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Absorption Measurement 1122 74 160
Absorption Theory 2936 212 265
Anechoic Chambers Quiet Rooms Etc 4951 364 380
36 other sections not shown
1nst absorption coefficient absorption of sound aircraft altitude amplitude analysis analyzed approximately array atmosphere Atmospheric Acoustic attenuation boundary boundary layer calculated characteristics correlation curves density described determined developed diffraction discussed dispersion distance effects energy engine English Transl equations experimental flow fluctuations frequency function gases given gradient heat heat conduction horn intensity investigated layer loudspeaker Mach number measurements medium meteorological method microphone Missile obtained output phase plane wave presented problem propagation of sound pulse quency radiation radiation pressure range ratio reflection refraction relaxation resonator reverberation rocket scattering shadow zone shock tube shock wave shown signal sonic sound absorption sound field sound pressure sound pressure levels sound propagation sound source sound waves Soviet Phys spectra spectrum speed supersonic surface Tech techniques theoretical theory tion transducer transmission turbulence ultrasonic Univ values variation velocity of sound vibration viscosity wavelength