Absorption Acoustique Active du Bruit Genere par les Ventilateurs en Conduits
Mots-clés :
active noise control, noise pollution, time-domain analysis, active acoustic absorption, fans, ducts, time domain algorithms, real-world fan noise, residual-noise sensing microphoneRésumé
Cet article est consacré à l’absorption acoustique active du bruit généré par les ventilateurs en conduit. Le contrôleur utilisé pour traiter le bruit incident et pour produire le contre-bruit est un filtre numérique autoadaptatif. Des essais pratiques sont réalisés sur plusieurs enregistrements de bruit de ventilateur afin de comparer systématiquement les performances de différents algorithmes temporels ( LMS, RLMS,... ). Cette première partie a pour but de sélectionner le meilleur algorithme parmi les quatre versions testées. Ensuite, l'algorithme sélectionné est appliqué au bruit d'un ventilateur réel et son comportement est jugé satisfaisant. Cependant, afin d'améliorer encore l'atténuation du bruit quelles que soient la fréquence et la géométrie du système, nous proposons un test préliminaire de positionnement optimal du microphone captant le bruit résiduel.Fichiers supplémentaires
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