ACTIVE CONTROL OF PROPELLER-INDUCED NOISE IN AN AIRCRAFT MOCK-UP

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Sven Johansson, Per Persson, Ingvar Claesson
Title: ACTIVE CONTROL OF PROPELLER-INDUCED NOISE IN AN AIRCRAFT MOCK-UP
Conference name: Active 99
Year: 1999
Pagination: 741-752
City: Fort Lauderdale, Florida, USA
ISI number: 000165304400063
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 38 50 00
Authors e-mail: sven.johansson@bth.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 overall interior sound pressure level inside a
turboprop aircraft is typically rather high, and the passenger flight comfort could be improved considerably
if this level was significantly reduced.

This paper discusses the behaviour and robustness of a narrowband twin--reference feedforward active noise and vibration
control system in a SAAB 340 mock-up. The resulting sound pressure level were recorded and is presented as the
narrowband attenuation versus time. The spatial distribution of the sound pressure level is also presented. The results show that the twin-reference controller exhibits good performance with respect to attenuation and robustness for both stationary and non-stationary conditions.
Subject: Signal Processing\Active Noise and Vibration Control
Keywords: active noise control, feedforward control, lms
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