Sactive Noise Control Technique Application in Air Conditioning Ducts

Active Noise Control (ANC) is a technique for reducing noise by destructive interference of noise sound wave by out-of-phase secondary sound wave. In air conditioning installations, high frequency noises are effectively attenuated by porous-structured medium; but the low frequency noise produced by...

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Main Author:	Decruz, Aloysius
Format:	Thesis
Language:	English English
Published:	2009
Subjects:
Online Access:	http://psasir.upm.edu.my/id/eprint/7807/1/abs_----_FK_2009_69.pdf
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id	my-upm-ir.7807
record_format	uketd_dc
spelling	my-upm-ir.78072013-05-27T07:36:31Z Sactive Noise Control Technique Application in Air Conditioning Ducts 2009 Decruz, Aloysius Active Noise Control (ANC) is a technique for reducing noise by destructive interference of noise sound wave by out-of-phase secondary sound wave. In air conditioning installations, high frequency noises are effectively attenuated by porous-structured medium; but the low frequency noise produced by the fan needs a more sophisticated approach. An algorithm, ‘Hardware-Tuned Feedback ANC (HTFA)’, has been developed to implement the ANC technique for the noise reduction application in an air conditioning duct element, where Digital Signal Processing is used to sample noise and produce a complete anti-phase noise produced by the HTFA algorithm. Typical blade pass frequency in the vicinity of 100 Hz require sampling frequency of minimum twice that value. A 600 MHz fixed point Digital Signal Processor (DSP) from Texas Instrument, TMS320C6416DSK, is used to generate a secondary sound field by using an adaptive algorithm of Least Mean Square (LMS) principle for convergence. A duct section is used for the experiment and the effectiveness of low frequency attenuation by the secondary sound field is measured. Low and medium frequency tonal noises of octave bands 63 Hz – 1000 Hz were tested, low frequency below 250 Hz being the range of interest. Optimum frequency values for which ANC is more effective are determined. It was found that Active Noise Cancellation is effective at 63 Hz and 125 Hz. This is a simple, economic and effective method for noise cancellation compared to existing feed-forward software tuned method. 2009 Thesis http://psasir.upm.edu.my/id/eprint/7807/ http://psasir.upm.edu.my/id/eprint/7807/1/abs_----_FK_2009_69.pdf application/pdf en public masters Universiti Putra Malaysia Faculty of Engineering English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic
spellingShingle	Decruz, Aloysius Sactive Noise Control Technique Application in Air Conditioning Ducts
description	Active Noise Control (ANC) is a technique for reducing noise by destructive interference of noise sound wave by out-of-phase secondary sound wave. In air conditioning installations, high frequency noises are effectively attenuated by porous-structured medium; but the low frequency noise produced by the fan needs a more sophisticated approach. An algorithm, ‘Hardware-Tuned Feedback ANC (HTFA)’, has been developed to implement the ANC technique for the noise reduction application in an air conditioning duct element, where Digital Signal Processing is used to sample noise and produce a complete anti-phase noise produced by the HTFA algorithm. Typical blade pass frequency in the vicinity of 100 Hz require sampling frequency of minimum twice that value. A 600 MHz fixed point Digital Signal Processor (DSP) from Texas Instrument, TMS320C6416DSK, is used to generate a secondary sound field by using an adaptive algorithm of Least Mean Square (LMS) principle for convergence. A duct section is used for the experiment and the effectiveness of low frequency attenuation by the secondary sound field is measured. Low and medium frequency tonal noises of octave bands 63 Hz – 1000 Hz were tested, low frequency below 250 Hz being the range of interest. Optimum frequency values for which ANC is more effective are determined. It was found that Active Noise Cancellation is effective at 63 Hz and 125 Hz. This is a simple, economic and effective method for noise cancellation compared to existing feed-forward software tuned method.
format	Thesis
qualification_level	Master's degree
author	Decruz, Aloysius
author_facet	Decruz, Aloysius
author_sort	Decruz, Aloysius
title	Sactive Noise Control Technique Application in Air Conditioning Ducts
title_short	Sactive Noise Control Technique Application in Air Conditioning Ducts
title_full	Sactive Noise Control Technique Application in Air Conditioning Ducts
title_fullStr	Sactive Noise Control Technique Application in Air Conditioning Ducts
title_full_unstemmed	Sactive Noise Control Technique Application in Air Conditioning Ducts
title_sort	sactive noise control technique application in air conditioning ducts
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Engineering
publishDate	2009
url	http://psasir.upm.edu.my/id/eprint/7807/1/abs_----_FK_2009_69.pdf
_version_	1747810709729705984

Sactive Noise Control Technique Application in Air Conditioning Ducts

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