Results 221 to 230 of about 36,432 (262)
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Prediction of fan broadband noise
4th AIAA/CEAS Aeroacoustics Conference, 1998The 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
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Journal of Thermal Science, 2008
In the wake-rotor interaction fan noise, a number of the interacting modes at the blade passing frequency (BPF) and its harmonics are generated which are prescribed by the number of stator and rotor blades etc. In the present study, the dominant mode is tried to be suppressed by the secondary sound from the loudspeaker actuators.
Nobuhiko Yamasaki, Hirotoshi Tajima
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In the wake-rotor interaction fan noise, a number of the interacting modes at the blade passing frequency (BPF) and its harmonics are generated which are prescribed by the number of stator and rotor blades etc. In the present study, the dominant mode is tried to be suppressed by the secondary sound from the loudspeaker actuators.
Nobuhiko Yamasaki, Hirotoshi Tajima
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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
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Acoustic noise control for fans
The Journal of the Acoustical Society of America, 1989Apparatus 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.
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Measurement of the Noise of Ducted Fans
The Journal of the Acoustical Society of America, 1956A 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
2007NA
Ghorbaniasl, Ghader +2 more
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An overview of testing methods for aeroengine fan noise
Progress in Aerospace Sciences, 2021Xin Zhang, Xun Huang
exaly