Abstract
In addition to meeting sound level criteria, an increasing emphasis is placed on the sound quality of systems and fans. In previous studies, numerical techniques were developed to predict noise from small cooling fans and a specialized experimental setup was presented for flow visualization. This paper outlines the next step: an experimental setup to quantify the sensitivity of several sound quality metrics to fan design parameters. The key metrics included in this study were sound pressure, loudness, tonality, sharpness, and roughness. In addition, the spatial variation of these metrics was characterized and empirical correlations between metrics were extracted. As an example, the experimental setup was used to characterize the design parameters that affect the sound quality of a small axial fan.
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