Results 181 to 190 of about 1,929,704 (249)
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, 2021
Today, the status of wildlife is extremely worrying because of noise pollution caused by aerodynamic noise of various industries. Circular cylinders are the most used devices in industries.
M. Souri, A. Mojra
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Today, the status of wildlife is extremely worrying because of noise pollution caused by aerodynamic noise of various industries. Circular cylinders are the most used devices in industries.
M. Souri, A. Mojra
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, 2021
The wall suction & slip effect of the bionic metasurface with periodic spherical grooves on the vehicle body surface is proposed for aerodynamic noise control, and physical mechanism is investigated by theoretical analysis and simulation.
Min Li, Jiuhui Wu, Xiaoyang Yuan
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The wall suction & slip effect of the bionic metasurface with periodic spherical grooves on the vehicle body surface is proposed for aerodynamic noise control, and physical mechanism is investigated by theoretical analysis and simulation.
Min Li, Jiuhui Wu, Xiaoyang Yuan
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Flow and aerodynamic noise control of a circular cylinder by local blowing
Journal of Fluid MechanicsIn this experimental study, the impact of symmetric local blowing on suppressing the vortex-induced noise of a circular cylinder was investigated. A highly instrumented cylinder with pressure taps and a series of blowing chambers was used to inject air ...
R. Maryami, E. Arcondoulis, Yu Liu
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Numerical study on the quadrupole sound source in aerodynamic noise of high-speed pantographs
International Journal of Rail transportationInsufficient consideration of aerodynamic noise source will affect the accurate evaluation of high-speed pantograph noise. In this study, we present an approach to separate and quantify the dipole and quadrupole noises of pantographs.
D. Qin, Tian Li, Ning Zhou, Ji-ye Zhang
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Aerodynamic Noise produced by a Gliding Owl
Nature, 1971THE flight of owls has been reported by ornithologists to be unusually quiet1. This conclusion is generally based on the success of the owl's hunting technique and on the relative inability of the observer to distinguish the owl aurally from other birds.
H D, Gruschka, I U, Borchers, J G, Coble
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The aerodynamic and noise characteristics of centrifugal fan with partially tilted tongue
The Physics of Fluids, 2023Tilted tongue is one of the very effective solutions to reduce the noise of centrifugal fans. In this study, the accuracy of the numerical simulations is verified by experimentally measured aerodynamic performance and acoustic spectra.
Ye Yuan +3 more
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On Noise of Aerodynamic Origin
The Journal of the Acoustical Society of America, 1953An 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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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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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, 1961Summary 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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The Physics of Fluids
The design of the cavity structure is one of the effective means to reduce the resistance and noise of the pantograph installed on the roof of a high-speed train. This research first investigated the flow and acoustic characteristics of a pantograph with
D. Qin, Tian Li, Ning Zhou, Ji-ye Zhang
semanticscholar +1 more source
The design of the cavity structure is one of the effective means to reduce the resistance and noise of the pantograph installed on the roof of a high-speed train. This research first investigated the flow and acoustic characteristics of a pantograph with
D. Qin, Tian Li, Ning Zhou, Ji-ye Zhang
semanticscholar +1 more source