Cooling fan noise reduction apparatus, systems, and methods

2008 ◽  
Vol 124 (4) ◽  
pp. 1900
Author(s):  
Eric Baugh
Keyword(s):  
Noise Reduction ◽  
Fan Noise ◽  
Cooling Fan

scholarly journals Study on Low-Noise Fan. Noise Reduction of Pusher-Type Condenser Cooling Fan.

1993 ◽  
Vol 59 (558) ◽  
pp. 453-459 ◽  
Author(s):  
Kiyoshi Kawaguchi ◽  
Shigeru Kadota ◽  
Masahiko Suzuki ◽  
Kazuma Matsui ◽  
Koji Kikuyama
Keyword(s):  
Noise Reduction ◽  
Low Noise ◽  
Fan Noise ◽  
Cooling Fan

325 Fan Noise Reduction for Induction Motors : Utilization of the cooling fan using blades with irregular pitches

2007 ◽  
Vol 2007 (0) ◽  
pp. _325-1_-_325-6_
Author(s):  
Sueyoshi MIZUNO ◽  
Shinichi NODA ◽  
Yoshitaka KOBAYASHI
Keyword(s):  
Noise Reduction ◽  
Induction Motors ◽  
Fan Noise ◽  
Cooling Fan

Development of an Ultra-Quiet Fan for Computer Cooling Applications

2014 ◽  
Author(s):  
Zhenyu Wang ◽  
Hui Hu
Keyword(s):  
Flow Field ◽  
Noise Reduction ◽  
Sound Pressure ◽  
Field Measurements ◽  
Vortex Structures ◽  
Tip Clearance ◽  
Axial Fan ◽  
Fan Noise ◽  
Piv Measurements ◽  
Cooling Fan

We report the progress made in our recent study to develop an ultra-quiet axial fan for computer cooling applications. By using a commercially-available cooling fan as the baseline, a number of acoustically tailored modifications are implemented in order to reduce the noise level of the cooling fan, which includes optimizing the rotator blades and guide vanes according to axial fan design theory, adding an intake cone in the front of the hub to guide the airflow into the axial fan smoothly, and reducing the tip clearance to lower the noise generation due to tip vortex structures. A comparison study is conducted to measure the sound pressure level (SPL) of the reformed axial fan in an anechoic chamber, in comparison to that of the prototype fan, in order to assess the effects of the modifications on the fan noise reduction. The measurement results of our preliminary study reveal that, at the same flow rate, the SPL of the reformed fan would be up to 5 dB lower than that of the prototype fan. In addition to measuring the sound pressure levels (SPLs) of the fans, a digital particle image velocimetry (PIV) system is also used to conduct detailed flow field measurements to reveal the changes of the flow characteristics and unsteady vortex structures associated with the modifications. Besides conducting “free-run” PIV measurements to determine the ensemble-averaged statistics of the flow quantities such as mean velocity, Reynolds stress, and turbulence kinetic energy (TKE) distributions at the exit of the axial fan, “phase-locked” PIV measurements are also performed to elucidate further details about evolution of the unsteady vortex structures in fan exhaust in relation to the position of the rotating fan blades. The detailed flow field measurements are correlated with the SPL measurements in order to elucidate underlying physics associated with the fan noise reduction.

An Experimental and Computational Study on the Aerodynamic and Acoustic Characteristics of Case Fans

2015 ◽  
Author(s):  
Zhenyu Wang ◽  
Hui Hu
Keyword(s):  
Flow Field ◽  
Noise Reduction ◽  
Sound Pressure ◽  
Numerical Study ◽  
Field Measurements ◽  
Vortex Structures ◽  
Tip Clearance ◽  
Axial Fan ◽  
Fan Noise ◽  
Cooling Fan

We report the progress made in our recent study to develop an ultra-quiet axial fan for computer cooling applications. By using a commercially-available cooling fan as the baseline, a number of acoustically tailored modifications are implemented in order to reduce the noise level of the cooling fan, which includes optimizing the rotating blades and guide vanes according to axial fan design theory, adding an intake cone in the front of the hub to guide the airflow into the axial fan smoothly, and reducing the tip clearance to lower the noise generation due to tip vortex structures. A comparison study is conducted to measure the sound pressure level (SPL) of the new-design axial fan in an anechoic chamber, in comparison to that of the baseline fan, in order to assess the effects of the modifications on the fan noise reduction. The measurement results of our study reveal that, at the same flow rate, the SPL of the new-design fan would be up to 5 dB lower than that of the baseline fan. In addition to measuring the sound pressure levels (SPLs) of the fans, a digital particle image velocimetry (PIV) system is also used to conduct detailed flow field measurements to reveal the changes of the flow characteristics and unsteady vortex structures associated with the modifications. “Time-averaged” PIV measurements illustrate the ensemble-averaged statistics of the flow quantities such as mean velocity, Reynolds stress, and turbulence kinetic energy (TKE) distributions at the flow field around the axial fan. Moreover, a numerical study of the new-design fan is also performed and which is aimed to investigate the flow details inside of the fan. The validation comparison between numerical results and experimental results agree very well and that gives the strong confidence for the computational flow field in the fan can be regarded as useful complement for experiments. The detailed flow field measurements are correlated with the SPL measurements in order to elucidate underlying physics associated with the fan noise reduction.

Design and application of a perforated panel system to a household refrigerator for cooling fan noise reduction

2011 ◽  
Vol 226 (3) ◽  
pp. 785-797 ◽  
Author(s):  
J-Y Seo ◽  
W-J Kim ◽  
J-S Won
Keyword(s):  
Experimental Study ◽  
Noise Reduction ◽  
Feasible Solution ◽  
Acoustic Absorption ◽  
Fan Noise ◽  
New Approach ◽  
Cooling Performance ◽  
Reduction Strategy ◽  
Cooling Fan ◽  
Novel Method

This article presents a new approach to reduce cooling fan noise of a household refrigerator. A noise reduction strategy employing a perforated panel system is suggested, and the design of the perforated panel system is optimized via experimental analyses. Degradation of cooling performance owing to the introduction of the perforated panel system is addressed and a novel method to guarantee overall acoustic absorption and cooling performance is proposed. Experimental study is conducted to design and evaluate the proposed system as a feasible solution for noise reduction.

Application of acoustic analogy to automotive engine-cooling fan noise prediction

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 1095-1098 ◽  
Author(s):  
Jeonghan Lee ◽  
Kyungseok Cho ◽  
Soogab Lee
Keyword(s):  
Noise Prediction ◽  
Acoustic Analogy ◽  
Fan Noise ◽  
Automotive Engine ◽  
Engine Cooling ◽  
Cooling Fan
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