Browsing by Author "Morris, Danielle"

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Establishing a Standardized Test Method for Evaluating the Cut Resistance of Space Suit Glove Fabrics
(2024 International Conference on Environmnetal Systems, 2024-07-21) Jones, Robert J.; Abney,Morgan B.; Brady, Tim; Morris, Danielle; Rhodes, Richard; McFarland, Shane; Cox, Andrew; Settles, Joe; Funk, Andrew
The Artemis space suit glove environmental protection garment (EPG) will be the first line of protection used to shield the crewmember's hands from the environments encountered during extravehicular activity (EVA). As the Artemis missions will include more extreme environments than those experienced on the International Space Station, development, verification, and validation of gloves poses three key challenges. First, there are no standardized tests defined to evaluate the durability of space suit gloves for the extreme lunar environments, particularly against the continual threat of inadvertently cutting the fabric of the glove. Second, there is insufficient data on state-of-the-art glove cut performance at lunar temperatures from which to compare new designs. Third, current ISS glove Thermal Micrometeoroid Garment (TMG) fabrics are unlikely to be sufficient to meet Lunar requirements. It is therefore necessary to define tests to evaluate if glove fabrics can meet new, challenging cut requirements. This paper focuses on the development of a test procedure to characterize the cut resistance of lunar EVA glove fabrics at cryogenic temperatures using a modified ASTM standardized test method. The results of testing on Phase VI glove fabrics are presented.
Upgrades to the International Space Station Urine Processor Assembly
(2020 International Conference on Environmental Systems, 2020-07-31) Williamson, Jill; Carter, Layne; Morris, Danielle; Hill, Jimmy; Caviglia, Colton
The ISS Urine Processor Assembly (UPA) began operations in November 2008. Though the UPA has successfully generated distillate from crew urine, several modifications and upgrades have been implemented to improve overall system performance throughout the years. Current and future upgrades to the UPA will continue to focus on improved system performance and reliability, focusing next on a flight demonstration experiment of a vacuum pump utilizing scroll pump technologies. The upgraded Distillation Assembly (DA), described in further detail in previous publications, will also be available for on-orbit integration within the year. The following paper discusses progress on the Purge Pump and Separator Assembly (PPSA) and concept considerations for future UPA upgrades.
Upgrades to the International Space Station Urine Processor Assembly
(49th International Conference on Environmental Systems, 2019-07-07) Williamson, Jill; Carter, Layne; Hill, Jimmy; Graves, Rex; Jones, Davey; Morris, Danielle
The ISS Urine Processor Assembly (UPA) began operations in November 2008. Though the UPA has successfully generated distillate from crew urine, several modifications and upgrades have been implemented to improve overall system performance throughout the years. Current and future upgrades to the UPA will continue to focus on improved system performance and reliability, focusing primarily on the Distillation Assembly and upgrades to the UPA vacuum pump. Work towards a flight demonstration experiment of a vacuum pump utilizing scroll pump technologies has also continued forward. The following paper discusses progress on these various concepts, including the implementation of a more reliable drive belt, improved methods for managing condensate in the stationary bowl of the Distillation Assembly, installation of improved centrifuge bearings, implementation of a liquid level sensor, and upgrades to the UPA vacuum pump.
Validation Testing and Statistical Analysis of the Rotary Tumbler Fabric Abrasion Method
(2024 International Conference on Environmnetal Systems, 2024-07-21) Jones, Robert J.; Abney,Morgan B.; Brady, Tim; Morris, Danielle; Wilson,Sara; Rhodes, Richard; McFarland, Shane; Funk, Andrew; Deaton, Anthoney Shawn
The Artemis space suit glove environmental protection garment (EPG) will be the first line of protection used to shield the crewmember's hands from the environments encountered during extravehicular activity (EVA). As the Artemis missions will include more extreme environments than those experienced on the International Space Station, development, verification, and validation of gloves requires the development of new test methods. A previous paper focused on the development of a test procedure to characterize lunar EVA glove fabrics using ASTM standardized test methods and the design and validation of a new standardized test procedure for comparing abrasion resistance between fabrics using a dust and rock filled rotary tumbler. Preliminary results of testing were presented in the last paper. This paper reports on the validation testing and statistical analysis of the newly developed tumbler abrasion test method.
Wire-break Ignition Testing of Materials for Spacesuit Fire Hazard Control
(2024 International Conference on Environmnetal Systems, 2024-07-21) Campbell, Colin; Peralta, Stephen; Ward, Virginia; Abney, Morgan; Morris, Danielle; Gallus, Tim
The input design constraints applied to the Extra-Vehicular Activity (EVA) spacesuit pose a significant challenge for mitigation of the fire hazard. In order to minimize fatigue and increase comfort of the crewmember operating the suit, the suit pressure is lowered below sea level conditions with typical EVA suit designs operating with 4.3 psia (29.7 kPa). With the lowered operating pressures and the use of closed loop life support, the suit requires elevated concentrations of oxygen typically >95%. At these oxygen concentrations, nearly the entirety of the suit internal materials are flammable. This leaves one remaining possible control leg of the fire triangle: ignition sources. Since the Gemini and Apollo programs, this has been a risk that has under constant reassessment with focus on improved mitigation. After the Apollo I fire, an arc ignition method was developed and used to quantify ignition thresholds for in-suit materials resulting in a current limit for powered in-suit devices applied to all suit designs that followed. After the discovery of a frayed spacesuit biomed cable on STS-113 during the Shuttle Program, the previous arcing method was repeated with additional methods developed to extend the testing further. One of those methods was Wire-break Ignition Testing in which the current in a single strand of wire was progressively taken higher preheating the material in proximity with a resultant break and the application of a reasonably repeatable arc to ignite the material all while exposed in the selected environment. This method was used to test a suite of spacesuit materials providing relative performance with respect to ignition with this particular configuration for application of energy. Leveraging the previous data and extending it further to consider more and recent materials coupled with lowering energy levels via smaller wire gauges is the subject of this paper.