Active control of centrifugal fan noise: Modeling design guidelines.

2011 ◽  
Vol 129 (4) ◽  
pp. 2584-2584 ◽  
Author(s):  
J. James Esplin ◽  
John K. Boyle ◽  
Scott D. Sommerfeldt ◽  
Kent L. Gee
Keyword(s):  
Active Control ◽  
Design Guidelines ◽  
Centrifugal Fan ◽  
Fan Noise ◽  
Noise Modeling

Active control of centrifugal fan noise: Modeling design guidelines

2011 ◽  
Author(s):  
J. James Esplin ◽  
John K. Boyle ◽  
Scott D. Sommerfeldt ◽  
Kent L. Gee
Keyword(s):  
Active Control ◽  
Design Guidelines ◽  
Centrifugal Fan ◽  
Fan Noise ◽  
Noise Modeling

scholarly journals Active control of axial and centrifugal fan noise

2013 ◽  
Author(s):  
Scott D. Sommerfeldt ◽  
Kent L. Gee
Keyword(s):  
Active Control ◽  
Centrifugal Fan ◽  
Fan Noise

Active control of axial and centrifugal fan noise

2013 ◽  
Vol 133 (5) ◽  
pp. 3264-3264
Author(s):  
Scott D. Sommerfeldt ◽  
Kent L. Gee
Keyword(s):  
Active Control ◽  
Centrifugal Fan ◽  
Fan Noise

Active control of centrifugal fan noise: Experimental results.

2011 ◽  
Vol 129 (4) ◽  
pp. 2584-2584 ◽  
Author(s):  
John K. Boyle ◽  
J. James Esplin ◽  
Scott D. Sommerfeldt ◽  
Kent L. Gee
Keyword(s):  
Active Control ◽  
Experimental Results ◽  
Centrifugal Fan ◽  
Fan Noise

Active control of fan noise

2008 ◽  
Vol 17 (2) ◽  
pp. 163-169 ◽  
Author(s):  
Nobuhiko Yamasaki ◽  
Hirotoshi Tajima
Keyword(s):  
Active Control ◽  
Fan Noise

Real-Time Tuning of Delayed Resonator-Based Absorbers for Spectral and Spatial Variations

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Ryan Jenkins ◽  
Nejat Olgac
Keyword(s):  
Real Time ◽  
Active Control ◽  
Design Guidelines ◽  
Spatial Variations ◽  
Time Varying ◽  
Vibration Absorption ◽  
Spatial Tuning ◽  
System Components ◽  
Hybrid Concept ◽  
Time Variations

This paper offers two interlinked contributions in the field of vibration absorption. The first involves an active tuning of an absorber for spectral and spatial variations. The second contribution is a set of generalized design guidelines for such absorber operations. “Spectral” tuning handles time-varying excitation frequencies, while “spatial” tuning treats the real-time variations in the desired location of suppression. Both objectives, however, must be achieved using active control and without physically altering the system components to ensure practicality. Spatial tuning is inspired by the concept of “noncollocated vibration absorption,” for which the absorber location is different from the point of suppression. This concept is relatively under-developed in the literature, mainly because it requires the use of part of the primary structure (PS) as the extended absorber—a delicate operation. Within this investigation, we employ the delayed resonator (DR)-based absorber, a hybrid concept with passive and active elements, to satisfy both tuning objectives. The presence of active control in the absorber necessitates an intriguing stability investigation of a time-delayed dynamics. For this subtask, we follow the well-established methods of frequency sweeping and D-subdivision. Example cases are also presented to corroborate our findings.

A Numerical Study of the Blade Passing Frequency Noise of a Centrifugal Fan

2012 ◽  
Author(s):  
Jian-Cheng Cai ◽  
Da-Tong Qi ◽  
Yong-Hai Zhang
Keyword(s):  
Pressure Fluctuation ◽  
Sound Radiation ◽  
Aerodynamic Noise ◽  
Sound Power ◽  
Centrifugal Fan ◽  
Structural Noise ◽  
Tonal Noise ◽  
Fan Noise ◽  
Blade Passing Frequency ◽  
Dipole Sources

Tonal noise constitutes the major part of the overall fan noise, especially the blade passing frequency (BPF) noise which is generally the most dominant component. This paper studies the BPF tonal noise of a centrifugal fan, including the blade noise, casing aerodynamic noise, and casing structural noise caused by the flow-induced casing vibration. Firstly, generation mechanism and propagation process of fan noise were discussed and the measured spectra of fan noise and casing vibration were presented. Secondly, a fully 3-D transient simulation of the internal flow field of the centrifugal fan was carried out by the computational fluid dynamics (CFD) approach. The results revealed that the flow interactions between the impeller and the volute casing caused periodic pressure fluctuations on the solid walls of the impeller and casing. This pressure fluctuation induces aerodynamic noise radiation as dipole sources, as well as structural vibration as force excitations. Thirdly, using the acoustic analogy theory, the aeroacoustic dipole sources on the casing and blade surface were extracted. The BPF casing and blade aerodynamic sound radiation were solved by the boundary element method (BEM) taking into account the scattering effect of the casing structure. Finally, the casing structural noise was studied. The casing forced vibration and sound radiation under the excitation of BPF pressure fluctuation were calculated by finite element method (FEM) and BEM, respectively. The result indicates that at the studied flow rate, the sound power levels of the casing aerodynamic noise, blade aerodynamic noise and casing structural noise are 103 dB, 91 dB and 79 dB with the reference sound power of 1×10−12 W, respectively.

Active control of a centrifugal fan in a mock laptop enclosure

2011 ◽  
Vol 130 (4) ◽  
pp. 2564-2564
Author(s):  
J. James Esplin ◽  
John K. Boyle ◽  
Scott D. Sommerfeldt ◽  
Kent L. Gee
Keyword(s):  
Active Control ◽  
Centrifugal Fan

Active control of automotive fan noise

2002 ◽  
Vol 112 (5) ◽  
pp. 2428-2428
Author(s):  
Anthony Gerard ◽  
Alain Berry ◽  
Patrice Masson
Keyword(s):  
Active Control ◽  
Fan Noise

Optimization of Low-Noise and Large Air Volume Blower Based on Load Characteristic

2015 ◽  
Vol 656-657 ◽  
pp. 700-705
Author(s):  
Jian Dong Chen ◽  
Bei Bei Sun
Keyword(s):  
Flow Rate ◽  
Low Noise ◽  
Aerodynamic Noise ◽  
Strong Wind ◽  
Centrifugal Fan ◽  
Fan Noise ◽  
Load Characteristic ◽  
Air Volume ◽  
Actual Working ◽  
Working Point

The blower is a kind of garden machinery, which blows strong wind to clean up leaves by a centrifugal fan, but it causes a loud aerodynamic noise. To compromise the contradiction between large air flow rate and low fan noise, some optimizations are proposed to reduce fan noise without lowering its air volume. In this paper, a CFD numerical model to compute airflow field of blower is established, where the centrifugal fan is simulated by the MRF model, and theturbulent model is selected. By smoothing the transition section, improving the volute tongue and optimizing the shape and optimizing number of fan blade, the blower work performance is increased obviously. In order to find out the actual working point, both the fan and motor load characteristic curves are drawn out. The simulation results show that, at the actual working point, the speed of the centrifugal fan is reduced, while the flow rate of blower is raised up. The optimizations are applied to the blower, and the experiment of the improved blower shows the flow rate is increased 5%, and the noise is reduced 2dB.

Sign in / Sign up

Export Citation Format

Share Document