Method and apparatus for controlling tonal noise from subsonic fans
US8777560B2 · kind B2 · utility
1Cited by
10References
21Claims
0Family size
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Key dates
| Filing date | Jun 23, 2010 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Feb 6, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C11/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for reducing a selected tonal noise generated by a fan operating in a non-uniform flow by locating at least one obstruction in the non-uniform flow such that the at least one obstruction generates a noise that is out of phase with the selected tonal noise. The noise generated by the at least one obstruction interferes with the selected tonal noise, thus reducing the selected tonal noise. It is also contemplated to use additional obstructions to reduce other tonal noises generated by the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.