Results 261 to 270 of about 11,859 (310)

On Noise of Aerodynamic Origin

The Journal of the Acoustical Society of America, 1953
An attempt is made in this paper to classify noises of various aerodynamic origin by means of an efficiency of conversion from mechanical to acoustical energy, and also by means of representative spectra associated with corresponding characteristic frequencies.
Osman K. Mawardi, Ira Dyer
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Aerodynamic Noise

The Journal of the Royal Aeronautical Society, 1954
The heading aerodynamic noise includes all cases where sound is generated by fluid flows. It includes aeolian harps, edge tones and related phenomena as well as vortex, boundary layer, wake and jet noise. In the strict sense it does not include propeller noise and the direct noise generated by; bodies in motion.
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On the Aerodynamic Noise of a Turbulent Jet

Journal of the Aerospace Sciences, 1961
Summary A new model is advanced for analyzing the broad-spectrum noise of a turbulent jet. The shear layer bounding the turbulent jet is assumed to play an important role in modifying the "quadrupole sound radiation" from the interior. To the sound-emit­ ting, small-scale turbulent eddies (with frequencies much higher than those of large-scale eddies),
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Automobile Aerodynamic Noise

SAE Technical Paper Series, 1990
<div class="htmlview paragraph">As engine, tire, and other automobile noise is reduced and as driving speeds increase, aerodynamic noise sources on ground vehicles are becoming relatively more important. They often dominate at cruise speeds above 60 mph. Aspiration and leak noise are strong sources but generally can be controlled by known methods.
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The Source of Aerodynamic Noise

International Journal of Aeroacoustics, 2003
This paper is a tribute to Alan Powell's achievements and his extensive publications in hydro and aeroacoustics. 1 The theory of Aerodynamic Noise was established by Sir James Lighthill in 1952.
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Aerodynamic Noise of Ground Vehicles

SAE Technical Paper Series, 1991
<div class="htmlview paragraph">As engine, tire, and other automobile noise is reduced and as driving speeds increase, aerodynamic noise sources on ground vehicles are becoming relatively more important. They often dominate at cruise speeds of 65 mph.
Albert R. George, John R. Callister
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AERODYNAMIC NOISE: A CRITICAL SURVEY

Journal of Sound and Vibration, 2000
Annoyance due to railway noise is a particularly sensitive aspect of new high-speed projects. Many studies have shown that aerodynamic noise becomes significant above 300 km/h and can become predominant with the reduction of the contribution of rolling noise.
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COMPUTING AERODYNAMICALLY GENERATED NOISE

Annual Review of Fluid Mechanics, 1997
▪ Abstract  In contrast to computational aerodynamics, which has advanced to a fairly mature state, computational aeroacoustics (CAA) has only recently emerged as a separate area of study. Following a discussion of the classical field of aeroacoustics as introduced by Lighthill, the paper provides an overview and analysis of the problems associated ...
Valana L. Wells, Rosemary A. Renaut
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Generalized aerodynamic noise equation

The Physics of Fluids, 1975
An exact aerodynamic noise equation is formulated for Newtonian fluids. The cause−effect problem is discussed. Finally, the importance of external additions of mass, momentum, and energy is examined.
Chandraker, AL, Munjal, ML
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Circular saw aerodynamic noise

Journal of Sound and Vibration, 1992
Summary: The aerodynamically induced noise of an idling circular saw turning at high speed is investigated both experimentally and analytically. The origin of the noise is shown to be fluctuating lift forces acting on the teeth. The sources at the teeth radiate incoherently as baffled dipoles and account for the generated noise.
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