Empirical Study of Noise Characteristics of Typical Centrifugal Fan Based on Special Quantities Using Sound Intensity Based Method
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Date
2014-04-08
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Brieflands
Abstract
In order to identify best treatments at noisy sources, experts must employ special noise quantities. Sound pressure close to sources is usually dependent upon the environments; therefore it is not suitable for determining noise emission of sources. This paper aims to empirically study noise emission characteristics of a typical centrifugal fan located in different layouts based on special quantities using sound intensity based method. : In situ determination of noise emission of the fan included sound power, sound intensity and sound pressure was performed using BSWA VA-Lab software according to standard methods in different locations. : The results showed that sound power spectrum of the fan are relatively high and contains predominant diceret tone in 250 Hz equal to 83.5 dB. The sound powers of the fan were similar in different locations. However, notable difference exists in the sound intensities of thefan in different layouts which are near to the values calculated by theorical equation. In order to determine the optimum locations for studied centrifugal fan, sound intensity could also accurately describe the effects of adjacent surfaces on the centrifugal fan noise than sound pressure. : This study empirically showed that sound power of fan is independent of the environments and can help us evaluate noise controls at fan elements. The results confirmed that the sound power and the intensity were excellent quantities for characterizing noisy sources as centrifugal fan compared with the sound pressure. These results presented details of a scientific approach for analyzing noise in workrooms.