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  • Other Sources  (14)
  • 1975-1979  (14)
  • 1979  (14)
  • 1
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    Manufacture of DPFC-DMS polymer in the SKG range (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: BPFC-DMS block copolymers were synthesized on a pre-pilot scale (i.e., to 5 Kg lots) and subsequently fabricated into clear, colorless films. Details of the synthesis procedures, property determinations, and film casting techniques are presented. Solubility, viscosity and molecular weight characteristics of the resulting product are reported.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-166276 , NAS 1.26:166276
    Format: application/pdf
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  • 2
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    Flammability screening tests of resins (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Selected flammability characteristics of glass cloth laminates of thermosetting resins are evaluated. A protocol for the evaluation of the flammability hazards presented by glass cloth laminates of thermosetting resins and the usefulness of that protocol with two laminates are presented. The glass laminates of an epoxy resin, M-751 are evaluated for: (1) determination of smoke generation from the laminates; (2) analysis of products of oxidative degradation of the laminates; (3) determination of minimum oxygen necessary to maintain flaming oxidation; (4) evaluation of toxicological hazards.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-152312 , UTEC-79-140
    Format: application/pdf
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  • 3
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    TACAN operational description for the space shuttle orbital flight test program (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The TACAN subsystems (three TACAN transponders, six antennas, a subsystem operating program, and redundancy management software in a tutorial form) are discussed and the interaction between these subsystems and the shuttle navigation system are identified. The use of TACAN during the first space transportation system (STS-1), is followed by a brief functional description of the TACAN hardware, then proceeds to cover the software units with a view to the STS-1, and ends with a discussion on the shuttle usage of the TACAN data and anticipated performance.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-160775 , LEC-13790 , JSC-16276
    Format: application/pdf
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  • 4
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    Optimal control of sun tracking solar concentrators (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Application of the modern control theory to derive an optimal sun tracking control for a point focusing solar concentrator is presented. A standard tracking problem converted to regulator problem using a sun rate input achieves an almost zero steady state tracking error with the optimal control formulation. However, these control techniques are costly because optimal type algorithms require large computing systems, thus they will be used mainly as comparison standards for other types of control algorithms and help in their development.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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  • 5
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    Pointing errors in solar dish collectors (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Mathematical analysis calculates effects of transient pointing errors in solar dish collectors treating each pointing error separately. This approach considerably simplifies programming of simulation models for tracking drive, wind effects, and other design parameters.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-14630 , NASA Tech Briefs (ISSN 0145-319X); 4; 2; P. 200
    Format: text
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  • 6
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    Flexible space structure model reduction by modal cost analysis (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is noted that reduced models and reduced controllers for flexible space structures are obtained by retaining those modes which make the greatest contribution to quadratic control objectives. Attention is given to the relative importance of damping, frequency and mode shapes in the mode truncation decisions for the following control objectives: attitude control, vibration suppression and figure control. It is also shown that using Modal Cost Analysis (MCA) on the closed loop modes of the optimally controlled system allows the construction of reduced control policies which feedback only those closed loop coordinates which are most critical to the quadratic control performance criterion. In this manner, the modes which need to be controlled are deduced from truncations of the optimal controller.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Dynamics and control of large flexible spacecraft; Jun 21, 1979 - Jun 23, 1979; Blacksburg, VA
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  • 7
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    Controllability and observability for flexible spacecraft (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Current interest in extended sensing and actuation for the control of flexible spacecraft has led to the use of modern multivariable control theory and the associated concepts of controllability and observability. This paper shows how to evaluate these properties on a mode-by-mode basis for flexible spacecraft control analysis. Relatively simple criteria are derived which indicate the degree of controllability (observability) of each mode in simple literal terms. These criteria provide physical insight and practical guidance on the type, number, and positioning of sensors and actuators. The results are interpreted for force and torque actuators, and for attitude and deformation measurements. To illustrate these ideas, sample controllability and observability 'surfaces' are presented for the Purdue generic flexible spacecraft model.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Dynamics and control of large flexible spacecraft; Jun 21, 1979 - Jun 23, 1979; Blacksburg, VA
    Format: text
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  • 8
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    Phase change in liquid face seals. II - Isothermal and adiabatic bounds with real fluids (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Analytical studies of phase change effects in parallel and tapered liquid face seals are presented. An isothermal and adiabatic model of low Reynolds number flow are considered by numerical integration of the descriptive equations for a real fluid, and its thermodynamic properties are calculated for each step, using a computer program for the steam tables or fluid thermodynamic properties. It was shown that for low leakage rate the isothermal model is more accurate and for high leakage rates the adiabatic model is more accurate; that both models yield the same conclusions regarding stability; and that the transient of collapse is described by the adiabatic model which predicts a catastrophic collapse and then either failure or explosive return to a larger film thickness value. Finally, it is shown that converging seals may become unstable and the mass leakage rate is reduced significantly below the all liquid value when boiling occurs.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 79-LUB-4 , Lubrication Conference; Oct 16, 1979 - Oct 18, 1979; Dayton, OH
    Format: text
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  • 9
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    Characteristics of the Telescope for High Energy Gamma-ray Astronomy Selected for Definition Studies on the Gamma Ray Observatory (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The high energy gamma-ray selected for definition studies on the Gamma Ray Observatory provides a substantial improvement in observational capability over earlier instruments. It will have about 20 times more sensitivity, cover a much broader energy range, have considerably better energy resolution and provide a significantly improved angular resolution. The design and performance are described.
    Keywords: ASTRONOMY
    Type: NASA-TM-80590 , IEEE 1979 Sci. Symp.; Oct 17, 1979 - Oct 19, 1979; San Francisco
    Format: application/pdf
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  • 10
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    Energetic particle precipitation into the high-latitude ionosphere and the auroral electrojets. II - Eastward electrojet and field-aligned current flow at the dusk meridian (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; May 1
    Format: text
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