JSC-CN-28390 , 2013 International Conference of Environmental Systems (ICES); Jul 14, 2013 - Jul 18, 2013; Vail, CO; United States
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-19
    Description: Under NASA's ORION Multi-Purpose Crew Vehicle (MPCV) Environmental Control and Life Support System (ECLSS) Project at Johnson Space Center's (JSC), the Crew and Thermal Systems Division has developed performance models of the air system using Thermal Desktop/FloCAD. The Thermal Desktop model includes an Air Revitalization System (ARS Loop), a Suit Loop, a Cabin Loop, and Pressure Control System (PCS) for supplying make-up gas (N2 and O2) to the Cabin and Suit Loop. The ARS and PCS are designed to maintain air quality at acceptable O2, CO2 and humidity levels as well as internal pressures in the vehicle Cabin and during suited operations. This effort required development of a suite of Thermal Desktop Orion ECLSS models to address the need for various simulation capabilities regarding ECLSS performance. An initial highly detailed model of the ARS Loop was developed in order to simulate rapid pressure transients (water hammer effects) within the ARS Loop caused by events such as cycling of the Pressurized Swing Adsorption (PSA) Beds and required high temporal resolution (small time steps) in the model during simulation. A second ECLSS model was developed to simulate events which occur over longer periods of time (over 30 minutes) where O2, CO2 and humidity levels, as well as internal pressures needed to be monitored in the cabin and for suited operations. Stand-alone models of the PCS and the Negative Pressure relief Valve (NPRV) were developed to study thermal effects within the PCS during emergency scenarios (Cabin Leak) and cabin pressurization during vehicle re-entry into Earth's atmosphere. Results from the Orion ECLSS models were used during Orion Delta-PDR (July, 2014) to address Key Design Requirements (KDR's) for Suit Loop operations for multiple mission scenarios.
    Keywords: Man/System Technology and Life Support
    Type: JSC-CN-32350 , International Conference on Environmental Systems (ICES 2015); Jul 12, 2015 - Jul 16, 2015; Bellevue, WA; United States
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