Experimental Performance Evaluation of a Multi-Reference Algorithm for Active Control of Propeller-Induced Cabin Noise

Document type: Researchreports
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Author(s): Sven Johansson, Per Sjösten, Per Persson, Ingvar Claesson
Title: Experimental Performance Evaluation of a Multi-Reference Algorithm for Active Control of Propeller-Induced Cabin Noise
Series: Research Report
Year: 2000
Issue: 18
ISSN: 1103-1581
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 780 00
Authors e-mail: sven.johansson.its.hk-r.se@its.hk-r.se
Language: English
Abstract: A noisy environment dominated by low frequency noise can often be improved through the use of active noise control. This situation arises naturally in propeller aircraft where the propellers induce periodic low frequency noise inside the cabin. The cabin noise is
typically rather high, and the passenger flight comfort could be improved considerably if this level were significantly reduced.


This paper discusses the operation and robustness of a narrowband feedforward active noise control system in a practical installation. The ANC system used 8 control sources and 11 control microphones, and the control algorithm was the multi-reference actuator-individual normalized filtered-x least mean squares algorithm. The experiment was performed in a full-scale fuselage
section of a SAAB 340 aircraft. To produce the propeller noise, loudspeakers mounted in a ring around the fuselage were used. Results are presented from a series of experiments on the active control of propeller-induced cabin noise. Among the ``flight" conditions evaluated were: conditions where the ``propellers" were completely synchronized, and conditions with constant as well as time-varying frequency beat between ``left and right propellers."
Subject: Signal Processing\Active Noise and Vibration Control
Keywords: active noise control, multiple reference algorithm, lms algorithm, filtered-x lms, aircraft, propeller noise
URN: urn:nbn:se:bth-00166
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