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  • AERODYNAMICS  (2)
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    An efficient algorithm using matrix methods to solve wind tunnel force-balance equations (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An iterative procedure applying matrix methods to accomplish an efficient algorithm for automatic computer reduction of wind-tunnel force-balance data has been developed. Balance equations are expressed in a matrix form that is convenient for storing balance sensitivities and interaction coefficient values for online or offline batch data reduction. The convergence of the iterative values to a unique solution of this system of equations is investigated, and it is shown that for balances which satisfy the criteria discussed, this type of solution does occur. Methods for making sensitivity adjustments and initial load effect considerations in wind-tunnel applications are also discussed, and the logic for determining the convergence accuracy limits for the iterative solution is given. This more efficient data reduction program is compared with the technique presently in use at the NASA Langley Research Center, and computational times on the order of one-third or less are demonstrated by use of this new program.
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-6860 , L-8278
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Measured response of a complex structure to supersonic turbulent boundary layers (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of the response of a large frame-stringer panel excited by supersonic turbulent boundary layer are reported. The statistical description of the wall pressure fluctuations in terms of the mean flow parameters governing the turbulent boundary layer is given. These results can be used in the development of design criteria on the response of sidewall structure of a large airplane in supersonic flight, since both forcing field and structure are realistic. Results indicate the significant importance of the modal coupling and the acoustic damping. The acoustic damping plays a major role in the response of the structure.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 76-83 , Aerospace Sciences Meeting; Jan 26, 1976 - Jan 28, 1976; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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