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  • 1
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    Tools and technologies needed for conducting planetary field geology while on EVA: Insights from the 2010 Desert RATS geologist crewmembers (2013)
    Elsevier
    Details
    Publication Date: 2013-10-01
    Print ISSN: 0094-5765
    Electronic ISSN: 1879-2030
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Asteroid Redirect Crewed Mission Space Suit and EVA System Maturation (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Asteroid Redirect Crewed Mission (ARCM) requires a Launch/Entry/Abort (LEA) suit capability and short duration Extra Vehicular Activity (EVA) capability from the Orion spacecraft. For this mission, the pressure garment selected for both functions is the Modified Advanced Crew Escape Suit (MACES) with EVA enhancements and the life support option that was selected is the Exploration Portable Life Support System (PLSS) currently under development for Advanced Exploration Systems (AES). The proposed architecture meets the ARCM constraints, but much more work is required to determine the details of the suit upgrades, the integration with the PLSS, and the tools and equipment necessary to accomplish the mission. This work has continued over the last year to better define the operations and hardware maturation of these systems. EVA simulations were completed in the Neutral Buoyancy Lab (NBL) and interfacing options were prototyped and analyzed with testing planned for late 2014. This paper discusses the work done over the last year on the MACES enhancements, the use of tools while using the suit, and the integration of the PLSS with the MACES.
    Keywords: Man/System Technology and Life Support
    Type: JSC-CN-32259 , IEEE Aerospace Conference; Mar 07, 2015 - Mar 14, 2015; Big Sky, MT; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Analytical and Experimental Studies of Leak Location and Environment Characterization for the International Space Station (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The International Space Station program is developing a robotically-operated leak locator tool to be used externally. The tool would consist of a Residual Gas Analyzer for partial pressure measurements and a full range pressure gauge for total pressure measurements. The primary application is to detect NH3 coolant leaks in the ISS thermal control system.An analytical model of leak plume physics is presented that can account for effusive flow as well as plumes produced by sonic orifices and thruster operations. This model is used along with knowledge of typical RGA and full range gauge performance to analyze the expected instrument sensitivity to ISS leaks of various sizes and relative locations (directionality).The paper also presents experimental results of leak simulation testing in a large thermal vacuum chamber at NASA Goddard Space Flight Center. This test characterized instrument sensitivity as a function of leak rates ranging from 1 lbmyr. to about 1 lbmday. This data may represent the first measurements collected by an RGA or ion gauge system monitoring off-axis point sources as a function of location and orientation. Test results are compared to the analytical model and used to propose strategies for on-orbit leak location and environment characterization using the proposed instrument while taking into account local ISS conditions and the effects of ramwake flows and structural shadowing within low Earth orbit.
    Keywords: Spacecraft Design, Testing and Performance
    Type: GSFC-E-DAA-TN15807 , International Symposium on Rarefied Gas Dynamics; Jul 13, 2014 - Jul 18, 2014; Xian; China
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A Geology Sampling System for Small Bodies (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Human exploration of microgravity bodies is being investigated as a precursor to a Mars surface mission. Asteroids, comets, dwarf planets, and the moons of Mars all fall into this microgravity category and some are being discussed as potential mission targets. Obtaining geological samples for return to Earth will be a major objective for any mission to a small body. Currently, the knowledge base for geology sampling in microgravity is in its infancy. Humans interacting with non-engineered surfaces in microgravity environment pose unique challenges. In preparation for such missions a team at the NASA Johnson Space Center has been working to gain experience on how to safely obtain numerous sample types in such an environment. This paper describes the type of samples the science community is interested in, highlights notable prototype work, and discusses an integrated geology sampling solution.
    Keywords: Lunar and Planetary Science and Exploration
    Type: ICES-2016-381 , JSC-CN-35582 , ICES 2016: International Conference on Environmental Systems; Jul 10, 2016 - Jul 14, 2016; Vienna; Austria
    Format: application/pdf
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  • 5
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    The Demonstration of a Robotic External Leak Locator for the International Space Station (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The International Space Station (ISS) and all currently conceivable future manned spacecraft are susceptible to mission impacts due to fluid/gas leaks to the exterior environment. For example, there is a well-known risk of ammonia leaks from the ISS External Active Thermal Control System (EATCS) loops and as of 2016 there was no method to locate them. It was, therefore, critical to develop a method for detecting and locating leaks to preserve vehicle health. The Robotic External Leak Locator (RELL) was developed and deployed to the ISS to provide this capability. An on-orbit validation and demonstration was successfully completed in December 2016 and leak locating operations occurred in February 2017. This paper discusses the results of these exercises including measurements of the environment around ISS, detection of a small ammonia leak and implementation of leak locating methodologies. RELL is a collaboration between NASA's Goddard Space Flight Center (GSFC) and Johnson Space Center (JSC) and was launched to the ISS as a Technology Demonstration Payload in December 2015 on Orbital-ATK Commercial Resupply Flight 4.
    Keywords: Space Transportation and Safety; Spacecraft Instrumentation and Astrionics
    Type: JSC-E-DAA-TN60198 , AIAA Space Forum 2018; Sep 17, 2018 - Sep 19, 2018; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    EVA Technology Workshop: xEMU Demo Status (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-03
    Description: This presentation provides a status of the xEMU ISS Demo project and the approach to requirements definition related to certification and extensibility considerations.
    Keywords: Man/System Technology and Life Support
    Type: JSC-E-DAA-TN70834 , 2019 EVA Workshop; Jul 25, 2019; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Collaborative Forum 2: Paving a Path to an EVA Suit Standard (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-02
    Description: This presentation supports a Collaborative Discussion regarding industry's utilization of other NASA or external design standards and feedback and recommendations to support the possibility of an EVA suit standard.
    Keywords: Man/System Technology and Life Support
    Type: JSC-E-DAA-TN70883 , EVA Exploration Workshop; Jul 25, 2019; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Tools and Technologies Needed for Conducting Planetary Field Geology While On EVA: Insights from the 2010 Desert RATS Geologist Crewmembers (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Observation is the primary role of all field geologists, and geologic observations put into an evolving conceptual context will be the most important data stream that will be relayed to Earth during a planetary exploration mission. Sample collection is also an important planetary field activity, and its success is closely tied to the quality of contextual observations. To test protocols for doing effective planetary geologic fieldwork, the Desert RATS (Research and Technology Studies) project deployed two prototype rovers for two weeks of simulated exploratory traverses in the San Francisco volcanic field of northern Arizona. The authors of this paper represent the geologist crewmembers who participated in the 2010 field test. We document the procedures adopted for Desert RATS 2010 and report on our experiences regarding these protocols. Careful consideration must be made of various issues that impact the interplay between field geologic observations and sample collection, including time management; strategies related to duplication of samples and observations; logistical constraints on the volume and mass of samples and the volume/transfer of data collected; and paradigms for evaluation of mission success. We find that the 2010 field protocols brought to light important aspects of each of these issues, and we recommend best practices and modifications to training and operational protocols to address them. Underlying our recommendations is the recognition that the capacity of the crew to "flexibly execute" their activities is paramount. Careful design of mission parameters, especially field geologic protocols, is critical for enabling the crews to successfully meet their science objectives.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC.JA.00102.2012
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    EVA Exploration Virtual Collaboration Meeting - 2018 (2018)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: No abstract available
    Keywords: General
    Type: JSC-E-DAA-TN59262 , Exploration Extravehicular Activity (EVA) Virtual Collaboration Meeting; Aug 16, 2018; Houston, TX; United States
    Format: application/pdf
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  • 10
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    Analytical and Experimental Studies of Leak Location and Environment Characterization for the International Space Station (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The International Space Station program is developing a robotically-operated leak locator tool to be used externally. The tool would consist of a Residual Gas Analyzer for partial pressure measurements and a full range pressure gauge for total pressure measurements. The primary application is to detect NH3 coolant leaks in the ISS thermal control system. An analytical model of leak plume physics is presented that can account for effusive flow as well as plumes produced by sonic orifices and thruster operations. This model is used along with knowledge of typical RGA and full range gauge performance to analyze the expected instrument sensitivity to ISS leaks of various sizes and relative locations ("directionality"). The paper also presents experimental results of leak simulation testing in a large thermal vacuum chamber at NASA Goddard Space Flight Center. This test characterized instrument sensitivity as a function of leak rates ranging from 1 lb-mass/yr. to about 1 lb-mass/day. This data may represent the first measurements collected by an RGA or ion gauge system monitoring off-axis point sources as a function of location and orientation. Test results are compared to the analytical model and used to propose strategies for on-orbit leak location and environment characterization using the proposed instrument while taking into account local ISS conditions and the effects of ram/wake flows and structural shadowing within low Earth orbit.
    Keywords: Cybernetics, Artificial Intelligence and Robotics; Spacecraft Instrumentation and Astrionics; Spacecraft Design, Testing and Performance
    Type: GSFC-E-DAA-TN15645 , International Symposium on Rarefied Gas Dynamics; Jul 13, 2014 - Jul 18, 2014; Xian; China
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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