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Configuration de la source secondaire pour limiter le bruit des ventilateurs dans les gaines.

A secondary source configuration for control of a ventilation fan noise in ducts.

Auteurs : PREZELJ J., CUDINA M.

Type d'article : Article

Résumé

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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Format PDF

Pages : 468-476

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    20 €

  • Prix membre*

    15 €

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Détails

  • Titre original : A secondary source configuration for control of a ventilation fan noise in ducts.
  • Identifiant de la fiche : 30001685
  • Langues : Anglais
  • Source : Strojniski vestnik - Journal of mechanical Engineering - vol. 57 - n. 6
  • Date d'édition : 06/2011
  • DOI : http://dx.doi.org/10.5545/sv-jme.2009.026

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