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  • Other Sources  (9)
  • 1980-1984  (3)
  • 1970-1974  (6)
  • 1930-1934
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  • 1
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    Robust Kalman filter design for active flutter suppression systems (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Additional insight is provided into the use of the Doyle-Stein (1979, 1981) technique in aeroelastic control problems by examining the application of the method to a flutter control problem. The system to be controlled consists of a full-size wind tunnel model of a wing, plus an aileron, an actuator, and an accelerometer used to sense the motion of the wing. A full-state feedback controller was designed using linear optimal control theory, and a Kalman filter was used in the feedback loop for state estimation. The filter design procedure is explained along with that to improve closed-loop properties of the system. The locus of the poles of the filter is examined as a scalar design parameter is varied. The Doyle-Stein design procedure is shown to substantially improve the stability properties of an active flutter controller designed using the linear quadratic Gaussian control theory.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Asteroid selection for mission opportunities (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study to assess the present state of knowledge of asteroids as well as the rate of change of that knowledge to better identify the mission and target priorities for advanced planning of asteroidal flights in the 1980's is presented. Topics discussed include; the present state of asteroid knowledge, the scientific goals and priorities attached to asteroid exploration, the anticipated advances in knowledge over the current decade, asteroid mission consideration, and asteroid selection. Data sheets for 118 asteroids are contained. These are asteroids for which some data is available over and above orbital parameters and magnitude.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-129247 , P-42
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Concentric tubes cold-bonded by drawing and internal expansion (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Metal tubes bonded together without heat application or brazing materials retain strength at elevated temperatures, and when subjected to constant or cyclic temperature gradients. Combination drawing and expansion process produces residual tangential tensile stress in the outer tube and tangential compressive stress in the inner tube.
    Keywords: FABRICATION TECHNOLOGY
    Type: ARG-90033
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of control systems for space shuttle vehicles, volume 1 (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Control of winged two-stage space shuttle vehicles was investigated. Control requirements were determined and systems capable of meeting these requirements were synthesized. Control requirements unique to shuttles were identified. It is shown that these requirements can be satisfied by conventional control logics. Linear gain schedule controllers predominate. Actuator saturations require nonlinear compensation in some of the control systems.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-1899 , HONEYWELL-14257-FR-VOL-1
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    NASA TECHNICAL REPORTS
  • 5
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    Development of control systems for space shuttle vehicles. Volume 2: Appendixes (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A launch phase random normal wind model is presented for delta wing, two-stage, space shuttle control system studies. Equations, data, and simulations for conventional launch studies are given as well as pitch and lateral equations and data for covariance analyses of the launch phase of MSFC vehicle B. Lateral equations and data for North American 130G and 134D are also included along with a high-altitude abort simulation.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-1900 , HONEYWELL-14257-FR-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Ferromagnetic resonance intensity - A rapid method for determining lunar glass bead origin (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Ferromagnetic resonance intensity, I(s), relies on the absence or presence of single-domain Fe formed during impact melting by autoreduction of Fe(2+) in the melt to distinguish volcanic from impact glass spherules in the lunar soil. SEM inspection of individual glass bead surfaces gave reliable evidence of the mode of glass genesis. Ferromagnetic resonance intensity was tested against the Apollo 15 and 17 volcanics. I(s) values of less than one were found in 94% of the volcanic glasses, implying the absence of single-domain Fe, while 75% of the impact glasses had elevated I(s) values. These samples lack single-domain Fe, and may represent impact melts of bedrock with little or no regolith contribution. Both the primary discrimination of volcanic and impact glasses, and the secondary one of bedrock-derived impact melts from impact melts partially or entirely derived from regolith, have been demonstrated for the I(s) technique.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 15, 1982 - Mar 19, 1982; Houston, TX
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    NASA TECHNICAL REPORTS
  • 7
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    Technology transfer to a developing nation, Korea (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An experimental project is reported which was undertaken. to determine if selected types of technology developed for the aerospace program during the past decade are relevant to specific industrial problems of a developing nation and to test whether a structured program could facilitate the transfer of relevant technologies. The Korea Institute of Science and Technology and the IIT Research Institute were selected as the active transfer agents to participate in the program. The pilot project was based upon the approach to the transfer of domestic technology developed by the NASA Technology Utilization Division and utilized the extensive data and technical resources available through the Space Agency and its contractors. This pilot project has helped to clarify some aspects of the international technology transfer process and to upgrade Korean technological capabilities.
    Keywords: GENERAL
    Type: NASA-CR-133358
    Format: application/pdf
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  • 8
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    Cost estimation for unmanned lunar and planetary programs (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A basic model is presented for estimating the cost of unmanned lunar and planetary programs. Cost data were collected and analyzed for eight lunar and planetary programs. Total cost was separated into the following components: labor, overhead, materials, and technical support. The study determined that direct labor cost of unmanned lunar and planetary programs comprises 30 percent of the total program cost. Twelve program categories were defined for modeling: six spacecraft subsystem categories (science, structure, propulsion, electrical power, communications, and guidance and integration, test and quality assurance, launch and flight operations, ground equipment, systems analysis and engineering, and program management). An analysis showed that on a percentage basis, direct labor cost and direct labor manhours compare on a one-to-one ratio. Therefore, direct labor hours is used as the parameter for predicting cost, with the advantage of eliminating the effect of inflation on the analysis.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-131897 , C-10
    Format: application/pdf
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  • 9
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    Active flutter suppression using Linear Quadratic Gaussian theory (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the application of Linear Quadratic Gaussian (LQG) methodology to the design of active control systems for suppression of aerodynamic flutter. A full-size wind tunnel model of a supercritical wing with associated sensors and actuators comprises the system to be controlled. Results of a synthesis methodology that provide small values of rms response, insensitivity to flight condition, and robust stability are presented. Results of control surface and sensor position optimization are also presented. Both frequency response matching and residualization are used to obtain practical flutter controllers.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 80-1758 , Guidance and Control Conference; Aug 11, 1980 - Aug 13, 1980; Danvers, MA
    Format: text
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