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  • 1
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    Inflight performance of the Ulysses reaction control system (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Ulysses spacecraft has been exploring the heliosphere since October 1990 in a six-year polar orbit. Despite varying operational demands, the pressure-fed monopropellant hydrazine reaction control system (RCS) has experienced few problems. The observed anomalies, having minimal operational impact, include plume impingement effects, electrical power overload effects and hydrazine gas generation effects. These anomalies are presented and discussed, with emphasis on the first observation of gas in the hydrazine propellant. The relatively low gas generation rate is attributed to: the use of high purity hydrazine; the configuration of the spin-stabilized spacecraft; the extensive use of titanium alloys; and the efficiency of the thermal control of the propellant tank which maintains a temperature of 21 C.
    Keywords: Spacecraft Propulsion and Power
    Type: ; 93-100
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Volatile Removal Assembly Flight Experiment and KC-135 Packed Bed Experiment: Results and Lessons Learned (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Volatile Removal Assembly (VRA) is a high temperature catalytic oxidation process that will be used as the final treatment for recycled water aboard the International Space Station (ISS). The multiphase nature of the process had raised concerns as to the performance of the VRA in a microgravity environment. To address these concerns, two experiments were designed. The VRA Flight Experiment (VRAFE) was designed to test a full size VRA under controlled conditions in microgravity aboard the SPACEHAB module and in a 1 -g environment and compare the performance results. The second experiment relied on visualization of two-phase flow through small column packed beds and was designed to fly aboard NASA's microgravity test bed plane (KC-135). The objective of the KC-135 experiment was to understand the two-phase fluid flow distribution in a packed bed in microgravity. On Space Transportation System (STS) flight 96 (May 1999), the VRA FE was successfully operated and in June 1999 the KC-135 packed bed testing was completed. This paper provides an overview of the experiments and a summary of the results and findings.
    Keywords: Man/System Technology and Life Support
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Space Station Water Processor Process Pump (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report presents the results of the development program conducted under contract NAS8-38250-12 related to the International Space Station (ISS) Water Processor (WP) Process Pump. The results of the Process Pumps evaluation conducted on this program indicates that further development is required in order to achieve the performance and life requirements for the ISSWP.
    Keywords: Mechanical Engineering
    Type: NASA-CR-199831 , NAS 1.26:199831
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Techniques for extreme attitude suspension of a wind tunnel model in a magnetic suspension and balance system (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Although small scale magnetic suspension and balance systems (MSBSs) for wind tunnel use have been in existence for many years, they have not found general application in the production testing of flight vehicles. One reason for this is thought to lie in the relatively limited range of attitudes over which a wind tunnel model may be suspended. Modifications to a small MSBS to permit the suspension and control of axisymmetric models over angles of attack from less than zero to over ninety degrees are reported. Previous work has shown that existing arrangement of ten electromagnets was unable to generate one of the force components needed for control at extreme attitudes. Examination of possible solutions resulted in a simple alteration to rectify this deficiency. To generate the feedback signals to control the suspended model, an optical position sensing system using collimated laser beams and photodiode arrays was installed and tested. An analytical basis was developed for distributing the demands for force and moment needed for model stabilization amonge the electromagnets over the full attitude range. This was implemented by an MSBS control program able to continually adjust the distribution for the instantaneous incidence in accordance with prescheduled data. Results presented demonstrate rotations of models from zero to ninety degrees at rates up to ninety degrees per second, with pitching rates rising to several hundred degrees per second in response to step-change demands. A study of a design for a large MSBS suggests that such a system could be given the capability to control a model in six degrees of freedom over an unlimited angle of attack range.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-181895 , NAS 1.26:181895
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    On-Orbit Measurement of Next Generation Space Solar Cell Technology on the International Space Station (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: On-orbit measurements of new photovoltaic (PV) technologies for space power are an essential step in the development and qualification of advanced solar cells. NASA Glenn Research Center will fly and measure several solar cells attached to NASA Goddards Robotic Refueling Mission (RRM), expected to be launched in 2014. Industry and government partners have provided advanced PV devices for evaluation of performance and environmental durability. The experiment is completely self-contained, providing its own power and internal data storage. Several new cell technologies including Inverted Metamorphic Multi-junction and four-junction cells will be tested.
    Keywords: Spacecraft Design, Testing and Performance; Electronics and Electrical Engineering
    Type: GRC-E-DAA-TN18687 , Space Photovoltaic Research and Technology Conference; Oct 28, 2014 - Oct 30, 2014; Cleveland, OH; United States
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    NASA TECHNICAL REPORTS
  • 6
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    On-Orbit Measurement of Next Generation Space Solar Cell Technology on the International Space Station (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Measurement is essential for the evaluation of new photovoltaic (PV) technology for space solar cells. NASA Glenn Research Center (GRC) is in the process of measuring several solar cells in a supplemental experiment on NASA Goddard Space Flight Center's (GSFC) Robotic Refueling Mission's (RRM) Task Board 4 (TB4). Four industry and government partners have provided advanced PV devices for measurement and orbital environment testing. The experiment will be on-orbit for approximately 18 months. It is completely self-contained and will provide its own power and internal data storage. Several new cell technologies including four- junction (4J) Inverted Metamorphic Multijunction (IMM) cells will be evaluated and the results compared to ground-based measurements.
    Keywords: Electronics and Electrical Engineering
    Type: AIAA Paper 2015-3898 , GRC-E-DAA-TN24836 , Propulsion and Energy Forum 2015; Jul 27, 2015 - Jul 29, 2015; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    High angle of attack position sensing for the Southampton University magnetic suspension and balance system (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An all digital five channel position detection system is to be installed in the Southampton University Magnetic Suspension and Balance System (SUMSBS). The system is intended to monitor a much larger range of model pitch attitudes than has been possible hitherto, up to a maximum of a 90 degree angle of attack. It is based on the use of self-scanning photodiode arrays and illuminating laser light beams, together with purpose built processing electronics. The principles behind the design of the system are discussed, together with the results of testing one channel of the system which was used to control the axial position of a magnetically suspended model in SUMSBS. The removal of optically coupled heave position information from the axial position sensing channel is described.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-178358 , NAS 1.26:178358 , AASU-87/3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Progress towards extreme attitude testing with Magnetic Suspension and Balance Systems (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Progress is reported in a research effort aimed towards demonstration of the feasibility of suspension and aerodynamic testing of models at high angles of attack in wind tunnel Magnetic Suspension and Balance Systems. Extensive modifications, described in this paper, have been made to the Southampton University suspension system in order to facilitate this work. They include revision of electromagnet configuration, installation of all-new position sensors and expansion of control system programs. An angle of attack range of 0 to 90 deg is expected for axisymmetric models. To date, suspension up to 80 deg angle of attack has been achieved.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AIAA PAPER 88-2012 , Aerodynamic Testing Conference; May 18, 1988 - May 20, 1988; San Diego, CA; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Digital control of wind tunnel magnetic suspension and balance systems (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Digital controllers are being developed for wind tunnel magnetic suspension and balance systems, which in turn permit wind tunnel testing of aircraft models free from support interference. Hardware and software features of two existing digital control systems are reviewed. Some aspects of model position sensing and system calibration are also discussed.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: ICIASF ''87 - International Congress on Instrumentation in Aerospace Simulation Facilities; Jun 22, 1987 - Jun 25, 1987; Williamsburg, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    NASA Glenn Research Center Solar Cell Experiment Onboard the International Space Station (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Accurate air mass zero (AM0) measurement is essential for the evaluation of new photovoltaic (PV) technology for space solar cells. The NASA Glenn Research Center (GRC) has flown an experiment designed to measure the electrical performance of several solar cells onboard NASA Goddard Space Flight Center's (GSFC) Robotic Refueling Missions (RRM) Task Board 4 (TB4) on the exterior of the International Space Station (ISS). Four industry and government partners provided advanced PV devices for measurement and orbital environment testing. The experiment was positioned on the exterior of the station for approximately eight months, and was completely self-contained, providing its own power and internal data storage. Several new cell technologies including four-junction (4J) Inverted Metamorphic Multi-junction (IMM) cells were evaluated and the results will be compared to ground-based measurement methods.
    Keywords: Energy Production and Conversion
    Type: GRC-E-DAA-TN32384 , IEEE Photovoltaic Specialists Conference; Jun 05, 2016 - Jun 10, 2016; Portland, OR; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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