Results 31 to 40 of about 1,595,600 (284)
Noise Prediction of Centrifugal Fan Based on Improved Nenral Network [PDF]
E3S Web of Conferences, 2021 In order to solve the problems that the prediction accuracy of the traditional centrifugal fan is low and the cost is high, a noise prediction model for centrifugal fan based on improved particle swarm optimization (IPSO) optimized BP neural network was ...
Long Bo +3 more
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Main fan noise mitigation technologies in turbofan engines
Aviation, 2014 Aircraft noise and emissions have been of concern since the beginning of commercial aviation. The continuing growth in air traffic and increasing public awareness have made environmental considerations one of the most critical aspects of commercial ...
Fathollah Ommi, Mohammadreza Azimi
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Aerodynamic and aeroacoustic properties of axial fan blades with slitted leading edges
Acta Acustica, 2022 A detailed experimental analysis of the aerodynamic and aeroacoustic properties of flat-plate axial fans with slitted leading edges is performed. The sound emissions of five slitted leading edge designs are measured at a constant rotational speed and at ...
Ocker Christof +4 more
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The Journal of the Acoustical Society of America, 1959 Many of the phenomena of noise of fans can be predicted from the simple assumption that the source of noise power is a pressure pulse created by the motion of the blade or impellor. From this assumption the well known fan sound laws can be derived: (1) the sound power varies as the fifth power of the blade tip speed, and (2) the sound power is ...
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Noise-Source Identification for Ducted Fan Systems [PDF]
AIAA Journal, 2007 Coherence-based source analysis techniques can be used to identify the contribution of combustion noise in the exhaust of a jet engine and to hence enable the design of noise-reduction devices. However, when the combustion noise propagates in a nonlinear fashion, the identified contribution using ordinary coherence methods will be inaccurate.
BENNETT, GARETH, FITZPATRICK, JOHN AIDAN
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Utjecaj radijalnog i aksijalnog razrmaka na emitiranu buku i performance ventilatora
Promet (Zagreb), 2012 Among all auxilimy units of the air cooled diesel engine acooling fan is the noisiest. One of the noise generation mechanismsis the blade interaction with the vortices occurring in theradial and axial clearances of the fan due to the pressure ...
Mirko Čudina
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Numerical assessment of fan blades screen effect on fan/OGV interaction tonal noise [PDF]
, 2020 This work deals with sound generation and transmission in a fan stage. The study is done on a subsonic Fan stage and interaction noise between the fan wakes and the Outlet Guide Vanes (OGV) is considered. For this purpose, the Linearized Euler Equations (
DELIGANT, Michael +5 more
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Application of Wake Characteristics to Prediction of Broadband Noise of a Multiblade Fan
Journal of Fluid Science and Technology, 2008 In this study, the wake characteristics of an arc blade were measured by the wind tunnel experiment; the characteristics were defined as the width of the wake, diameter of the vortex, ratio of the vortex scale, and the local lift.
Soichi SASAKI, Hidechito HAYASHI
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FEBS Open Bio, EarlyView.Time‐resolved X‐ray solution scattering captures how proteins change shape in real time under near‐native conditions. This article presents a practical workflow for light‐triggered TR‐XSS experiments, from data collection to structural refinement. Using a calcium‐transporting membrane protein as an example, the approach can be broadly applied to study ...
Fatemeh Sabzian‐Molaei +3 more
wiley +1 more source
Aerodynamic noise characteristics of a centrifugal fan in high-altitude environments.
PLoS ONEIn high-altitude areas, the air is thin and the atmospheric pressure is low, which can affect the performance of centrifugal fans and aerodynamic noise.
Xue Liu, Jian Liu
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