A secondary source configuration for control of a ventilation fan noise in ducts.
Author(s) : PREZELJ J., CUDINA M.
Type of article: Article
Summary
The main noise source in heating, ventilation, and air-conditioning systems is usually a ventilating fan. Noise, generated by the ventilating fan is transmitted through the duct into the living and working environment. A typical fan noise spectrum consists of a broadband noise, which is superimposed with pure tones. Different methods are available to reduce a transmission of such noise from the ventilating fan into the living and working environment. In this article it is demonstrated how a feedforward active noise control system can be implemented together with a side branch resonator. Effectiveness of the feedforward active noise control system depends on the quality of a reference signal, which should be in a perfect correlation with the primary noise. An acoustic feedback is the main problem of feedforward active noise control systems in ducts. A combined method uses a single loudspeaker to work as a dipole source and a side branch resonator to reduce the acoustic feedback. A side branch resonator reduces noise transmission in a narrowband frequency range as well. In this article, a theoretical background of a dipole source with a side branch resonator is presented, along with some measurement results and simulations of active noise control.
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Pages: 468-476
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Details
- Original title: A secondary source configuration for control of a ventilation fan noise in ducts.
- Record ID : 30001685
- Languages: English
- Source: Strojniski vestnik - Journal of mechanical Engineering - vol. 57 - n. 6
- Publication date: 2011/06
- DOI: http://dx.doi.org/10.5545/sv-jme.2009.026
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