Journal ArticleDOI
Airframe Noise Sources and Reduction Technologies in Aircraft
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TLDR
In this article, a review of major components of airframe noise and technologies with the greatest potential to reduce the non-propulsive component of aircraft noise is presented, which is the dominant component of the total noise radiated from commercial aircraft.Abstract:
The continuous increase of the air traffic linked to the operations around airports leads to increase the community noise problem. Aircraft noise is an issue of enormous environmental and technological impact. Projected growth in significant quieting of modern jet engine has brought renewed attention to the nonpropulsive component of aircraft noise. Airframe-generated noise can be the dominant component of the total noise radiated from commercial aircraft, particularly for large aircraft and especially during the landing approach. In this paper, a review of major components of airframe noise and technologies with the greatest potential to reduce airframe noise are presented.read more
Citations
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Using Acoustic Liner for Fan Noise Reduction in Modern Turbofan Engines
TL;DR: In this article, acoustic liners are placed upstream and downstream of the rotors (fans) to absorb sound before it propagates out of the inlet and exhaust ducts, which is a successful method of reducing noise in modern turbofan engines.
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Noise Reduction in Buildings Using Sound Absorbing Materials
TL;DR: In this article, sound absorption technology as an effective noise reduction technology buildings using sustainable acoustic absorbers, will be discussed, where sound absorbing materials absorb most of the sound energy striking them and reflect very little.
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Main fan noise mitigation technologies in turbofan engines
TL;DR: In this paper, the main fan noise mitigation technologies in turbofan engines are discussed and compared to those of the early jet engine designs, with the reduction in jet speed and its control requiring an immense research effort.
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Computational study of the effect of structural compliance on the noise radiated from an elastic trailing-edge
TL;DR: In this article, the effect of the structural compliance of an elastic trailing edge (TE) on its aeroacoustic response is investigated by means of Direct Numerical Simulation (DNS).
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Low-frequency interior noise in prop-driven aircrafts: Sources and control methodologies
TL;DR: Noise has turned into one of the most important among the environmental factors on which industry sets down a big part of its efforts and concerns and therefore it is reasonable to pursue Technology Assessment concerning noisy technologies.
References
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Journal ArticleDOI
Experimental investigations in low-noise trailing-edge design
Michaela Herr,Werner Dobrzynski +1 more
TL;DR: In this paper, a parametric study on brush-type trailing edge extensions was conducted to determine the noise reduction potential of several design concepts, including broadband turbulent boundary layer noise suppression and narrowband bluntness noise suppression.
Proceedings ArticleDOI
Computational Aeroacoustic Analysis of Slat Trailing-Edge Flow
Bart A. Singer,David P. Lockard,Kenneth S. Brentner,Mehdi R. Khorrami,Mert E. Berkman,Meelan M. Choudhari +5 more
TL;DR: In this article, an acoustic analysis based on the Fowcs Williams and Hawkings equation was performed for a high-lift system using un- steady flow data obtained from a highly resolved, time-dependent, Reynolds-averaged Navier-Stokes calculation.
Journal ArticleDOI
Computational Aeroacoustic Analysis of Slat Trailing-Edge Flow
A Singer Bart,P Lockard David,S Brentner Kenneth,R Khorrami Mehdi,E Berkman Mert,Choudhari Meelan +5 more
TL;DR: In this article, an acoustic analysis based on the Fowcs Williams and Hawkings equation was performed for a high-lift system using unsteady flow data obtained from a highly resolved, time-dependent, Reynolds-averaged Navier-Stokes caclulation.
Journal ArticleDOI
Flap-edge aeroacoustic measurements and predictions
TL;DR: In this paper, a model of a main element wing section with a half-span flap was tested at low speeds of up to a Mach number of 0.17, corresponding to a wing chord Reynolds number of approximately 1.7 million.
Journal ArticleDOI
The prediction of airframe noise and comparison with experiment
TL;DR: In this article, the major components of airframe noise are discussed and a comparison is made between prediction and experimental data and the prospects for airframe noisiness reduction is made.