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  • AERODYNAMICS  (5)
  • 1980-1984  (4)
  • 1970-1974  (1)
  • 1
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    Some after-dinner reflections on system identification (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The growth of the field of system identification is discussed along with changes in methodology which have taken place in recent years. The similarity between pattern recognition and system identification is pointed out, involving the modelling in the latter and the feature selection problem in the former. It is stated that once a model is formulated, including the disturbances and measurement errors, the parameter finding can be formulated as a statistical estimation problem. The various techniques and their application are discussed.
    Keywords: AERODYNAMICS
    Type: NASA. Flight Res. Center Parameter Estimation Tech. and Appl. in Aircraft Flight Testing; p 381-385
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Viscous real gas flowfields about three dimensional configurations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Laminar, real gas hypersonic flowfields over a three dimensional configuration are computed using an unsteady, factored implicit scheme. Local chemical and thermodynamic properties are evaluated by an equilibrium composition method. Transport properties are obtained from individual species properties and application of a mixture rule. Numerical solutions are presented for an ideal gas and equilibrium air for free-stream Mach numbers of 13 and 15 and at various angles of attack. The effect of real gas is to decrease the shock-layer thickness resulting from decreased shock-layer temperatures and corresponding increased density. The combined effects of viscosity and real gas are to increase the subsonic layer near the wall.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 83-1511
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Calculation of the transient motion of elastic airfoils forced by control surface motion and gusts (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The time-domain equations of motion of elastic airfoil sections forced by control surface motions and gusts were developed for the case of incompressible flow. Extensive use was made of special functions related to the inverse transform of Theodorsen's function. Approximations for the special cases of zero stream velocity, small time, large and time are given. A numerical solution technique for the solution of the general case is given. Examples of the exact transient response of an airfoil are presented.
    Keywords: AERODYNAMICS
    Type: NASA-TM-81351 , H-1125 , REPT-505-36-24
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Real gas flow fields about three dimensional configurations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Real gas, inviscid supersonic flow fields over a three-dimensional configuration are determined using a factored implicit algorithm. Air in chemical equilibrium is considered and its local thermodynamic properties are computed by an equilibrium composition method. Numerical solutions are presented for both real and ideal gases at three different Mach numbers and at two different altitudes. Selected results are illustrated by contour plots and are also tabulated for future reference. Results obtained compare well with existing tabulated numerical solutions and hence validate the solution technique.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 83-0581 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 10, 1983 - Jan 13, 1983; Reno, NV
    Format: text
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  • 5
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    Flowfield computation of an aerobrake orbital transfer vehicle (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Viscous real gas and ideal gas supersonic flowfields over the forebody of a aeroassisted orbital transfer vehicle are determined using a unsteady factored implicit algorithm. Air in chemical equilibrium is considered and its local thermodynamic properties are computed by an equilibrium composition method. Numerical solutions are obtained for both real and ideal gases at a Mach number of 30 and at angles of attack up to 20 degrees. Shock stand-off distances and surface pressure distributions are presented for the gas models with and without viscous effects. For the freestream conditions considered, viscous effects dominate the flow.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 84-1697
    Format: text
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