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Airplanes -- Air ducts -- Noise -- Mathematical models

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• Airplanes -- Air ducts -- Noise
• Airplanes -- Noise -- Mathematical models

• Numerical simulation of noise propagation in jet engine ducts (National Aeronautics and Space Administration ;, 1973), by Kenneth J. Baumeister, Edward C. Bittner, United States National Aeronautics and Space Administration, and Lewis Research Center (page images at HathiTrust)

Items below (if any) are from related and broader terms.

• Measured and calculated acoustic attenuation rates of tuned resonator arrays for two surface impedance distribution models with flow (National Aeronautics and Space Administration, Scientific and Technical Information Division ;, 1988), by Tony L. Parrott, Michael G. Jones, A. Louis Abrahamson, and Langley Research Center (page images at HathiTrust)
• Spinning mode sound propagation in ducts with acoustic treatment (National Aeronautics and Space Administration ;, 1975), by Edward J. Rice and Lewis Research Center (page images at HathiTrust)
• Analysis of sound propagation in ducts using the wave envelope concept (National Aeronautics and Space Administration ;, 1974), by Kenneth J. Baumeister (page images at HathiTrust)

• Frequency dependence of sound transmitted from an airborne source into the ocean (Naval Postgraduate School, 1972), by Herman Medwin and R. A Helbig (page images at HathiTrust; US access only)
• A closed-form solution for noise contours (National Aeronautics and Space Administration, scientific and technical Information Branch ;, 1979), by Elwood C. Stewart, Thomas M. Carson, Ames Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Experimental atmospheric absorption values from aircraft flyover noise signals (National Aeronautics and Space Administration, 1971), by Dwight E. Bishop, Myles A. Simpson, David T. Chang, United States National Aeronautics and Space Administration, Langley Research Center, and Beranek Bolt (page images at HathiTrust)

• The radiation of sound from a propeller at angle of attack (National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ;, 1990), by Ramani Mani, Lewis Research Center, and General Electric Company. Research and Development Center (page images at HathiTrust)

• The NASA Aircraft Noise Prediction Program improved Propeller Analysis System (National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program ;, 1991), by L. Cathy Nguyen, Lockheed Engineering & Sciences Company, and Langley Research Center (page images at HathiTrust)
• Computational methods in the prediction of advanced subsonic and supersonic propeller induced noise--ASSPIN user's manual (National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992), by M. H. Dunn, G. M. Tarkenton, Langley Research Center, and Lockheed Engineering & Sciences Company (page images at HathiTrust)

• Analytical investigation of fan tone noise due to ingested atmospheric turbulence (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1980), by Ulrich W. Ganz, Langley Research Center, and Boeing Commercial Airplane Company (page images at HathiTrust)
• Numerical simulation of noise propagation in jet engine ducts (National Aeronautics and Space Administration ;, 1973), by Kenneth J. Baumeister, Edward C. Bittner, United States National Aeronautics and Space Administration, and Lewis Research Center (page images at HathiTrust)
• Combined quadrupole-dipole model for inlet flow distortion noise from a subsonic fan (National Aeronautics and Space Administration ;, 1974), by Marvin E. Goldstein, Thomas F. Gelder, James H. Dittmar, and Lewis Research Center (page images at HathiTrust)

• Combined quadrupole-dipole model for inlet flow distortion noise from a subsonic fan (National Aeronautics and Space Administration ;, 1974), by Marvin E. Goldstein, Thomas F. Gelder, James H. Dittmar, and Lewis Research Center (page images at HathiTrust)
• Optimal one-section and two-section circular sound-absorbing duct liners for plane-wave and monopole sources without flow (National Aeronautics and Space Administration ;, 1976), by Harold C. Lester, Joe W. Posey, and United States National Aeronautics and Space Administration (page images at HathiTrust)