Acoustics Technology: A Survey
" ... This survey is one of a series of NASA publications that include information of interest to the non-aerospace community. In this survey, the major revival and expansion of acoustic technology that took place in the middle of this century has been reviewed. ... The information in this document is based on a comprehensive examination of the literature available on the subject. The reference material is concerned primarily with investigations of the mechanisms by which noise is generated, the propagation of noise by spacecraft boosters, the origin of noise generated by compressors in aircraft turbojet engines, and the subjective effects of noise on humans. Because many of these investigations are still in progress, the extent to which they are treated is limited in some cases. It is hoped, however, that the information presented here will stimulate interest in acoustics and the control of noise, and will guide interested persons to sources of specific information in the literature presently available."--Foreword.
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NOISE GENERATION _
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acoustic Acoustic resonances aircraft engine analysis analyzed area-rule atmosphere axial-flow compressors basic boosters boundary-layer calculated chamber characteristics combustion complex compressor noise conventional determine developed diameter discussed effects energy evaluation exhaust experiment experimental far-field fatigue flight fluid frequency range increase indicated intensity investigated jet noise Langley Research Center Lewis Research Center liquid loudness low-frequency noise Mach number Mach waves measurements mechanical method microphones NASA TN near-field noise level noise measurements noise reduction noisiness nozzle obtained octave band operating output overpressure panel pattern phenomena predicted pressure fluctuations problems produced propagation quency radiation ratio reduced Research Center resonance rocket rotor shape shock waves simulate sonic boom sound fields sound levels sound pressure levels sound velocity sound waves space spacecraft spectra spectrum speed spinor structures subsonic suppressor technique temperature theory tion transducer transmission tube tunnel turbojet vehicle velocity vibration viscoelastic wind