Prediction of Flyover Jet Noise Spectra from Static TestsU.S. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1981 - Acoustical engineering - 24 pages |
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According to equation Aérotrain ambient ASPL axial contracted coordinate system cross spectral density DENSITY OF JET Doppler double integral emission angle equa equation 43 equations 55 equivalent static jet experimental results exponential term factor 01 Figure fixed with respect flight Mach number flyover coordinates flyover jet noise flyover noise frequency shift hot jets influence of flight jet axis jet turbulence jet velocity Langley Research Center mean square values NLR wind tunnel noise in flight Nst,s OASPL One-third-octave SPL-OASPL dB overall jet noise overall sound pressure peak frequency power spectral density Prediction Relative one-third-octave spectra Reynolds stress SAE-ARP sound intensity SOUND POWER SOUND POWER LEVEL sound pressure level source function source point source quantities source term specific thrust spectra of jet static and flyover static jet noise stretching parameter Strouhal number Nst,c,s tunnel flight simulation U₁ velocities Ue wind tunnel coordinates wind tunnel flight ΔΕ