Experimental Study on Aircraft Landing Gear Noise

2006 ◽  
Vol 43 (2) ◽  
pp. 306-317 ◽  
Author(s):  
Y. P. Guo ◽  
K. J. Yamamoto ◽  
R. W. Stoker
Keyword(s):  
Experimental Study ◽  
Landing Gear ◽  
Gear Noise ◽  
Aircraft Landing ◽  
Aircraft Landing Gear ◽  
Landing Gear Noise

Measurement of ARJ21 Aircraft Landing Gear Noise Using Array Signal Processing Technology

2012 ◽  
Vol 588-589 ◽  
pp. 747-750
Author(s):  
Tao Chen ◽  
Hong Hou ◽  
Zhi Fei Chen ◽  
Cheng Kun Jiang
Keyword(s):  
Array Signal Processing ◽  
Phased Array ◽  
Landing Gear ◽  
Gear Noise ◽  
Doppler Shifts ◽  
Aircraft Landing ◽  
Data Processing Method ◽  
Spatially Distributed ◽  
Noise Measurements ◽  
Landing Gear Noise

Flyover noise measurements were conducted on an aircraft ARJ21 aiming at landing gear noise prediction schemes. The analysis is based on acoustic dedopplerized spectra and localization maps was calculated with the pressure signals of a acoustic phased array with 30 microphones. The acoustic phased array is a spatially distributed set of microphones which simultaneously sample the acoustic field. The doppler shifts was removed using linear interpolation.By appropriately time delaying the output of individual microphones, the origin and level of noise source(the landing gear) can potentially be determined. The success of this approach depends largely on the phased array design, and the array data processing method. This paper focuses on the two areas.

scholarly journals Aeroacoustic Source Separation on a Full Scale Nose Landing Gear Featuring Combinations of Low Noise Technologies

2015 ◽  
Author(s):  
Eleonora Neri ◽  
John Kennedy ◽  
Gareth J. Bennett
Keyword(s):  
Noise Reduction ◽  
Low Noise ◽  
Landing Gear ◽  
Full Scale ◽  
Commercial Aircraft ◽  
Noise Sources ◽  
Gear Noise ◽  
Aircraft Landing ◽  
Total Noise ◽  
Landing Gear Noise

The reduction of noise generated by aircraft at take-off and approach is crucial in the design of new commercial aircraft. Landing gear noise is significant contribution to the total noise sources during approach. The noise is generated by the interaction between the non-aerodynamic components of the landing gear and the flow, which leads to turbulence generated noise. This research presents results from the European Clean Sky funded ALLEGRA project. The project investigated a full-scale Nose Landing Gear (NLG) model featuring the belly fuselage, bay cavity and hydraulic dressing. A number of low noise treatments were applied to the NLG model including a ramp door spoiler, a wheel axel wind shield, wheel hub caps and perforated fairings. Over 250 far field sensors were deployed in a number of microphone arrays. Since technologies were tested both in isolation and in combination the additive effects of the technologies can be assessed. This study describes the different techniques used to quantify the contribution of each technology to the global noise reduction. The noise reduction technologies will be assessed as a function of frequency range and through beamforming techniques such as source deletion.

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