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The Characterization Of Military Aircraft Jet Noise Using Near-Field Acoustical Holography Methods, Alan Thomas Wall
The Characterization Of Military Aircraft Jet Noise Using Near-Field Acoustical Holography Methods, Alan Thomas Wall
Theses and Dissertations
The noise emissions of jets from full-scale engines installed on military aircraft pose a significant hearing loss risk to military personnel. Noise reduction technologies and the development of operational procedures that minimize noise exposure to personnel are enhanced by the accurate characterization of noise sources within a jet. Hence, more than six decades of research have gone into jet noise measurement and prediction. In the past decade, the noise-source visualization tool near-field acoustical holography (NAH) has been applied to jets. NAH fits a weighted set of expansion wave functions, typically planar, cylindrical, or spherical, to measured sound pressures in the …