scholarly journals Aeroacoustic Evaluation of Flap and Landing Gear Noise Reduction Concepts

2014 ◽  
Author(s):  
Mehdi R. Khorrami ◽  
William M. Humphreys ◽  
David P. Lockard ◽  
Patricio A. Ravetta
Keyword(s):  
Noise Reduction ◽  
Landing Gear ◽  
Gear Noise ◽  
Landing Gear Noise

Numerical Simulation of Main Landing Gear Noise Reduction in FQUROH Flight Demonstration

2019 ◽  
Author(s):  
Mitsuhiro Murayama ◽  
Takehisa Takaishi ◽  
Yasushi Ito ◽  
Yuzuru Yokokawa ◽  
Kazuomi Yamamoto ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Noise Reduction ◽  
Landing Gear ◽  
Gear Noise ◽  
Landing Gear Noise

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.

Flight-Test Evaluation of Landing Gear Noise Reduction Technologies

2019 ◽  
Author(s):  
Mehdi R. Khorrami ◽  
David P. Lockard ◽  
William M. Humphreys ◽  
Patricio A. Ravetta
Keyword(s):  
Noise Reduction ◽  
Flight Test ◽  
Landing Gear ◽  
Test Evaluation ◽  
Gear Noise ◽  
Landing Gear Noise
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