Results 161 to 170 of about 11,915 (202)
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Aeroacoustic instability in rockets
37th Joint Propulsion Conference and Exhibit, 2001Current solid-propellant rocket instability calculations (e.g., Standard Stability Prediction Program ) account only for the evolution of acoustic energy with time. However, the acoustic component represents only part of the total unsteady system energy; additional kinetic energy resides in the shear waves that naturally accompany the ...
Gary A. Flandro, Joseph Majdalani
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Aeroacoustics of Musical Instruments
Annual Review of Fluid Mechanics, 2012We are interested in the quality of sound produced by musical instruments and their playability. In wind instruments, a hydrodynamic source of sound is coupled to an acoustic resonator. Linear acoustics can predict the pitch of an instrument. This can significantly reduce the trial-and-error process in the design of a new instrument.
Fabre, Benoît +3 more
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Advances in Experimental Aeroacoustics
International Journal of Aeroacoustics, 2013A review of modern experimental methods in aeroacoustics is provided along with sample applications. Specific emphasis has been placed on four advanced experimental techniques: (i) beamforming, (ii) acoustic holography, (iii) phase averaging and simultaneous flow/acoustic measurements and (iv) higher order spectral analysis.
Ganesh Raman +3 more
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Acoustics, Aeroacoustics and Vibrations
2016This didactic book presents the main elements of acoustics, aeroacoustics and vibrations.Illustrated with numerous concrete examples linked to solid and fluid continua, Acoustics, Aeroacoustics and Vibrations proposes a selection of applications encountered in the three fields, whether in room acoustics, transport, energy production systems or ...
Anselmet, Fabien, Mattei, Pierre-Olivier
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Identifying Aeroacoustic Sources
13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference), 2007This paper reconsiders the basic manner in which the aeroacoustic equations have been derived, and proposes an alternative formulation in which we endeavor to separate ’hydrodynamic’ and ’acoustic’ terms, which we treat as synonymous with ‘radiating’ and ‘non-radiating’ mechanisms.
William George +2 more
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Journal of Fluid Mechanics, 2002
A systematic study has been undertaken to quantify the effect of jet temperature on the noise radiated by subsonic jets. Nozzles of different diameters were tested to uncover the effects of Reynolds number. All the tests were carried out at Boeing's Low Speed Aeroacoustic Facility, with simultaneous measurement of thrust and noise. It is concluded that
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A systematic study has been undertaken to quantify the effect of jet temperature on the noise radiated by subsonic jets. Nozzles of different diameters were tested to uncover the effects of Reynolds number. All the tests were carried out at Boeing's Low Speed Aeroacoustic Facility, with simultaneous measurement of thrust and noise. It is concluded that
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Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2004
The theory of the sibilant fricative [s] is formulated and solved as a mathematical problem of aeroacoustics. Air is forced through the constriction between the tongue blade and the hard palate by intra-oral pressure, forming a jet that strikes the upper incisors and leaves the mouth through a gap between the upper and lower incisors.
Michael S. Howe, Richard S. McGowan
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The theory of the sibilant fricative [s] is formulated and solved as a mathematical problem of aeroacoustics. Air is forced through the constriction between the tongue blade and the hard palate by intra-oral pressure, forming a jet that strikes the upper incisors and leaves the mouth through a gap between the upper and lower incisors.
Michael S. Howe, Richard S. McGowan
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2012
Computational aeroacoustics (CAA) is a relatively new research area. CAA algorithms have developed rapidly and the methods have been applied in many areas of aeroacoustics. The objective of CAA is not simply to develop computational methods but also to use these methods to solve practical aeroacoustics problems and to perform numerical simulation of ...
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Computational aeroacoustics (CAA) is a relatively new research area. CAA algorithms have developed rapidly and the methods have been applied in many areas of aeroacoustics. The objective of CAA is not simply to develop computational methods but also to use these methods to solve practical aeroacoustics problems and to perform numerical simulation of ...
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The Journal of the Acoustical Society of America, 2002
Several commercial options exist for prevention of the pseudo-sound often introduced by a microphone in the presence of a flow field. One such device is a so-called ‘‘slit-tube.’’ A slit-tube is a tube approximately the diameter of the microphone with which it is used.
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Several commercial options exist for prevention of the pseudo-sound often introduced by a microphone in the presence of a flow field. One such device is a so-called ‘‘slit-tube.’’ A slit-tube is a tube approximately the diameter of the microphone with which it is used.
openaire +1 more source