PERFORMANCE OF A SINGLE- VERSUS A TWIN-REFERENCE CONTROLLER IN A NARROWBAND ACTIVE NOISE CONTROL APPLICATION

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Sven Johansson, Thomas L Lagö, Ingvar Claesson
Title: PERFORMANCE OF A SINGLE- VERSUS A TWIN-REFERENCE CONTROLLER IN A NARROWBAND ACTIVE NOISE CONTROL APPLICATION
Conference name: IMAX XVII
Year: 1999
Publisher: The Society for Experimental Mechanics (SEM)
City: Kissimmee, Florida, USA
ISI number: 000079283700054
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: In many applications of noise control, the greatest annoyance is caused by periodic low frequency noise. Successful reduction of
such noise can often be achieved by using an Active Noise Control (ANC) system with narrowband feedforward control. If several noise sources contribute to the sound field, a multiple--reference control system is usually required. This allows the reference signals from each noise source to be processed individually within the controller, thereby enabling individual control of the sound field from each noise source. The present paper addresses the problem of controlling noise from two sources that are more or less synchronized. A typical application is the control of propeller-generated noise within a twin propeller aircraft. To find out whether a multiple-reference controller is necessary, or if a single--reference controller can do the job, the performance of a single- versus twin-tacho control algorithm was evaluated in a comparative study. The study is a computer simulation using real life data recorded in a Dornier 328 under different flight conditions. The results demonstrate that the twin-tacho algorithm performs better than the single-tacho whenever there is a slight deviation in the rotational speed of the two propellers.
Subject: Signal Processing\Active Noise and Vibration Control
Keywords: active noise control
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