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  • 1
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    Application of quasi-linearization techniques to the analysis of aerodynamic-noise fields (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The method of parametric differentiation was used as a means of obtaining solutions which describe aerodynamically generated sound fields, and which are valid over an increased range of a specific parameter. Details of applying the method to the problem of calculating the sound field of two rectilinear vortices rotating about an axis between them in a compressible medium are discussed. Pressure distribution in the far field are obtained. Parametric differentiation was also applied to the calculation of aerodynamic sound generated by a rotating cylinder in a viscous, compressible medium. The formulation of this problem in parametric space is given, and a procedure for obtaining a solution is outlined.
    Keywords: PHYSICS, GENERAL
    Type: NASA-CR-112084 , AEEP-4074-105-72U
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Farfield viscous effects in nonlinear noise propagation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Discussion of the method of parametric differentiation in application to predictions of farfield noise propagation in both lossless and dissipative media. It is shown that, in the lossless medium, the governing equation, transformed to parameter space, reduces to a wave equation in the farfield. In the dissipative medium, the system of nonlinear partial differential equations, transformed to parameter space, reduces to a linear partial differential equation of the propagating type which contains a third-order derivative as well as the wave operator.
    Keywords: AERODYNAMICS
    Format: text
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    NASA TECHNICAL REPORTS
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