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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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