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Modelling jet noise reduction : chevrons and microjetsDepuru Mohan, Nagendra Karthik January 2014 (has links)
No description available.
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Sound generation from coherent structures in subsonic jetsBin Baqui, Yamin January 2015 (has links)
No description available.
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The interactions of two perturbed vortex rings鄧志剛, Tang, Chi-kong, Clief. January 2000 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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A boundary value problem related to the radiation of sound from a supersonic jetIngle, Richard Maurice 12 1900 (has links)
No description available.
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Experimental investigations of on-axis discrete frequency fan noise.Leggat, Lennox John January 1973 (has links)
The thesis describes experimental techniques used and results obtained in the investigation of the pure tone components of sound radiation from a commercial 19 inch axial flow fan. The causes and extent of the discrete tone sources were investigated by several methods: cross-correlation of fan surface pressure fluctuations with far field sound, spectral analysis of surface pressure, and examination of surface pressure waveforms. A unique feature involved the design of an apparatus for detecting and transmitting fan-borne pressure fluctuations off the rotating blades.
"Causality Correlations" with the on-axis far field sound rendered dipole source strength distribution functions over a span wise line at 15 per cent chord from the leading edge of the fan blade and around a circumferential ring on the motor support strut at a fan radius of 89 per cent.
Results indicate that the on-axis discrete tones are a result of source mechanisms causing force fluctuations on the blades and struts which in turn lead to sound radiation which is dipole in nature and is most intense on the axis of the fan. These mechanisms include ingestion of a concentrated vortex, modulation of the clearance between the blade tips and the fan shroud, flow separation around the inlet bell mouth, and fluctuations in the inflow velocity due to the proximity of the fan to the wedged wall of the Anechoic chamber. Crude integral approximations of source strength distributions over the surfaces of the blades and the struts indicated that sound radiation at the blade passage frequency from these two contributors to the overall sound would be about equal, although more sound radiation is expected to originate at the rotor. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate
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A low-frequency instability mechanism in a coaxial dump combustorKeklak, John Adam January 1982 (has links)
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by John Adam Keklak. / M.S.
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Preprocessing issues in high resolution radar target classificationZyweck, Anthony. January 1995 (has links) (PDF)
Bibliography: leaves 287-294. This thesis addresses preprocessing issues for radar target classification from high resolution radar imagery. High resolution radar imagery of real aircraft in flight and of a MIRAGE aircraft on a turntable is examined. An algorithm to coherently average high resolution range profile is proposed.
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Jet noise of high aspect-ratio rectangular nozzles with application to pneumatic high-lift devicesMunro, Scott Edward 12 1900 (has links)
No description available.
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Preprocessing issues in high resolution radar target classification / by Anthony Zyweck.Zyweck, Anthony January 1995 (has links)
Bibliography: leaves 287-294. / xviii, 294 p. : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis addresses preprocessing issues for radar target classification from high resolution radar imagery. High resolution radar imagery of real aircraft in flight and of a MIRAGE aircraft on a turntable is examined. An algorithm to coherently average high resolution range profile is proposed. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 1995
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An experimental and analytical study of noise production and propagation in burnersJones, James D. January 1982 (has links)
Turbulent combustion in burners causes low frequency broadband combustion noise. Before the noise from such burners can be reduced, the generating mechanisms must be understood.
Noise generation by a simple can-type burner has been investigated. Several parameters are varied to study their effect on the far-field noise spectrum. The noise characteristics of the burner observed in this work are generally similar to those updated in the literature.
A combustion noise data base is developed for use with an analytical model in isolating the acoustic source structure within the burner. The source distribution with frequency subject to an assumed spacial distribution is recovered from far-field acoustic pressure measurements used in conjunction with the analytical model for a limited number of the cases investigated experimentally. / Master of Science
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