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Noise HealthSome of the next articles are maybe not open access.
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Self active cancellation of fan noise
International Journal of Aeroacoustics, 2022Reduction of fan noise is an important problem in the successful deployment of drones and UAV's. This paper considers a new approach to reducing fan and propeller noise based upon micro vibrations of the propeller blades around their axis of support ...
C. Fuller
semanticscholar +1 more source
Design of a single degree of freedom acoustic liner for a fan noise test rig
International Journal of Aeroacoustics, 2021Acoustic liners are an essential part of noise reduction technologies commonly applied in aircraft turbofan engines. Fan noise suppression can be achieved by selecting an appropriate liner design with optimal acoustic impedance at the blade passing ...
A. Spillere +8 more
semanticscholar +1 more source
Permeable Leading Edges for Airfoil and Fan Noise Reduction in Disturbed Inflow
AIAA Journal, 2021A detailed experimental study on the aerodynamic performance and noise emission of airfoils and fan blades with permeable leading edges under disturbed inflow conditions was performed.
Christof Ocker +6 more
semanticscholar +1 more source
Journal of the Acoustical Society of America, 2020
In this paper, a concept about the aeroengine fan health monitoring approach is proposed based on the compressive-sensing-based acoustic mode detection method. Utilizing only a few acoustic sensors, possible accidents inducing the change of the fan noise
Huanxian Bu, Xun Huang, Xin Zhang
semanticscholar +1 more source
In this paper, a concept about the aeroengine fan health monitoring approach is proposed based on the compressive-sensing-based acoustic mode detection method. Utilizing only a few acoustic sensors, possible accidents inducing the change of the fan noise
Huanxian Bu, Xun Huang, Xin Zhang
semanticscholar +1 more source
Journal of Sound and Vibration, 1971
Abstract Helicopter rotor noise theories are used to determine the noise of subsonic fans produced solely by the rotor, which results from aerodynamic intake flow distortions. Extensions to the theories allow for both stationary, phase-related distortions and distortions which vary randomly with time and may therefore be considered to rotate with ...
B. Barry, C.J. Moore
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Abstract Helicopter rotor noise theories are used to determine the noise of subsonic fans produced solely by the rotor, which results from aerodynamic intake flow distortions. Extensions to the theories allow for both stationary, phase-related distortions and distortions which vary randomly with time and may therefore be considered to rotate with ...
B. Barry, C.J. Moore
openaire +1 more source
The Journal of the Acoustical Society of America, 1953
Using the apparatus described by Reynolds, Wilson, and Beranek, measurements were made of the acoustic power in watts in twenty-four bands each one-third octave wide for three vaneaxial-type and two centrifugal-type fans of grades sizes. Formulas were derived empirically, enabling the computation of the over-all acoustic power of the noise for the ...
C. E. Peistrup, J. E. Wesler
+4 more sources
Using the apparatus described by Reynolds, Wilson, and Beranek, measurements were made of the acoustic power in watts in twenty-four bands each one-third octave wide for three vaneaxial-type and two centrifugal-type fans of grades sizes. Formulas were derived empirically, enabling the computation of the over-all acoustic power of the noise for the ...
C. E. Peistrup, J. E. Wesler
+4 more sources
A Time-Domain Reconfigurable Second-Order Noise Shaping ADC With Single Fan-Out Gated Delay Cells
IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2023This brief proposes a time-domain second-order noise shaping analog-to-digital converter (ADC). It employs a voltage-to-time converter (VTC) in tandem with a second-order noise shaping time-to-digital converter (TDC), which realizes the goal of reducing ...
Zhe Yu +6 more
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The Physics of Fluids, 2023
This research was inspired by the long-eared owl's ability to fly silently. For the first time in this study, a wind turbine blade is designed to mimic the wing surface and the leading edge of the long-eared owl.
Jian Lei, Qin Cui, Guoliang Qin
semanticscholar +1 more source
This research was inspired by the long-eared owl's ability to fly silently. For the first time in this study, a wind turbine blade is designed to mimic the wing surface and the leading edge of the long-eared owl.
Jian Lei, Qin Cui, Guoliang Qin
semanticscholar +1 more source