A study of resonant-cavity and fiberglass-filled parallel baffles as duct silencers
Paul T. Soderman, Ames Research Center, Aeromechnics Laboratory, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1982 - Technology & Engineering - 63 pages
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10-Foot Wind 120-Foot Wind Tunnel 4.9 STRAIGHT 406 mm thick acoustic impedance acoustic source Ames Research Center Baffle Geometry baffle length cavity damping cavity resonance cavity shapes characteristic impedance CONFIG cross modes diagonal septa Doelling downstream duct axis duct blockage duct lining Duct resonances DUCT SILENCERS duct width dynamic pressure equation exhaust simulation experimental fiberglass baffles fiberglass filler fiberglass silencer fiberglass-filled baffles flow speed flow-induced tones frequency Hz third-octave bands impedance inlet simulation Kurze m/sec measured microphone mks rayCs Moffett Field Mylar NASA PARALLEL BAFFLES parameters perforated skin predicting silencer pressure drop reactance rectangular cavities resonant-cavity baffles resonant-cavity silencer Scharton shown in figure silencer attenuation silencer insertion loss silencer performance skin porosity Soderman SOLID POROUS solid skin sound attenuation sound field sound level sound propagation STUDY OF RESONANT-CAVITY tail test section test-section tion transverse mode triangular cavities U.S. Army upstream vortex shedding walls wind speed