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https://hdl.handle.net/2440/2882
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Type: | Journal article |
Title: | Minimizing wind effects on active control systems for attenuating outdoor transformer noise |
Author: | Ai, Y. Qiu, X. Hansen, C. |
Citation: | Noise Control Engineering Journal, 2000; 48(4):130-135 |
Publisher: | Inst Noise Control Eng |
Issue Date: | 2000 |
ISSN: | 0736-2501 |
Abstract: | Turbulent pressure fluctuations resulting from wind blowing over a microphone can result in significant distortion of the acoustic signal output from the microphone. This distortion can have a significant detrimental impact on an active noise cancellation system used to reduce the noise radiated by an outdoor source such as an electrical power transformer. Even using a band pass digital filter in the active noise canceling electronics is ineffective because the large wind-induced signal effectively reduce the dynamic range of A/D converters. Here the characteristics of wind-induced noise and standard foam windscreens are analyzed and the effectiveness of a high pass filter together with a foam windscreen for reducing the effect of wind-induced signals are evaluated. Combination of a windscreen with a high pass filter of appropriate order is shown to increase the signal to noise ratio of the transformer sound by about 20 dB over that achieved with a windscreen only. |
DOI: | 10.3397/1.2827968 |
Published version: | http://dx.doi.org/10.3397/1.2827968 |
Appears in Collections: | Aurora harvest 2 Environment Institute publications Mechanical Engineering publications |
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