Noise Reduction of Axial-Flow Fan by Active Control of Source.
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...
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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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15 صفحه اولDesigning Axial Flow Fan for Flow and Noise
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...
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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: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
سال: 1993
ISSN: 0387-5016,1884-8346
DOI: 10.1299/kikaib.59.3846