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An investigation of the effect of uneven blade spacing on the tonal noise generated by a mixed flow fan
| Content Provider | Semantic Scholar |
|---|---|
| Author | Desvard, Ludovic Hurault, Jérémy Bin, Muhammad Affendi Zamzam, Mohamed M. Symes, Ash |
| Copyright Year | 2014 |
| Abstract | The current study investigates the flow performance and sound quality for a standard and an alternative compressor design for use in a Dyson desk fan. The alternative compressor has an uneven blade spacing to spread the associated energy of a single blade passing frequency to several frequencies in order to improve sound quality. The flow performance and acoustic signature for the two designs are compared both as a standalone compressor and installed in product. A dedicated sound preference model was developed to objectively evaluate the acoustic signature of both designs. This methodology can be used to help optimise compressor design in terms of user preference. Originally published in FAN 2012, the International conference on Fan noise, technology and numerical methods An investigation of the effect of uneven blade spacing on the tonal noise generated by a mixed flow fan interest to the automotive and the aircraft industries [46]. One proposed solution to this problem and the one investigated in this paper is to unevenly space the blades of the compressor about the centre of rotation, in order to spread the single, large tone induced by the blade passing frequency into several reduced tones to improve overall sound quality. The novelty of the current study was to demonstrate this as a potential solution in the context of a domestic appliance. The issue of sound quality has been raised for radial fans [4] and axial propellers [5]. In both studies, the overall sound pressure level in dB or dB(A) and the magnitude of the tones were the important metrics used to evaluate sound quality following changes to the blade design. A different method of evaluation is presented in the current study using psychoacoustic metrics as a more thorough and relevant means to describe changes in sound quality. In the current study, a simple model highlighting the motivation for uneven blade spacing is described. An alternative compressor design is realised and the flow performance and acoustic signature for both compressor designs are measured experimentally as standalone units and as integrated components of AM01. Finally, the sound quality evaluation methodology using psychoacoustic metrics is described and the results of a validated human preference model are presented to allow for an objective comparison of sound quality between the two designs. |
| Starting Page | 23 |
| Ending Page | 31 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| Volume Number | 27 |
| Alternate Webpage(s) | https://www.acoustics.org.nz/sites/www.acoustics.org.nz/files/journal/pdfs/Ludovic_D_ANZ2014.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
