Active control of drag noise from a small axial flow fan
نویسندگان
چکیده
منابع مشابه
Multi-channel Active Control of Axial Cooling Fan Noise
A multi-channel active control system has been applied to the reduction of free-field tonal noise from a small axial cooling fan, typical of those used in office equipment and other technology. The experimental apparatus consists of an aluminum enclosure which houses the fan, an infrared detector-emitter pair which serves as a reference sensor, loudspeakers, microphones, and appropriate filters...
متن کاملSession 1pEAa: Active and Passive Control of Fan Noise 1pEAa1. Active control of axial and centrifugal fan noise
Both axial and centrifugal fans are used to cool information technology (IT) equipment. These fans generate noise that can be annoying to their users, particularly the tonal noise that can be radiated. Work has focused on developing a method to attenuate the tonal noise associated with both of these types of fans. A compact system is used, whereby control sources are placed in close proximity t...
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A comprehensive finite element methodology is developed to predict the compressible flow performance of a non-symmetric 7-blade axial flow fan, and to quantify the source strength and sound pressure levels at any location in the system. The acoustic and flow performances of the fan are predicted simultaneously using a computational aero-acoustic technique combining transient flow analysis and n...
متن کاملEXPERIMENTAL INVESTIGATION OF DRAG REDUCTION ON AHMED MODEL USING A COMBINATION OF ACTIVE FLOW CONTROL METHODS
Aerodynamic drag is an important factor in vehicles fuel consumption. Pressure drag which is the main component of total drag is a result of boundary layer separation from vehicle surface. Flow control methods are applied to avoid or at least delay separation. Depending upon whether these methods consume energy to control the flow or not, they are called active or passive control methods. In th...
متن کاملGlobal active control of axial cooling fan noise: An overview of past and present research
During the past eight years, researchers at Brigham Young University have been engaged in a pragmatic effort to actively reduce the noise radiation from small axial cooling fan noise. The first of a series of studies on the subject demonstrated that a feedforward, multichannel controller with near-field error sensors was successful in globally reducing four harmonics of the blade passage freque...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 2006
ISSN: 0001-4966
DOI: 10.1121/1.2204443