Results 31 to 40 of about 5,629,785 (335)
Acoustics, 2020 A benchmark of Reynolds-Averaged Navier-Stokes (RANS)-informed analytical methods, which are attractive for predicting fan broadband noise, was conducted within the framework of the European project TurboNoiseBB.
Carolin Kissner +11 more
doaj +1 more source
Fan Noise Reduction: An Overview [PDF]
International Journal of Aeroacoustics, 2001 Fan noise reduction technologies developed as part of the Advanced Subsonic Technology Program are reviewed. Developments in low-noise fan stage design, swept and leaned outlet guide vanes, active noise control, fan wake management, and scarf inlets are discussed.
openaire +1 more source
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
doaj +1 more source
Time after time – circadian clocks through the lens of oscillator theory
FEBS Letters, EarlyView.Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo +2 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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Impact of the turbulence modeling approach on the accuracy of the fan noise level prediction
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018 The fan is the dominant source of noise for modern high bypass ratio aircraft engines. The article presents the results of investigating the influence of the approach to modeling the turbulence in modeling fan stage noise generation on the results of ...
K. R. Pyatunin, N. V. Arkharova
doaj +1 more source
Applied Sciences, 2020 Low-speed axial cooling fans are frequently used to manage engine temperature by ensuring that adequate quantities of air pass through heat exchangers, even at low vehicle speeds or in the idle condition. This study aims to provide a better understanding
Jang-oh Mo, Jae-hyuk Choi
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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
openaire +3 more sources
Aerodynamic noise prediction of a high-speed centrifugal fan considering impeller-eccentric effect
Engineering Applications of Computational Fluid Mechanics, 2022 In this paper, the aerodynamic noise of a centrifugal fan with an eccentric impeller is investigated and analyzed by adopting a hybrid method combining detached-eddy simulation and the acoustic finite element method (FEM).
Ke Ren +7 more
semanticscholar +1 more source
Optimizing Circular Side-Resonators to Reduce Computer Fan Noise [PDF]
, 2004 One of the main noise sources in computers are the cooling fans. Tonal noise at the rotational frequency of the fan, the blade passing frequency (BPF) and its higher harmonics are important in fan noise. So called 'side-resonators' integrated in the duct
Beltman, Willem M., Nijhof, Marten J.J.
core +1 more source