Noise sources control of an aircraft landing gear

Li, Yong, Smith, Malcolm G., Zhang, Xin and Molin, Nicolas (2007) Noise sources control of an aircraft landing gear. 13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference), , Rome, Italy. 21 - 23 May 2007.

Abstract

Landing gears are one of the major sources of airframe noise at approach and previous
studies have shown that fairings can be used successfully to reduce broadband noise
radiation in the mid- and high-frequency ranges1. In flight tests2,3, however, the overall
benefit of the fairings was offset by an increase in low frequency broadband noise and a new
tonal noise source that was believed to originate from the leg-door or hinge-door of the gear.
This paper describes an experimental study on a 1/4 scale model of the main landing gear of
the aircraft to control the low-frequency broadband noise and to identify and eliminate the
source of the tone, whilst retaining the noise reduction capability at higher frequencies. The
aeroacoustic and aerodynamic characteristics of the model were assessed in a low-speed
closed-loop wind tunnel using phased microphone arrays on the roof and wall of the tunnel
and surface pressure transducers on the gear. The tone could be readily suppressed or
reduced by a number of different treatments. Control of low frequency noise was less
straightforward, although some preliminary solutions have been identified.

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