We present in this paper same preliminary results of a study on A.N.C. of aircraft noise near airports with active arrays of cancelling sources. More precisely, we investigate the capability of adaptive algorithms such as the well-known filtered-x LMS algorithm to track and cancel in some limited area, the noise produced by aircrafts during the taking-off or landing phases. In such a problem two aspects have to be considered: the spatial aspect (what area can be protected by the active barrier?), and the signal processing aspect (is the algorithm able to cancel a varying broadband noise?). We principally deal with this second aspect in this paper. Some theoretical considerations and some simulation results of the problem are presented. We also present the results obtained on an experimental set-up realized in an anechoic room. In this experiment, a primary loudspeaker driven by several noises (pure tones, broadband noise, aircraft noise...) was moving along a 10-meter rail at several speeds. An active system with one reference microphone, one secondary source and one error microphone was tested and showed the tracking capability of the filtered-x LMS algorithm.
Active noise control of a moving source
Aktive Geräuschregelung einer sich bewegenden Schallquelle
2002
10 Seiten, 8 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
ACTIVE CONTROL OF A MOVING NOISE SOURCE-EFFECT OF OFF-AXIS SOURCE POSITION
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