Results 281 to 290 of about 5,629,785 (335)
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Journal of the Acoustical Society of America, 2019
In a previous study by the authors, two indices were identified as appropriate descriptors for perceptual dimensions of fan noise. The index Nlow describes the amount of low-frequency loudness relative to the overall loudness. The index Nratio represents
Stephan Töpken, S. van de Par
semanticscholar +1 more source
In a previous study by the authors, two indices were identified as appropriate descriptors for perceptual dimensions of fan noise. The index Nlow describes the amount of low-frequency loudness relative to the overall loudness. The index Nratio represents
Stephan Töpken, S. van de Par
semanticscholar +1 more source
Wind-Tunnel Investigation on the Compressive-Sensing Technique for Aeroengine Fan Noise Detection
AIAA Journal, 2018In previous work, a new compressive-sensing-based method for ducted aeroengine fan noise tests was proposed.
Huanxian Bu +3 more
semanticscholar +1 more source
Computational chain for virtual fly-over simulations applied to fan noise
Advanced Courses, 2018To ensure an aircraft’s compliance with noise regulations, expensive fly-over tests are required. Up until now, there is no numerical alternative to the experimental Standard procedure.
Michael Moessner +3 more
semanticscholar +1 more source
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
semanticscholar +1 more source
The Journal of the Acoustical Society of America, 1993
A gas turbine engine rotor assembly such as a fan or compressor includes a plurality of rotor blades spaced axially from a plurality of stator vanes inside an annular duct. The number of vanes is selected for a predetermined number of blades for obtaining substantially equal values of a cut-off ratio for at least two blade passing frequency harmonics ...
Phillip R. Gliebe, Patrick Y. S. Ho
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A gas turbine engine rotor assembly such as a fan or compressor includes a plurality of rotor blades spaced axially from a plurality of stator vanes inside an annular duct. The number of vanes is selected for a predetermined number of blades for obtaining substantially equal values of a cut-off ratio for at least two blade passing frequency harmonics ...
Phillip R. Gliebe, Patrick Y. S. Ho
openaire +1 more source
Machine-Learning Clustering Methods Applied to Detection of Noise Sources in Low-Speed Axial Fan
Journal of Engineering For Gas Turbines and Power, 2022The integration of rotating machineries in human-populated environments requires to limit noise emissions, with multiple aspects impacting on control of amplitude and frequency of the acoustic signature. This is a key issue to address and when combined
L. Tieghi +5 more
semanticscholar +1 more source
The Journal of the Acoustical Society of America, 1995
An axial flow fan includes blades mounted on a hub and extending radially outward to a shroud disposed around the hub. Pairs of stators are connected to the shroud at positions angularly spaced about the inner periphery of the shroud. Each pair of stators includes a trailing stator angularly spaced from a leading stator by a distance related to the ...
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An axial flow fan includes blades mounted on a hub and extending radially outward to a shroud disposed around the hub. Pairs of stators are connected to the shroud at positions angularly spaced about the inner periphery of the shroud. Each pair of stators includes a trailing stator angularly spaced from a leading stator by a distance related to the ...
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Reduction of Ceiling Fan Noise by Serrated Trailing Edge
Fluctuation and Noise Letters, 2018Six ceiling fan blade models with different types of trailing edge serrations were created and were simulated using commercial software in the present studies in order to investigate the effectiveness of various trailing edge serrations in reducing fan ...
H. Lee, K. Lim, Heow Pueh Lee
semanticscholar +1 more source
Characterizing computer cooling fan noise
The Journal of the Acoustical Society of America, 2003Computer cooling fan noise is studied theoretically, focusing on the radiation from the interaction between rotor blades and motor struts. The source is decomposed into axial thrust, circumferential drag, and radial force. There is no sound-power coupling among the three components.
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Fan Compressor Noise Reduction
ASME 1969 Gas Turbine Conference and Products Show, 1969A study of various fan/compressor noise reduction methods is presented. The analytical treatment of the basic mechanisms of fan/compressor noise generation is described. The results are presented in parametric form and indicate the effects of fan/compressor design, number of blades, vane/blade ratio, aerodynamic parameters, and blade row spacing on ...
M. J. Benzakein, S. B. Kazin
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