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Reduction of Aircraft Noise by Wing Design and Add-On Technologies

Koch, Marc (2021) Reduction of Aircraft Noise by Wing Design and Add-On Technologies. DLR-Forschungsbericht. DLR-FB-2021-23. Dissertation. TU Braunschweig. 130 S.

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As aircraft noise is a major concern for residents living in the vicinity of airports, this thesis investigates the noise reduction capability of a large and heavy tube-and-wing airliner through design modifications employing a simulation study. The planform parameters determine the airplane's flight mechanics and, in turn, influence the ground noise impact. The planform is changed in a parameter study, and low noise techniques, namely fan sound shielding, ultra-high bypass ratio engine, droop nose, trailing-edge brush, and landing gear fairing, are sequentially applied to the airplanes. Their ground noise is evaluated based on the DLR's awakening criterion. Absent of low-noise technologies, the approach speed and the ground track length between the point of break release and the point at which the airplane reached a height of 1200 m are found to be the most important criteria to lower the approach and departure-induced ground noise, respectively. Since the departure-induced ground noise causes the majority of the overall awakening reactions, it dominates the selection process of the optimal airplane design. The application of low-noise technologies influences the airplane's flight performance, which shifts the set of the planform parameter values to achieve the optimal airplane design. In summary, it is shown that the collective consideration of various planform parameters while designing airplanes has been found to be more effective than just the sole application of low-noise technologies to existing airplanes.

Item URL in elib:https://elib.dlr.de/145546/
Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Additional Information:Lizenz: https://creativecommons.org/licenses/by-sa/3.0/de/CC BY-SA 3.0 DE
Title:Reduction of Aircraft Noise by Wing Design and Add-On Technologies
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Koch, MarcUNSPECIFIEDhttps://orcid.org/0000-0002-5922-9104UNSPECIFIED
Date:November 2021
Refereed publication:Yes
Open Access:Yes
Number of Pages:130
Keywords:Aircraft noise prediction, low-noise aircraft, low-noise characteristics, low-noise flight path, conceptual aircraft design, stall speed, climb performance, awakening reactions, FlipNA, PANAM, PrADO, SHADOW, B747-400, four-engine aircraft, long-range aircraft, low drag minimum power, ICAO-A procedure
Institution:TU Braunschweig
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Air Transport Operations and Impact Assessment
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Carter, Beatrice
Deposited On:08 Dec 2021 09:51
Last Modified:05 Jan 2022 14:48

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