Proceedings ArticleDOI
Investigating landing gear noise using fly-over data: the case of a Boeing 747-400
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In this article, the authors investigated the landing gear noise of the Boeing 747-400 in flight and compared different fly-over velocities in order to obtain a scaling law for the sound pressure level based on microphone Array measurements.Abstract:
Investigation of the landing gear noise of the Boeing
747-400 in flight Comparison of different fly-over
velocities in order to obtain a scaling law for the
Sound pressure Level based on microphone Array measurementsread more
Citations
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Journal ArticleDOI
A review of acoustic imaging methods using phased microphone arrays
Roberto Merino-Martínez,Pieter Sijtsma,Mirjam Snellen,Thomas Ahlefeldt,Jérôme Antoni,Christopher J. Bahr,D. Blacodon,Daniel Ernst,A. Finez,S. Funke,Thomas F. Geyer,Stefan Haxter,Gert Herold,Xun Huang,William M. Humphreys,Quentin Leclere,A.M.N. Malgoezar,Ulf Michel,Thomas Padois,A. Pereira,Christophe Picard,Ennes Sarradj,Henri Siller,Dick G. Simons,Carsten Spehr +24 more
TL;DR: This paper provides a review of the most well-known and state-of-the-art acoustic imaging methods and recommendations on when to use them, as well as a broad overview for general aeroacoustic experts.
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Aircraft noise prediction
TL;DR: It is contended that the field of aircraft noise prediction has not yet reached a sufficient level of maturity, in particular, some parametric effects cannot be investigated, issues of accuracy are not currently addressed, and validation standards are still lacking.
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Bay cavity noise for full-scale nose landing gear: A comparison between experimental and numerical results
TL;DR: In this paper, the authors used the Rossiter equation to explain fluid-resonant lock-on between the shear layer instability modes and the excited resonant modes as a function of tunnel velocity.
Proceedings ArticleDOI
Comparing flyover noise measurements to full-scale nose landing gear wind tunnel experiments for regional aircraft
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Noise Characterization of a Full-Scale Nose Landing Gear
TL;DR: In this paper, a detailed model of the nose section of a 90-seat configuration green regional aircraft concept was built and a nose landing-gear test campaign was conducted to evaluate its performance.
References
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Journal ArticleDOI
Almost 40 Years of Airframe Noise Research: What Did We Achieve?
TL;DR: In this article, the authors provide a concise survey of the achievements in airframe noise source description and reduction over the last 40 years worldwide and provide examples but do not claim to be complete.
The Airframe Noise Reduction Challenge
TL;DR: In this article, the authors investigate the lower bound of the noise generated by an aircraft modified with a virtual retrofit capable of eliminating all noise associated with the high lift system and landing gear.
Journal ArticleDOI
Experimental Study on Aircraft Landing Gear Noise
TL;DR: In this article, an experimental investigation on aircraft landing gear noise is presented, which includes systematic testing and data analysis using a full-scale Boeing 737 landing gear, and it is shown that the noise spectrum can be decomposed into three frequency components, namely, the low-, mid-, and high-frequency components, representing contributions from the wheels, the main struts, and small details such as hoses, wires, cutouts, and steps.
Proceedings ArticleDOI
Airframe noise characteristics from flyover measurements and prediction
Michael Pott-Pollenske,Werner Dobrzynski,Heino Buchholz,Sebastien Guerin,Gerd Saueressig,Ullrich Finke +5 more
TL;DR: In this article, the results of dedicated wind tunnel studies were developed for both high lift devices' and landing gear noise to support the calculation of noise impact in the vicinity of airports, and flyover noise measurements were conducted on an Airbus A319 aiming at the validation of DLR's airframe noise prediction schemes.
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