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dc.creatorBartlett, Harrison
dc.creatorBowser, Joe
dc.creatorCallejon-Hierro, Carlos
dc.creatorGarner, Sarah
dc.creatorGuloy, Lawrence
dc.creatorHnatov, Christina
dc.creatorKalman, Jonathan
dc.creatorSosis, Baram
dc.creatorAkin, David
dc.date.accessioned2019-06-20T18:12:25Z
dc.date.available2019-06-20T18:12:25Z
dc.date.issued2019-07-07
dc.identifier.otherICES_2019_277
dc.identifier.urihttps://hdl.handle.net/2346/84485
dc.descriptionHarrison Bartlett, University of Maryland (UMD), USA
dc.descriptionJoe Bowser, University of Maryland (UMD), USA
dc.descriptionCarlos Callejon-Hierro, University of Maryland (UMD), USA
dc.descriptionSarah Garner, University of Maryland (UMD), USA
dc.descriptionLawrence Guloy, University of Maryland (UMD), USA
dc.descriptionChristina Hnatov, University of Maryland (UMD), USA
dc.descriptionJonathan Kalman, University of Maryland (UMD), USA
dc.descriptionBaram Sosis, University of Maryland (UMD), USA
dc.descriptionDavid Akin, University of Maryland (UMD), USA
dc.descriptionICES400: Extravehicular Activity: Space Suits
dc.descriptionThe 49th International Conference on Environmental Systems was held in Boston, Massachusetts, USA on 07 July 2019 through 11 July 2019.
dc.description.abstractOver the past several years, the University of Maryland has been developing technologies for in-situ additive manufacturing of spacesuits based on AX-5-type hard suits. Past work covered technologies tested for fabrication of pressure-tight structures, and focused heavily on 3D-printed bearings and seals. This paper summarizes the culmination of this first phase of the program, leading to the mechanical and human operations testing of a spacesuit elbow assembly made almost entirely using additive manufacturing. The final module is fabricated using selective laser sintering, except for the spherical balls in the bearings and metal rings to provide low-friction rotary sealing surfaces. Seals tested include both commercial off-the-shelf rotary seals and 3D-printed seals using a Polyjet process with variable material properties to optimize seal functionality. The elbow module is a four-bearing, three-wedge assembly attached to a sealing ring at the proximal end for installation in the UMd partial pressure glove box, and to a sizing insert and standard EMU wrist disconnect to attach to a spacesuit glove. Tests performed include external actuation of the elbow joint with and without pressure to measure bending loads and hysteresis, and use by human test subjects inside a glove box depressurized to 4.3 psid. A Fitts’ Tapping test board was developed and integrated into the glove box to provide a quantitative measure of arm mobility, in conjunction with NASA Task Load Index (TLX) assessments from the test subjects. All tests were also performed with a standard EMU arm as a control. Results of the testing are presented and analyzed; the paper concludes with an assessment of the potential of this technology to scale up to a full pressure suit, and design concepts for future testing and eventual operational applications.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisher49th International Conference on Environmental Systems
dc.subjectSpacesuits
dc.subjectHard suits
dc.subjectAX-5
dc.subjectAdditive manufacturing
dc.subjectGlovebox testing
dc.subjectRotary seals
dc.subjectBearings
dc.titleDevelopment and Testing of a 3D-Printed Spacesuit Elbow Assemblyen_US
dc.typePresentations


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