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DLR Refines Aircraft Cabin Noise

dlr, germany

Introduction

Deutsches Zentrum für Luft- und Raumfahrt (DLR) is Germany’s national research centre for aeronautics and space. Their Experimental Methods department set out to investigate noise transmission and propagation on the Airbus A320 family of aircraft.

Brüel & Kjær’s multi-field microphone measured the uncertain sound field inside the aircraft cabin, and between the fuselage and the lining.

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Challenge
Solution
Result
Client Description

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Investigate noise transmission and propagation on the Airbus A320 family of commercial aircraft, while improving the methodology of flight tests.

Relating external vibration and pressure to interior noise, using multi-field microphones to measure the uncertain sound field inside the aircraft cabin, and in the small areas between the fuselage and lining.

By combining sound measurement results with those from pressure sensors and accelerometers, the tests established a clear link between coherent fluctuations in the turbulent boundary layer and the noise experienced in the cabin. This enabled Airbus to adapt the fuselage to avoid these fluctuations.

DLR

DLR's identity is that of a research institution focused on scientific excellence. It also acts as a capable administrative organisation that strengthens Germany as a location for knowledge and innovation. DLR’s activities focus on its role within society and its responsibility towards clients, business partners, affiliates and employees, as well as on sustainable action. It is within this context that DLR contributes to solving societal issues.

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