Design and Testing of Low Noise Landing Gears

Author:

Dobrzynski Werner M.1,Schöning Britta2,Chow Leung Choi3,Wood Chris4,Smith Malcolm5,Seror Christelle6

Affiliation:

1. Deutsches Zentrum für Luft- und Raumfahrt, Lilienthalplatz 7, 38301 Braunschweig / Germany

2. Deutsches Zentrum für Luft- und Raumfahrt, Lilienthalplatz 7, 38108 Braunschweig / Germany

3. Airbus UK, Aerodynamics Department, Building 09B, Filton, Bristol, BS99 7AR / Great Britain

4. BAESYSTEMS Regional Aircraft, Technology Group, Woodford Aerodrome, Chester Road, Woodford, Stockport, Cheshire SK7 1QR / Great Britain

5. ISVR, University of Southampton, Southampton Hampshire SO17 1BJ / Great Britain

6. Messier-Dowty SA, R&T Department, Zone Aéronautique Louis Breguet, 78140 Vélizy-Villacoublay / France

Abstract

In the approach phase of large commercial aircraft, airframe noise – and in particular that from landing gears – is one of the dominant aircraft noise components. Within a European co-financed research project entitled “Significantly Lower Community Exposure to Aircraft Noise” (codenamed SILENCER) a study in “advanced low noise landing gear design” was performed to develop operational landing gears which take into account aeroacoustic constraints early in the design stage. Airbus aircraft typical configurations of low wing with underslung engines and A340 type gears were selected as reference. RANS flow field calculations were performed and used to identify and thus avoid the impingement of high speed flow onto critical gear structure elements. The evaluation of CFD results with respect to the effects on aerodynamic noise was performed on the basis of related experimental experience and a semi-empirical landing gear noise model. Both low noise advanced nose and main landing gears were designed and manufactured at full scale for noise testing in the 8 m by 6 m open test section of the German-Dutch Wind Tunnel (DNW-LLF).

Publisher

SAGE Publications

Subject

Acoustics and Ultrasonics,Aerospace Engineering

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