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  • Polymer and Materials Science  (2,161)
  • Inorganic Chemistry  (768)
  • SPACE VEHICLES  (556)
  • ASTROPHYSICS
  • 1990-1994
  • 1970-1974  (3,485)
  • 1965-1969
  • 1973  (3,485)
Collection
Keywords
Publisher
Years
  • 1990-1994
  • 1970-1974  (3,485)
  • 1965-1969
Year
  • 1
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    Attitude control of a spinning flexible spacecraft (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The dynamics of rotational motion of a spinning orbiting spacecraft consisting of two rigid bodies connected by a flexible joint and arbitrary number of flexible appendages (two of which are flexible massless booms having masses on their tips) is analyzed. Active attitude control is provided by momentum exchange devices (e.g. control moment gyroscopes) or a mass expulsion system. The linearized equations of motion describing the vehicle are presented, and a large scale digital simulation that has been developed at the Marshall Space Flight Center is presented. A simplified model of the geometrically complex vehicle is selected to make it analytically tractable. The simplified model consists of a single rigid core body with two attached flexible massless booms having tip masses. The states of the vehicle are defined as small perturbations about its steady-state spin. An analysis is performed to determine the domain of stability.
    Keywords: SPACE VEHICLES
    Type: Computer and Electrical Engineering; 1; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    SSS-A spacecraft and experiment description. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The scientific objectives of the Explorer-45 mission are discussed. The primary objective is the study of the ring current responsible for the main phase of magnetic storms. Closely associated with this objective is the determination of the relationship between magnetic storms, substorms, and the acceleration of charged particles in the magnetosphere. Further objectives are the measurement of a wide range of proton, electron and alpha-particle energies, and studies of wave-particle interactions responsible for particle transport and loss in the inner magnetosphere. The orbital parameters, the spacecraft itself, and some of its unique features, such as the data handling system, which is programmable from the ground, are described.
    Keywords: SPACE VEHICLES
    Type: Journal of Geophysical Research; 78; Aug. 1
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    NASA TECHNICAL REPORTS
  • 3
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    Mach number and Reynolds number effect on orbiter/tank interference heating. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Analysis of the variations in orbiter/tank interference heating rates in the Space Shuttle configuration at M numbers up to 19 and Re numbers down to 250,000. Experimental data on heat transfer rate distribution in the tank and on orbiter-induced interference heat transfer factors in the tank are included in diagrams. The data suggest that the primary effect of interference can be a fully developed turbulent boundary layer.
    Keywords: SPACE VEHICLES
    Type: Journal of Spacecraft and Rockets; 10; Aug. 197
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    NASA TECHNICAL REPORTS
  • 4
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    Fuel-optimal angular momentum vector control for spinning and dual-spin spacecraft. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The problem of fuel-optimal small-angle reorientation of the spin axis of a spinning or dual-spin spacecraft is examined. The results obtained show significant improvements over previously published optimization studies by virtue of the introduction of two innovations: (1) mass-explusion active control is utilized for angular momentum vector pointing only, with passive damping relied upon for stable vehicles to attenuate vehicle coning about the angular momentum vector, so that the task of the active controller changes from spin axis control to angular momentum vector control, and (2) several options are considered for type, number, and location of attitude control jets. The first of these considerations introduces a target set which is a smooth, two-dimensional linear manifold in the four-dimensional state space, whereas previous studies have adopted the origin as the target set. The second innovation amounts to consideration of a spectrum of control restraint sets.
    Keywords: SPACE VEHICLES
    Type: Astronautica Acta; 18; June 197
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  • 5
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    Lower payload costs through refurbishment and module replacement. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Payload benefits to be derived from refurbishment can be related to individual spacecraft programs directly and for planning purposes to the entire shuttle mission model. In the case of the large space telescope program, cost savings obtained through the use of the shuttle for maintenance operations have been estimated to be in the range from 30 to 40%. This saving is realized over an operational lifetime of 15 years by reducing, through refurbishment on orbit, the number of flight units along with 'optimized' reliability goals commensurate with periodic maintenance revisits at one-year intervals. Shuttle-era payload implications are discussed together with a pressurized on-orbit maintenance configuration, an earth observation satellite, and some typical teleoperator-serviced spacecraft.
    Keywords: SPACE VEHICLES
    Type: Astronautics and Aeronautics; 11; May 1973
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  • 6
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    The cylindrical electrostatic probes for Atmosphere Explorer -C, -D, and -E. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: This paper briefly describes the cylindrical electrostatic probes to be used on the new Atmosphere Explorer-C, -D, and -E, and outlines the methods to be employed to analyze the experimental data in terms of electron temperature and ion and electron concentration. Two independent cylindrical sensors and partially redundant electronic systems permit greater reliability in measurements. Measurements are made at 1-sec and 2-sec intervals along the orbit. The sensors themselves have been modified from previous applications to cope with the lower electron temperature expected in these low-altitude orbits and to counter possible surface contamination caused by the hydrazine engines used for orbit adjustments.
    Keywords: SPACE VEHICLES
    Type: Radio Science; 8; Apr. 197
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  • 7
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    A neutral-atmosphere composition experiment for the Atmosphere Explorer-C, -D, and -E. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The neutral-atmosphere composition experiment instrumentation is designed to obtain in-situ measurements of neutral thermosphere composition from Atmosphere Explorer-C, -D, and -E. The system is based on previously flown OGO-6 and San Marco-3 composition instruments. The mass-spectrometer sensor includes a gold-plated thermalizing chamber and ion source, a hyperbolic rod quadrupole analyzer, and an off-axis electron multiplier. Automatic ion-source sensitivity control and pulse-counting techniques provide density measurement capability from approximately 125 to 1000 km altitude. The normal operating mode includes measurement at all masses in the range of 1 to 44 amu, with emphasis on hydrogen, helium, oxygen, nitrogen, and argon.
    Keywords: SPACE VEHICLES
    Type: Radio Science; 8; Apr. 197
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    NASA TECHNICAL REPORTS
  • 8
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    Space science plans for the shuttle era. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Three separate and distinct modes of using the space shuttle system have been identified. These modes include the boost of a spacecraft plus one or more propulsion stages into earth orbit or parking orbit, the establishment and maintenance of automated observatories in space, and the support of exploratory research and instrument development. Studies show that approximately 60% of all planned NASA missions require a shuttle third stage. Illustrations are presented to show how the largest spacecraft, Viking, and its propulsion system, Centaur, and a communications satellite, with an Agena stage to place it into a geostationary orbit, would fit into the shuttle. Results of the NASA Shuttle Sortie Workshop studies are discussed together with prospects of European cooperation in future workshop experiments.
    Keywords: SPACE VEHICLES
    Type: Astronautics and Aeronautics; 11; May 1973
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  • 9
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    Airborne-science techniques aid Shuttle planning. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: In the sortie mode the Shuttle bay becomes a laboratory for a wide variety of space experiments and observations. Scientists and engineers can man this laboratory for investigations conducted in a space environment. A special program, called ASSESS (Airborne Science/Shuttle Experiment System Simulation) has been instituted to conduct exhaustive studies of the airborne-science concept as it may apply to Shuttle planning. The ASSESS program is described in detail together with the airborne-science operation pertinent to the Shuttle. Similarities of airborne science aircraft to the Shuttle are considered along with the results of a simulation mission, flown in October 1972.
    Keywords: SPACE VEHICLES
    Type: Astronautics and Aeronautics; 11; May 1973
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    NASA TECHNICAL REPORTS
  • 10
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    An extreme UV photometer for solar observations from Atmosphere Explorer. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A broadband photometer experiment is being prepared for the Atmosphere Explorer-C, -D, and -E missions to record the solar irradiance in seven wavelength bands in the range from 40 to 1250 A. The experiment contains four spiral electron multipliers located behind a moving eight-position filter wheel. Six of the eight sections of this wheel contain metallic filters used to spectrally isolate the solar irradiance. In addition, three Al2O3 diodes, two with filters, are being used to record the solar irradiance over the full range of orbital altitudes including those at which operation of multipliers with high voltages on open structures would be unsafe. A principal goal of the experiment will be to measure time dependence of the solar irradiance.
    Keywords: SPACE VEHICLES
    Type: Radio Science; 8; Apr. 197
    Format: text
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