Numerical characterization of landing gear aeroacoustics using advanced simulation and analysis techniques

With the objective of aircraft noise mitigation, we here address the numerical characterization of the aeroacoustics by a simplified nose landing gear (NLG), through the use of advanced simulation and signal processing techniques. To this end, the NLG noise physics is first simulated through an adva...

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Bibliographic Details
Published in:Journal of sound and vibration 2017-09, Vol.403, p.214-233
Main Authors: Redonnet, S., Ben Khelil, S., Bulté, J., Cunha, G.
Format: Article
Language:English
Subjects:
Acoustic noise
Acoustics
Aeroacoustics
Aerodynamics
Aeronautics
Aircraft noise
Airframes
Computational aeroacoustics
Computational AeroAcoustics (CAA)
Computational fluid dynamics
Computer simulation
Emission analysis
Engineering Sciences
Fluids mechanics
Gears
Hybrid approach
Landing gear
Landing gear aeroacoustics
Mathematical analysis
Mechanics
Noise
Noise control
Noise propagation
Noise source localization
Numerical simulation
Phased array techniques
Post-processing
Signal processing
Zonal Detached Eddy Simulation (ZDES)
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Summary:With the objective of aircraft noise mitigation, we here address the numerical characterization of the aeroacoustics by a simplified nose landing gear (NLG), through the use of advanced simulation and signal processing techniques. To this end, the NLG noise physics is first simulated through an advanced hybrid approach, which relies on Computational Fluid Dynamics (CFD) and Computational AeroAcoustics (CAA) calculations. Compared to more traditional hybrid methods (e.g. those relying on the use of an Acoustic Analogy), and although it is used here with some approximations made (e.g. design of the CFD-CAA interface), the present approach does not rely on restrictive assumptions (e.g. equivalent noise source, homogeneous propagation medium), which allows to incorporate more realism into the prediction. In a second step, the outputs coming from such CFD-CAA hybrid calculations are processed through both traditional and advanced post-processing techniques, thus offering to further investigate the NLG's noise source mechanisms. Among other things, this work highlights how advanced computational methodologies are now mature enough to not only simulate realistic problems of airframe noise emission, but also to investigate their underlying physics. [Display omitted] •A landing gear noise problem is addressed using advanced computational and analysis techniques.•The noise generation and propagation dynamics of the landing gear are investigated.•Validity of the techniques employed and viability of the overall strategy is demonstrated.•A step further towards the mitigation of aircraft noise problems via numerical simulation is made.
ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2017.05.012