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How to reduce fan noise in amplifier? 

Aerodynamics
Bypass ratio
Noise
Impeller
Centrifugal fan

Answers from top 10 papers

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Papers (10)Insight
Proceedings Article•DOI
Broadband Liner Optimization for the Source Diagnostic Test Fan
Douglas M. Nark, Michael G. Jones 
18 May 2012
19 Citations
Thus, while the attenuation of fan tones remains paramount, the ability to simultaneously reduce broadband fan noise levels has become more attractive.
Journal Article•DOI
Numerical investigation of blade tip grooving effect on performance and dynamics of an axial flow fan
Xuemin Ye, Pengmin Li, Chunxi Li, Xueliang Ding 
15 Mar 2015-Energy
52 Citations
Grooved blade tips amplify the fan noise, so measures should be taken to control the noise.
Journal Article•DOI
High frequency noise generation in small axial flow fans
D.A. Quinlan, P.H. Bent 
26 Nov 1998-Journal of Sound and Vibration
39 Citations
The data presented indicates that this turbulence is the dominant source of noise above 1.5 kHz for the fan tested.
Journal Article•DOI
Experimental Study on the Aeroacoustic Behavior of a Forward-Curved Blades Centrifugal Fan
Sandra Velarde-Suárez, Carlos Santolaria-Morros, Rafael Ballesteros-Tajadura 
01 Jun 1999-Journal of Fluids Engineering-transactions of The Asme
27 Citations
Although the main contribution to fan noise generation is due to mechanical sources, the bands in which aerodynamic noise is generated by these fans correspond to frequencies especially unpleasant to the human earl Therefore, the research presented in this paper may be of considerable interest, establishing a starting point for the design of quieter and more efficient fans.
Proceedings Article•DOI
Development and application of a new procedure for fan noise prediction
Antoine Moreau, Sebastien Guerin 
07 Jun 2010
15 Citations
Furthermore the acoustic output at the presence of parameter variations provides guidelines for the design-to-noise of fan components.
Journal Article•DOI
An industrial onsite methodology for combined acoustic-aerodynamic diagnostics of axial fans, involving the phased array microphone technique
Tamás Benedek, János Vad 
01 Mar 2016-International Journal of Aeroacoustics
17 Citations
Such correlations may contribute to redesign guidelines for simultaneous reduction of noise and improvement of efficiency at prescribed fan performance.
Journal Article•DOI
Generation Mechanisms of Low-Frequency Centrifugal Fan Noise
K.-R. Fehse, Wolfgang Neise 
01 Jan 1999-AIAA Journal
22 Citations
The flow in the fan casing also contributes to the low frequency noise: Here the flow along those parts of the volute is important which is close to the impeller periphery, specifically the cut-off area.
Journal Article•DOI
Improving active control of fan noise with automatic spectral reshaping for reference signal
Kai Chen, Kai Chen, Roshun Paurobally, Roshun Paurobally, Jie Pan, Jie Pan, Xiaojun Qiu, Xiaojun Qiu 
01 Jan 2015-Applied Acoustics
20 Citations
In this paper, an improved algorithm for active control of fan noise is proposed.
Journal Article•DOI
The noise of cooling fans used in heavy automotive vehicles
B.D. Mugridge
08 Feb 1976-Journal of Sound and Vibration
18 Citations
The results indicate the limits of maximum noise reduction which manufacturers may expect using existing fan designs and also indicates the methods for achieving maximum noise reduction for these configurations.
Journal Article•DOI
Numerical calculation of centrifugal fan noise
Q Liu, Datong Qi, Yijun Mao 
01 Aug 2006
54 Citations
The method described and applied in this work provides a good qualitative prediction of the noise generation when designing a new fan, thus facilitating the choice of the lowest noise fan from several feasible alternatives.

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