Results 221 to 230 of about 35,280 (262)

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

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
openaire   +1 more source

Acoustic noise control for fans

The Journal of the Acoustical Society of America, 1989
Apparatus for the abatement of noise from cooling fans primarily in computer and business equipment. Noise of mechanical origin is reduced by damping the fan casing, by mass-loading the casing (at low frequencies), by isolating the casing from its surrounds, and by absorbing some of the noise as it is radiated from the fan casing.
openaire   +1 more source

Quadrupole noise simulation for fan noise prediction

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

An overview of testing methods for aeroengine fan noise

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

Prediction of fan acoustic blockage on fan/outlet guide vane broadband interaction noise using frequency domain linearised Navier–Stokes solvers

Journal of Sound and Vibration, 2021
Ricardo Blazquez Navarro, Roque Corral Garcia   +1 more
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

Inflow effects on tonal noise of axial fan under system resistances

Applied Acoustics, 2022
Minjun Park
exaly