Open Access

ARTICLE

Feedback Active Noise Control in a Crew Rest Compartment Mock-Up

Delf Sachau¹

1 Department of Mechatronics, Helmut-Schmidt-University / University of the Federal Armed Forces, Holstenhofweg 85, 22043 Hamburg, Germany. Email:sachau@hsu-hh.de

Structural Longevity 2012, 8(1), 23-35. https://doi.org/10.3970/sl.2012.008.023

Abstract

In the process of creating more fuel efficient aircraft, lightweight materials have found a broad spectrum of applications, especially in the design of aircraft cabin structures. However, in many cases considerations towards acoustic design specifications and work environment regulations require that the previously lightweight structures are treated with heavy and often bulky damping material. In some cases, as with the small rest areas of a crew rest compartment (CRC), this makes the use of active control systems attractive. In this study, the design and application of local active noise control methods in small aircraft cabin areas such as the CRC of a long range jet is discussed. The approach comprises an adaptive multichannel feedback controller with a type of virtual microphone which is implemented and tested in an acoustic mock-up. Significant noise attenuation is achieved for frequencies below 400 Hz in a zone of quiet that extends over the sides of an arti- ficial head. Further system improvement strategies and enhancements are described such as convergence improvement by a prediction-error-filter based equalization of secondary path characteristics as well as the use of the filtered-error feedback filtered-reference LMS algorithm.

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