## A numerical technique for calculation of the noise of high-speed propellers with advanced blade geometryPaul A. Nystrom, F. Farassat, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, Langley Research Center National Aeronautics and Space Administration, Scientific and Technical Information Office, 1980 - Technology & Engineering - 30 pages |

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acoustic calculations acoustic formulation acoustic pressure signature acoustic spectrum advanced geometry advanced propellers Aeroacoustics aircraft Algorithms angle azimuthal coordinate blade geometry blade surface chord chordwise pressure distribution computer program conventional propeller curve of intersection curvilinear coordinate system dB re 20 Dirac delta function divided into panels equation 12 Farassat Find emission function Harmonic number helical Mach number i i i i i i i i i ical Langley Research Center lift coefficient linear acoustic lower surfaces measured acoustic data measured data method moving frame NACA NASA noise calculations noise of propellers noise prediction numerical technique observer position panels moving paper discusses parabola pitch change axis predicting the noise propeller axis Propeller Noise propellers with advanced quadrupole radiation direction radiation vector roots of equation scheme sinusoidal curve sound pressure level spectra speed of sound SR-3 blade design subroutine tions undisturbed medium upper and lower wave equation x3-axis