𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Noise reduction of a miniature fan by using blade treatment

✍ Scribed by G.G. Tseo

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
272 KB
Volume
32
Category
Article
ISSN
0022-460X

No coin nor oath required. For personal study only.

✦ Synopsis

The method of noise reduction by providing porous surface [1, 2] on the fan blade was experimentally investigated on a miniature axial-flow fan that is popularly used in cooling for a business machine. Different porous materials such as foam, fiberglass and felt metal were evaluated on the fan. Narrow-band analyses are presented to show the effectiveness on quietening the blade pressure noise and vortex shedding noise by making use of their frequency spectrum signature. A simulation test with a stationary blade is given to verify the identification of vortex shedding noise.

πŸ“œ SIMILAR VOLUMES

Unbiased Separation and Enhancement of S
Unbiased Separation and Enhancement of Sources by Using a Zero Tracking Algorithm with Post Processing Adaptive Noise Reduction
✍ C.C. Ko; H.K. Garg πŸ“‚ Article πŸ“… 1997 πŸ› Elsevier Science 🌐 English βš– 229 KB

This paper proposes and investigates a new structure for the unbiased separation, tracking, and enhancement of uncorrelated sources by a linear array. The structure consists of a matrix preprocessing beamformer followed by an adaptive linear combiner and a postprocessing beamformer. The weights of t

Enhanced detection sensitivity of β€œfluor
Enhanced detection sensitivity of β€œfluorescence reduction” by shifting the analyte absorbance spectrum and use of a fluorescent paper with higher signal/noise ratio
✍ Elena Yarmola; Nong Chen; David Yi; Dr. Andreas Chrambach πŸ“‚ Article πŸ“… 1998 πŸ› John Wiley and Sons 🌐 English βš– 557 KB

## Enhanced detection sensitivity of "fluorescence reduction" by shifting the analyte absorbance spectrum and use of a fluorescent paper with higher signalhoise ratio Nonfluorescing protein bands can be detected by the fluorescence optics of the commercial gel electrophoresis apparatus with automa