User's Manual for a Computer Program to Calculate Discrete Frequency Noise of Convention and Advanced PropellersNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1981 - Propellers, Aerial - 86 pages |
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1.0 Time Period 20 EXAMPLE 25 30 Harmonic 30 Harmonic Number advanced propellers airfoil angle of attack appendix blade geometry blade panels blade surface CALL PCS ER2 camber CAMRAT chordwise CMBR CMBRP computer program COPYBR data array Data Sheet dB re 20 defined DRAG NOISE emission FREQUENCY NOISE FUNE2 graphic output Harmonic Number BPF helical INDEXSL INPUT SUBROUTINES KRUD Langley Research Center leading edge LED2 LEDP lift coefficients M/SEC Mach number msec MTRANS namelist input NCHF noise calculations NOISE COMPONENTS EXAMPLE NOISE NOISE NOISE nondimensional NPCA NPCAF NPROPFN NPTS NSPEC OASPL observer position parameters pitch change axis pressure signature printed output program PROPFAN PROPELLER INPUT FUNCTIONS PROPFAN radial location rotates SIGMAU skin friction sound pressure level SPECTRUM Acoustic Pressure SPEED PROPELLER INPUT SUBROUTINE FUNPRES subsonic supersonic SURFP THICKNESS NOISE THKMAXL THKP THKRATP tip speeds transonic/supersonic undisturbed medium