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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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Proceedings ArticleDOI
01 Feb 1979
TL;DR: In this article, structural and acoustic finite element coupled models of a single engine general aviation aircraft were used to determine the importance of engine induced structural borne noise and determine the necessary modeling requirements for the prediction of structural borne interior noise.
Abstract: Structural borne interior noise in a single engine general aviation aircraft was studied to determine the importance of engine induced structural borne noise and to determine the necessary modeling requirements for the prediction of structural borne interior noise. Engine attached/detached ground test data show that engine induced structural borne noise is a primary interior noise source for the single engine test aircraft, cabin noise is highly influenced by responses at the propeller tone, and cabin acoustic resonances can influence overall noise levels. Results from structural and acoustic finite element coupled models of the test aircraft show that wall flexibility has a strong influence on fundamental cabin acoustic resonances, the lightweight fuselage structure has a high modal density, and finite element analysis procedures are appropriate for the prediction of structural borne noise.

17 citations

Journal ArticleDOI
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.
Abstract: With the increase in global air travel, aircraft noise has become a major public issue. In modern aircraft engines, only a small proportion of the air that passes through the whole engine actually goes through the core of the engine, the rest passes around it down the bypass duct. A successful method of reducing noise further, even in ultra-high bypass ratio engines, is to absorb the sound created within the engine. Acoustically absorbent material or acoustic liners have desirable acoustic attenuation properties and thus are commonly used to reduce noise in jet engines. The liners typically are placed upstream and downstream of the rotors (fans) to absorb sound before it propagates out of the inlet and exhaust ducts. Noise attenuation can be dramatically improved by increasing the area over which a noise reducing material is applied and by placing the material closer to the noise source. In this paper we will briefly discuss acoustic liner applications in modern turbofan engines.

17 citations

Journal ArticleDOI
TL;DR: In this paper, the causal relationships between aircraft noise exposure, annoyance and certain "psycho-social" variables (fear of aircraft crashing, general attitude towards aviation, etc.), are re-analysed, and it is demonstrated that using correlational analysis one can arrive at contradictory results.

17 citations

Proceedings ArticleDOI
16 Jun 2014
TL;DR: The research builds on the previous research into aircraft noise annoyance at RWTH Aachen where the sound quality metrics of loudness and tonality were compared to the more conventional metrics dBA, PNL, PNLT and EPNL for standard and noise abatement aircraft procedures.
Abstract: The assessment of aircraft noise for community noise impact and certification has till now been performed conventionally using the A-weighted decibel (dBA) and Effective Perceived Noise Level (EPNL) metrics respectively. Although these metrics have sufficed till now for conventional noise assessment, the renewed interest in unconventional engines such as Counter Rotating Open-Rotor (CROR) engines and the much stronger tonal content their spectra contain may require new unconventional metrics, which fully capture the individual characteristics and complexities of aircraft noise. The focus of this paper shall be on the annoyance aspect of aircraft noise rather than solely on intensity and how this annoyance could be incorporated and minimized during conceptual aircraft design. The research builds on the previous research into aircraft noise annoyance at RWTH Aachen where the sound quality metrics of loudness and tonality were compared to the more conventional metrics dBA, PNL, PNLT and EPNL for standard and noise abatement aircraft procedures. The same approach shall now be applied to aircraft and engine design parameters. It will be seen what influence various design parameters such as number of fan blades and stator vanes, fan tip design Mach number, primary and secondary jet areas, wing span and wing area among others, have on the annoyance caused by aircraft noise via the sound quality metrics of loudness, tonality and sharpness. This will be done using the ILR Noise Simulation and Assessment module INSTANT. A comparison will be made for the currently used conventional metrics, to see if the sound quality metrics capture more information than dBA and EPNdB both for community as well as certification noise assessment. Also, an attempt shall be made for minimal aircraft noise annoyance optimization during conceptual design, via a reduced tonality variant of selected aircraft, using the conceptual aircraft design and optimization environment MICADO of the ILR. The research in this paper is intended as a follow-up to the work carried out for the interdisciplinary internal RWTH Aachen project – Virtual Air Traffic System Simulation (VATSS) which had the aim of making aircraft noise more easily communicable via auralization and 3D visualization of air-traffic.

17 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of traffic noise level, community size, and socio-economic status on human responses to traffic noise was investigated in a controlled manner determined by subject selection procedures.

17 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202386
2022103
202152
202051
201980
201878