Active acoustic absorption of noise generated by fans in ducts

Authors

  • F. Duthoit Service d'Acoustique Appliquee, Liege Univ., Belgium

Keywords:

active noise control, noise pollution, time-domain analysis, active acoustic absorption, fans, ducts, time domain algorithms, real-world fan noise, residual-noise sensing microphone

Abstract

This paper investigates active control of noise generated by fans in ducts. We use an adaptive digital filter to process the incident noise and to create the antinoise. Time domain algorithms (LMS, RLMS, ...) are tested with several recordings of fan noise and their performances are compared. This first part is intended to select the best algorithm among four tested versions. Then, we use the best algorithm with a real-world fan noise. Results are seen to be satisfactory and can still be better if the optimal position of the residual-noise sensing microphone is chosen on the basis of some preliminary test. This procedure allows efficient processing in a wide range of frequencies and system geometries

Additional Files

Published

1995-12-01

How to Cite

1.
Duthoit F. Active acoustic absorption of noise generated by fans in ducts. Canadian Acoustics [Internet]. 1995 Dec. 1 [cited 2025 Feb. 22];23(4):15-38. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/974

Issue

Vol. 23 No. 4 (1995)

Section

Technical Articles

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