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

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

Prediction of the Aerodynamic Noise Generated by a Centrifugal Fan: Numerical Results and Experimental Validation

2006 ◽  
Author(s):  
Rafael Ballesteros-Tajadura ◽  
Sandra Velarde-Sua´rez ◽  
Juan Pablo Hurtado-Cruz ◽  
Bruno Pereiras-Garci´a
Keyword(s):  
Three Dimensional ◽  
Prediction Method ◽  
Numerical Results ◽  
Experimental Results ◽  
Aerodynamic Noise ◽  
Centrifugal Fan ◽  
Fan Noise ◽  
Unsteady Forces ◽  
Model Extension ◽  
Centrifugal Fans

Centrifugal fans are widely used in several applications and, in some cases, the noise generated by these machines has become a serious problem. Usually, the centrifugal fan noise is dominated by tones at the blade passage frequency and its higher harmonics. This is a consequence of the strong interaction between the flow discharged from the impeller and the volute tongue. The purpose of this study is to develop a prediction method for the noise generated by a centrifugal fan. A three-dimensional numerical simulation of the complete unsteady flow on the whole impeller-volute configuration has been carried out using the computational fluid dynamics code FLUENT®. The unsteady forces applied by the fan blades to the fluid are obtained from the data provided by the simulation. The Ffowcs Williams and Hawkings model extension of Lighthill’s analogy predicts the aerodynamic noise generated by the centrifugal fan from these unsteady forces. Also, the noise generated by the fan has been measured experimentally, and the experimental results have been compared to the numerical results in order to validate the aerodynamic noise prediction methodology. A good agreement has been found between the numerical and the experimental results.

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 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: 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

Active control of fan noise

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

Comparison of Times of Synchronization of Chaotic Burke-Shaw Attractor with Active Control and Integer and Optimum Fractional-Order Pecaro Carroll Method

2021 ◽  
Author(s):  
Ali Durdu ◽  
Yılmaz Uyaroğlu
Keyword(s):  
Active Control ◽  
Fractional Order ◽  
Chaotic Attractor ◽  
Secure Communication ◽  
Chaotic Systems ◽  
Control Method ◽  
Initial Conditions ◽  
Data Communication ◽  
Experimental Results ◽  
Active Control Method

Abstract Many studies have been introduced in the literature showing that two identical chaotic systems can be synchronized with different initial conditions. Secure data communication applications have also been made using synchronization methods. In the study, synchronization times of two popular synchronization methods are compared, which is an important issue for communication. Among the synchronization methods, active control, integer, and fractional-order Pecaro Carroll (P-C) method was used to synchronize the Burke-Shaw chaotic attractor. The experimental results showed that the P-C method with optimum fractional-order is synchronized in 2.35 times shorter time than the active control method. This shows that the P-C method using fractional-order creates less delay in synchronization and is more convenient to use in secure communication applications.

Experiments on the Active Control of Circular Disk Vibration

2001 ◽  
Author(s):  
J. B. Qiu ◽  
X. Q. Huang ◽  
D. Q. Wang
Keyword(s):  
Control System ◽  
Active Control ◽  
Transverse Vibration ◽  
Circular Disk ◽  
Experimental Results ◽  
Electromagnetic Actuator ◽  
Computer Memory ◽  
Circular Saw ◽  
Mechanical Element

Abstract Circular disk is a basic mechanical element, which is used widely in industry such as turbine machine, circular saw, and computer memory. Considering the requirements for the actuator to control the transverse vibration of circular disk, the non-contact electromagnetic actuator which can produce large actuating force is used, and a whole set of control system that is composed of analog components is built. The good experimental results are obtained by using the control system to control the transverse vibration of circular disk.

Broadband Vibration Suppression Assessment of Negative Impedance Shunts

2008 ◽  
Author(s):  
Benjamin Beck ◽  
Kenneth A. Cunefare ◽  
Massimo Ruzzene
Keyword(s):  
Active Control ◽  
Vibration Suppression ◽  
Piezoelectric Materials ◽  
Input Power ◽  
Experimental Results ◽  
Spatial Average ◽  
Negative Capacitance ◽  
Damping Properties ◽  
Control Solution ◽  
Stiffness And Damping

Piezoelectric materials allow for the manipulation of stiffness and damping properties of host structures by the application of electrical shunting networks. The use of piezoelectric patches for broadband control of vibration using a negative impedance shunt has been shown to be an effective active control solution. The wave-tuning and minimization of reactive input power shunt selection methodologies require the use a negative capacitance. This paper shows that the two theories are comparative and obtain the same shunt parameters. The results of the theoretical shunt selection and simulation are compared to experimental results of tip vibration suppression, spatial average vibration, and reactive input power minimization.

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