Topic
Aircraft noise
About: Aircraft noise is a research topic. Over the lifetime, 3051 publications have been published within this topic receiving 32039 citations.
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01 Apr 1972
TL;DR: In this article, the procedures for selecting engines for transport and combat aircraft during the design process are presented, and the aerodynamic characteristics of supercritical wings and their effect on engine selection are reported.
Abstract: The procedures for selecting engines for transport and combat aircraft during the design process are presented. The types of aircraft considered are: (1) a long haul conventional takeoff and landing transport, (2) a short haul vertical takeoff and landing transport, (3) a long range supersonic transport, and (4) a fighter aircraft. The influence of aircraft noise considerations on engine selection is examined. The aerodynamic characteristics of supercritical wings and their effect on engine selection are reported.
9 citations
01 Jan 2007
TL;DR: In this article, the effects of road traffic noise and aircraft noise on annoyance were investigated and it was found that at high levels of aircraft noise exposure, the exposure effect curve even reverses, with other words: follows a negative trend.
Abstract: Although increasing consideration has been given to the effects of noise from the combination of rail and road traffic, data for the combined effects from road traffic and aircraft noise are rather scarce. In order to elucidate the combined effect of these two noise types on annoyance, previously published data from two aircraft noise annoyance surveys conducted in 2001 and 2003 among residents in the vicinity of Zurich Airport have recently been completed with road traffic noise exposure data. One of the research questions was, whether road traffic noise, due to its continuous nature, is better able to mask aircraft noise events and thus rather modifies aircraft noise annoyance than vice-versa. Analyses were conducted in accordance with the methodology outlined in the paper by Lercher et al. [1]. A similar effect as found with railway noise annoyance in the aforementioned paper has been found with aircraft noise: its annoyance reaction was modified through additional road traffic noise although the effect was not very strong. Interestingly, for road traffic noise annoyance, it was found that at high levels of aircraft noise exposure, the exposureeffect curve even reverses, with other words: follows a negative trend.
9 citations
01 May 1977
TL;DR: In this paper, subjective ratings of annoyance caused by helicopter noise relative to that caused by fixed-wing aircraft were obtained and a comparison of the subjective ratings with various physical predictors of annoyance indicated that the integrated A-weighted level (dBA) predicted as well as any of the predictors with the D2 weighted level and EPNL almost equivalent.
Abstract: : Subjective ratings of annoyance caused by helicopter noise relative to that caused by fixed-wing aircraft were obtained. Comparison of the subjective ratings with various physical predictors of annoyance indicated that the integrated A-weighted level (dBA) predicted as well as any of the predictors with the D2-weighted level and EPNL almost equivalent. The B-weighted level and C-weighted level did not predict as well. No correction factor for the impulsive character (blade slap) of the helicopter noise was required. No substantial penalty for helicopters compared to fixed-wing aircraft noise was required. (Author)
9 citations
15 Dec 2010
TL;DR: In this article, the authors developed noise prediction models and add-on noise reduction fairings to protect complex gear structures from high-speed inflow, providing the only limited noise reduction potential.
Abstract: Noise originating from flow around aircraft landing gears is one of the major components of aircraft noise in the approach phase. Owing to the complex structure of landing gears, they represent a cluster of aerodynamic noise sources that are difficult to deal with for the purpose of noise reduction. Moreover, a variety of safety and operational constraints must be considered. Landing gear noise intensity increases proportionally to the 6th power of flow velocity while the sound frequencies increase linearly with the velocity. Through wind tunnel tests on full-scale gears, typical noise characteristics (spectrum and directivity) and the noisiest gear components can be identified. On the basis of this knowledge, both noise prediction models and add-on noise reduction fairings can be developed. Such fairings, to protect complex gear structures from high-speed inflow, provide the only limited noise reduction potential. Much higher noise benefits can be achieved for new landing gears of future aircraft, when aeroacoustic constraints are introduced as an additional design criterion, thus enabling a low-noise design of both the overall gear architecture and of individual gear components. On top of that, both passive and active flow control means can be applied locally to gear components for further noise reduction.
Keywords:
airframe noise;
landing gear noise;
add-on gear fairings;
low-noise gear design;
flow control
9 citations
TL;DR: In this paper, the authors describe the philosophy behind a social survey designed to eliminate some causes of this variability, by considering a small geographical area over which the noise from one aircraft flyover is nearly constant, is outlined.
9 citations