APPLICATION OF FEEDFORWARD ADAPTIVE ACTIVE-NOISE CONTROL FOR REDUCING BLADE PASSING NOISE IN CENTRIFUGAL FANS
✍ Scribed by J.-D. WU; M.R. BAI
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 296 KB
- Volume
- 239
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
This paper describes two con"gurations of feedforward adaptive active-noise control (ANC) technique for reducing blade passing noise in centrifugal fans. In one con"guration, the control speaker is installed at the cut-o! region of the fan, while in the other con"guration at the exit duct. The proposed ANC system is based on the "ltered-x least-mean-squares (FXLMS) algorithm with multi-sine synthesized reference signal and frequency counting and is implemented by using a digital signal processor (DSP). Experiments are carried out to evaluate the proposed system for reducing the noise at the blade passing frequency (BPF) and its harmonics at various #ow speeds. The results of the experiment indicated that the ANC technique is e!ective in reducing the blade passing noise for two con"gurations by using the feedforward adaptive control.