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  • AERODYNAMICS  (7)
  • ELECTRONIC COMPONENTS AND CIRCUITS  (6)
  • AIRCRAFT PROPULSION AND POWER
  • General Chemistry
  • 1985-1989  (13)
Collection
Keywords
Years
Year
  • 1
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    Transient induced drag (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In the present treatment of the calculation of forces on a wing that is suddenly brought into motion at a constant speed, attention is given to the unsteady potential's contribution to the force balance. Total bound vorticity is produced at the initial impulse. The results obtained are independent of wing aspect ratio; as time increases, this effect on the drag force becomes smaller as the vortex emanating from the trailing edge is left behind. The second contributor to induced drag is the spanwise vorticity shedding that results from the spanwise load distribution of three-dimensional wings. This contribution grows with time as the length of the wake grows.
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 1203-120
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Modeling aerodynamic responses to aircraft maneuvers - A numerical validation (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 23; 19-25
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Application of CFD techniques toward the validation of nonlinear aerodynamic models (1985)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Applications of computational fluid dynamics (CFD) methods to determine the regimes of applicability of nonlinear models describing the unsteady aerodynamic responses to aircraft flight motions are described. The potential advantages of computational methods over experimental methods are discussed and the concepts underlying mathematical modeling are reviewed. The economic and conceptual advantages of the modeling procedure over coupled, simultaneous solutions of the gas dynamic equations and the vehicle's kinematic equations of motion are discussed. The modeling approach, when valid, eliminates the need for costly repetitive computation of flow field solutions. For the test cases considered, the aerodynamic modeling approach is shown to be valid.
    Keywords: AERODYNAMICS
    Type: AGARD Unsteady Aerodynamics-Fundamentals and Applications to Aircraft Dynamics; 15 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Evaluation of an aerodynamic-load prediction method on a STOL fighter configuration (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A three-dimensional panel method was used to compute the aerodynamic loads on a large-scale, powered wind tunnel model. The size of the computation grid was selected such that turnaround times, on present computers remained satisfactory. With this constraint, the STOL aircraft configuration was modeled and the capabilities and limitations of the prediction method were investigated. After this study, a similar numerical model was established for a forward-swept-wing aircraft configuration which is planned for large-scale, low-speed testing. The resulting aerodynamic-load predictions are discussed and will be utilized, together with the future experimental results, to obtain a broader validation of this method as well as to reduce the necessary size of the matrix of the test parameters.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-0590
    Format: text
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  • 5
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    Evaluation of an aerodynamic-load prediction method on a STOL fighter configuration (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A three-dimensional panel method was used to compute the aerodynamic loads on a large-scale, powered wind tunnel model. The size of the computation grid was selected such that turnaround times, on present computers remained satisfactory. With this constraint, the STOL aircraft configuration was modeled and the capabilities and limitations of the prediction method were investigated. After this study, a similar numerical model was established for a forward-swept-wing aircraft configuration which is planned for large-scale, low-speed testing. The resulting aerodynamic-load predictions are discussed and will be utilized, together with the future experimental results, to obtain a broader validation of this method as well as to reduce the necessary size of the matrix of the test parameters.
    Keywords: AERODYNAMICS
    Type: NASA-TM-86782 , REPT-85358 , NAS 1.15:86782
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Improved Waveguide Laser Array (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Improved structure for integrated array of AlxGa1-xAs diode lasers causes array to oscillate predominantly in fundamental supermode (with all units at same phase), thereby producing intense, narrow light beam. New structure differs from older ones in that gain in spaces between laser channels is approximately equal to gain in channels.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-16500 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 49
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Integrated Laser and Light Detector (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Proposed infrared optical transmitter tracks distant beacon and automatically point transmitted beam toward beacon. Essential transmitter is integrated gallium arsenide device containing electronically-steerable semiconductor injection laser and position detector that senses direction to beacon. With satisfactory optics and sufficient power, system used for long-distance transmission.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-15943 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 450
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Semiconductor Laser Phased Array (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Oscillations synchronized and modulated individually for beam steering. Phased array of GaAs infrared lasers put out powerful electronically-steerable coherent beam. Fabricated as integrated circuit on GaAs chip, new device particularly suited to optical communications, optical data processing and optical detection and ranging systems.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-15963 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 317
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Damping Relaxation Oscillations in Laser Diodes (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Proposed semiconductor laser modulated at frequencies up to near its resonant frequency more efficiently than older devices. New laser uses two different effective carrier lifetimes: one for dc and lowfrequency operation and another for operation near resonant frequency. Laser part of bipolar transistor with capacitor that serves as ac short circuit.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-15980 , NASA Tech Briefs (ISSN 0145-319X); 9; 1; P. 45
    Format: text
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  • 10
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    Application of CFD techniques toward the validation of nonlinear aerodynamic models (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Applications of Computational fluid dynamics (CFD) methods to determine the regimes of applicability of nonlinear models describing the unsteady aerodynamic responses to aircraft flight motions are described. The potential advantages of computational methods over experimental methods are discussed and the concepts underlying mathematical modeling are reviewed. The economic and conceptual advantages of the modeling procedure over coupled, simultaneous solutions of the gasdynamic equations and the vehicle's kinematic equations of motion are discussed. The modeling approach, when valid, eliminates the need for costly repetitive computation of flow field solutions. For the test cases considered, the aerodynamic modeling approach is shown to be valid.
    Keywords: AERODYNAMICS
    Type: NASA-TM-86715 , REPT-85212 , NAS 1.15:86715 , AGARD Fluid Dyn. Panel and Flight Mech. Panel Symp. on Unsteady Aerodyn.: Fundamentals and Appl. to Aircraft Dyn.; May 06, 1985 - May 09, 1985; Gottingen; Germany
    Format: application/pdf
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