Acoustic Scattering by Circular Cylinders of Various Aspect RatiosNational Aeronautics and Space Administration, Scientific and Technical Information Office, 1979 - Sound pressure - 48 pages |
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0.25 Cylinder Body 0.5 Cylinder 0.5 Cylinder Body 0.5 FRONT END 0.6 1 POSITION 15 Pressure Phase 19 Pressure acoustic pressure Acoustic Scattering Aeroacoustics anechoic chamber Anechoic Room BACK END FACE Body at ka calibrated circular cylindrical models condenser microphones cylinder axis Cylinders Having L/D Cylindrical Model decibels END FACE BACK EXP THEOR FRONT experimental data FACE BACK END finite difference front and back FRONT END FACE incidence angles Inside the Anechoic Inside the Cylindrical installed from inside L/D Body L/D ratios Langley Research Center LD LD LD longer cylinder loudspeaker microphone body microphone holder model end face NASA Langley Research PG microphone phase differences POSITION X Fig preamplifiers pressure augmentation ratio pressure gradient microphones Pressure Phase Variations relative phase angles scattering effects scattering model Scattering parameter variations shown in Fig sound source Surface Pressure Augmentation THEOR FRONT END theoretical predictions THETA FREQ PI