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Abstract
The cause of high noise generated by a table fan has been investigated. The noise source was identified by sound intensity mapping and frequency analysis of noise signal. The base of the fan stand was radiating high noise. The cause of this noise was found to be due to the resonance of fan stand. The excitation forcing frequencies were traced to the magnetic noise of the fan motor. A substantial noise reduction was achieved when the natural frequencies of fan stand were altered by stiffening its base and by increasing the mass of the base.
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