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  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (453)
  • 1990-1994  (453)
  • 1991  (453)
  • 1
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    Thermal and structural analysis of the GOES scan mirror's on orbit performance (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The on-orbit performance of the GOES satellite's scan mirror has been predicted by means of thermal, structural, and optical models. A simpler-than-conventional thermal model was used to reduce the time required to obtain orbital predictions, and the structural model was used to predict on-earth gravity sag and on-orbit distortions. The transfer of data from the thermal model to the structural model was automated for a given set of thermal nodes and structural grids.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: In: Analysis of optical structures; Proceedings of the Meeting, San Diego, CA, July 23, 24, 1991 (A93-38415 15-37); p. 170-176.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Thermal elastic shock and its effect on TOPEX spacecraft attitude control (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Thermal elastic shock (TES) is a twice per orbit impulsive disturbance torque experienced by low-Earth orbiting spacecraft. The fundamental equations used to model the TES disturbance torque for typical spacecraft appendages (e.g., solar arrays and antenna booms) are derived in detail. In particular, the attitude-pointing performance of the TOPEX spacecraft, when subjected to the TES disturbance, is analyzed using a three-axis nonlinear time-domain simulation. Results indicate that the TOPEX spacecraft could exceed its roll-axis attitude-control requirement during penumbral transitions, and remain in violation for approximately 150 sec each orbit until the umbra collapses. A localized active-control system is proposed as a solution to minimize and/or eliminate the degrading effects of the TES disturbance.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AAS PAPER 91-056 , In: Guidance and control 1991; Proceedings of the Annual Rocky Mountain Guidance and Control Conference, Keystone, CO, Feb. 2-6, 1991 (A93-15576 03-12); p. 311-336.
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    NASA TECHNICAL REPORTS
  • 3
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    Autonomous rendezvous and docking: A commercial approach to on-orbit technology validation (1991)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: SpARC, in conjunction with its corporate affiliates, is planning an on-orbit validation of autonomous rendezvous and docking (ARD) technology. The emphasis in this program is to utilize existing technology and commercially available components wherever possible. The primary subsystems to be validated by this demonstration include GPS receivers for navigation, a video-based sensor for proximity operations, a fluid connector mechanism to demonstrate fluid resupply capability, and a compliant, single-point docking mechanism. The focus for this initial experiment will be ELV based and will make use of two residual Commercial Experiment Transporter (COMET) service modules. The first COMET spacecraft will be launched in late 1992 and will serve as the target vehicle. After the second COMET spacecraft has been launched in late 1994, the ARD demonstration will take place. The service module from the second COMET will serve as the chase vehicle.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA Automated Rendezvous and Capture Review. Executive Summary; p 31-32
    Format: application/pdf
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  • 4
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    Aero-Space Plane: Flexible Access to Space (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The most recently designed X-30 (National Aerospace Plane) is described. The video feature also chronicles the development of the X-plane series, beginning with the X-1.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-109904 , NONP-NASA-VT-94-23146 , ASR-257
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  • 5
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    A spacecraft charging study on the SCEX 3 rocket (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Instruments on the SCEX 3 rocket payload were used to study charging during electron beam emissions. The data show that electrostatic analyzers can be used to measure vehicle charging and direct beam return currents in dense plasma conditions. The data also show return current dependencies on pitch angle, beam current and beam energy. It is found that if the proper care is taken, ESAs can be used to detect charging on vehicles in low altitude orbits which are contaminated with high levels of outgassing and in dense plasma regimes. These results are particularly important for the TSS-1 electrodynamic tether program where ESAs are being used to determine Shuttle charging levels during tether employment and to look for high fluxes of directly returning electrons during electron generator operations to balance the Shuttle charging.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); 38; 1622-162
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  • 6
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    Advanced Communications Technology Satellite (ACTS) (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The NASA Advanced Communications Technology Satellite (ACTS) provides high risk technologies having the potential to dramatically enhance the capabilities of the satellite communications industry. This experimental satellite, which will be launched by NASA in 1993, will furnish the technology necessary for providing a range of services. Utilizing the ACTS very-high-gain-hopping spot-beam antennas with on-board routing and processing, Very Small Aperture Terminal (VSAT) digital networks which provide on-demand, full-mesh-convectivity 1.544-MBPS services with only a single hop can be established. The high-gain spot-beam antenna at Ka-band permits wide area, flexible networks providing high data rate services between modest-size earth terminals.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Princeton/AIAA/SSI Conference; May 15, 1991 - May 18, 1991; Princeton, NJ; United States
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  • 7
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    Beyond the Baseline 1991: Proceedings of the Space Station Evolution Symposium. Volume 2: Space Station Freedom, part 2 (1991)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Individual presentations delivered at the Space Station Evolution Symposium in League City, Texas, on August 6, 7, and 8, 1991 are given in viewgraph form. Personnel responsible for Advanced Systems Studies and Advanced Development within the Space Station Freedom Program reported on the results of their work to date. Special attention is given to highlighting changes made during restructuring; a description of the growth paths through the follow-on and evolution stages; identification of the minimum impact provisions to allow flexibility in the baseline; and identification of enhancing and enabling technologies.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CP-10083-VOL-2-PT-2 , S-653-VOL-2-PT-2 , NAS 1.55:10083-VOL-2-PT-2 , Aug 06, 1991 - Aug 08, 1991; League City, TX; United States
    Format: application/pdf
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  • 8
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    Space Station Freedom science utilization: 2000 and beyond (1991)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The Office of Space Science and Applications (OSSA) Goals are: (1) to advance scientific knowledge of the Earth, the Solar System, and the Universe; (2) to understand the effects of the space environment on biological and physical processes; and (3) to expand the human presence beyond the Earth into the Solar System. The topics covered are presented in view graph form and include the following: (1) a strategic plan; (2) evolving U.S. space science capabilities; (3) life science goals; (4) OSSA Space Station Payload Traffic Model May 1991; and (5) microgravity science and applications goals.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Beyond the Baseline 1991: Proceedings of the Space Station Evolution Symposium. Volume 1: Space Station Freedom, Part 1; p 179-201
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  • 9
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    Space Station Freedom Evolution Symposium (1991)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Information on the Space Station Freedom Evolution Symposium is given in viewgraph form. Topics covered include industry development needs and the Office of Commercial Programs strategy, the three-phase program to develop commercial space, Centers for the Commercial Development of Space (CCDS), key provisions of the Joint Endeavor agreement, current commercial flight experiment requirements, the CCDS expendable launch vehicle program, the Commercial Experiment Transporter (COMET) program, commercial launch dates, payload sponsors, the commercial roles of the Space Station Freedom, and a listing of the Office of Commercial Programs Space Station Freedom payloads.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Beyond the Baseline 1991: Proceedings of the Space Station Evolution Symposium. Volume 1: Space Station Freedom, Part 1; p 121-155
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  • 10
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    Space Station Freedom status (1991)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Several graphs are presented which illustrate the restructuring activities of the Space Station Freedom. The restructed SSF program meets the objectives including cost guidelines. The solution adopted best features from alternative concepts. The SSF program allows significantly greater utilization opportunities than other programs. It was decided that pre-integration simplifies on-orbit assembly planning and operations. The SSF permanently manned configuration is shown.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Beyond the Baseline 1991: Proceedings of the Space Station Evolution Symposium. Volume 1: Space Station Freedom, Part 1; p 1-19
    Format: application/pdf
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