Computer Science – Sound
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jsv....58..117f&link_type=abstract
Journal of Sound and Vibration, vol. 58, May 8, 1978, p. 117-126.
Computer Science
Sound
4
Acoustic Sounding, Correlation Detection, Jet Aircraft Noise, Sound Localization, Density Distribution, Far Fields, Helmholtz Equations, Jet Mixing Flow, Mach Number, Pressure Distribution, Strouhal Number, Turbulent Jets
Scientific paper
Three techniques for determining jet noise sources are discussed, the acoustic mirror, telescope, and polar correlation methods. In order to formulate a direct, self-consistent comparison of the methods, relevant jet aerodynamic and acoustic parameters are considered. It is noted that the techniques are limited by the spatial resolution which restricts them to jet noise at higher Strouhal and Mach numbers and by the interpretation of measured equivalent source strength density distributions. The assumption that the amplitude and phase of the pressure field radiated from compact elements of these distributions are uniform may not be valid when large scale coherent turbulence structures form part of the jet noise. In addition, various types of acoustic interference may cause noise source mislocation.
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