Results 221 to 230 of about 37,579 (262)

Low noise fan

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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Fan and compressor noise attenuation

The Journal of the Acoustical Society of America, 2010
The present invention is a noise attenuation system (40) and related method for suppressing noise having a primary tone generated by a jet engine (20). An exciting sound wave generator (40) is positioned within the nacelle (22) of the jet engine at its inlet (26) to generate an exciting sound wave having a primary frequency generally different from a ...
Man-Chun Tse, André LeBlanc
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Characterizing computer cooling fan noise

The Journal of the Acoustical Society of America, 2003
Computer 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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Prediction of fan broadband noise

4th AIAA/CEAS Aeroacoustics Conference, 1998
The objective of the present work is to develop a complete theory of fan broadband noise in UHBR engines. This paper focuses on dipole broadband noise sources, resulting from the interaction of turbulent inflows with the fan rotor. A modal expansion in a hard-walled duct is used to evaluate the sound power radiated from the sources, taking into account
Benoit d, Michel Roger, Jean Cailleau
openaire   +1 more source

Measurement of the Noise of Ducted Fans

The Journal of the Acoustical Society of America, 1956
A proposed technique for measuring the noise of a ducted fan by means of a microphone placed inside the fan duct was evaluated by comparing results so obtained with those obtained by measuring the total sound energy radiated from the duct into a reverberation chamber. A suitable microphone windscreen was developed and was used to reduce the aerodynamic
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Quadrupole noise simulation for fan noise prediction

2007
NA
Ghorbaniasl, Ghader, Hirsch, Charles, Lacor, Christian   +2 more
openaire   +1 more source

An Overview of Testing Methods for Aeroengine Fan Noise

Progress in Aerospace Sciences, 2021
Xin Zhang, Xun Huang
exaly  

Small Samples Noise Prediction of Train Electric Traction System Fan Based on a Multiple Regression-Fuzzy Neural Network

Engineering Applications of Artificial Intelligence, 2023
Rongjun Ding
exaly  

Fan noise

2017
Stewart Glegg, William Devenport
openaire   +1 more source

Fan Noise and Control: Effect of Forward Motion on Fan Noise

1976
openaire   +2 more sources