Proceedings ArticleDOI
QTD 2 (Quiet Technology Demonstrator 2) Main Landing Gear Noise Reduction Fairing Design and Analysis
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In this article, a Toboggan-shaped main landing gear noise reduction fairing was designed for full-scale flight evaluation on a B777-300ER aircraft in the QTD 2 program.Abstract:
The advances in aircraft engine noise reduction and the increasing demand for quieter aircraft has led noise research to focus more attention on airframe noise. Landing gears and high lift systems have been known to significantly contribute to the total aircraft noise at approach idle conditions, especially in cases where high by-pass ratio engines are used, when noise from the engines is low enough that it could be considered comparable or lower than the noise from the airframe. Landing gears in service on today’s aircraft were not designed with noise impact in mind and contain a myriad of possible noise generating features. Today’s landing gear designer is challenged to consider noise among many other factors when designing efficient aircraft landing gear systems. It is a challenge further complicated if noise reduction solutions are required for retro-fit applications. Much of the experimental noise research conducted on landing system noise has centered around the understanding of noise generating mechanisms and evaluation of noise reduction concepts in model-scale environments such as wind tunnel tests. These experiments have provided valuable insight into landing gear noise sources. However, little effort has been made to integrate noise reduction research with full-scale landing gear design and evaluate noise reduction potential in a full-scale flight environment. The work conducted under the Quiet Technology Demonstrator 2 (QTD2) program marks a first step in the successful integration of noise research with landing gear design with the focus being to design, implement and evaluate noise reduction solutions in a full-scale flight environment. This paper discusses the design and analysis of a ‘toboggan’ shaped main landing gear noise reduction fairing for full-scale flight evaluation on a B777-300ER aircraft in the QTD 2 program. The fairing was selected for flight evaluation after a series of model-scale wind tunnel acoustic experiments were conducted in conjunction with full-scale feasibility studies. The fairing design addressed issues such as gear kinematics and stowing, brake cooling, ground operations and noise reduction potential. The design was supported by static stress analysis and flutter analysis to ensure that the fairing was flight worthy.read more
Citations
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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.
Journal ArticleDOI
Control strategies for aircraft airframe noise reduction
Yong Li,Xunnian Wang,Dejiu Zhang +2 more
TL;DR: In this article, a review of various control methods explored in the last decades for noise reduction on airframe components including high-lift devices and landing gears is summarized, and the potential and control mechanism of some promising active flow control strategies for airframe noise reduction, such as plasma technique and air blowing/suction devices.
Journal ArticleDOI
Experimental assessment of low noise landing gear component design
Werner Dobrzynski,Leung Choi Chow,Malcolm Smith,Antoine Boillot,Olivier Dereure,Nicholas Molin +5 more
TL;DR: An optimal combination of tested gear modifications led to a further noise reduction of up to 8 dB(A) in terms of overall A-weighted noise levels relative to the original advanced gear configuration.
Journal ArticleDOI
Noise reduction technologies for aircraft landing gear-A bibliographic review
TL;DR: A bibliographical review of technologies for landing gear noise reduction, taking the Technology Readiness Level (TRL) into consideration, is presented.
Proceedings ArticleDOI
Screening of Potential Noise Control Devices at Virginia Tech for QTD II Flight Test
TL;DR: In this article, aeroacoustic measurements of a 26-scale, Boeing 777 main landing gear model were conducted in the Virginia Tech Stability Tunnel to perform risk mitigation studies on noise control devices for a flight test performed at Glasgow, Montana in 2005.
References
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Proceedings ArticleDOI
Full-Scale Noise Testing on Airbus Landing Gears in the German-Dutch Wind Tunnel.
Werner Dobrzynski,Heino Buchholz +1 more
TL;DR: In this paper, full-scale landing gears of an A320 aircraft were tested in the German-Dutch wind tunnel and the results showed that aerodynamically generated noise from landing gears turn out to be of broadband nature with constant levels up to several kHz.
Proceedings ArticleDOI
Airframe Noise Source Locations of a 777 Aircraft in Flight and Comparisons with Past Model-Scale Tests
Proceedings ArticleDOI
Microphone array assessment of an isolated, 26%-scale, high-fidelity landing gear
TL;DR: In this paper, an aeroacoustic study of a 26-scale landing gear model was conducted in the NASA Ames 7- by 10-foot wind tunnel using a phased microphone array.
Proceedings ArticleDOI
Research into Landing Gear Airframe Noise Reduction
TL;DR: In this article, a research project was launched aiming at the reduction of landing gear noise, which is the dominant airframe noise component for wide-body aircraft and the subject area of this paper.
Proceedings ArticleDOI
Airframe Noise Results from the QTD II Flight Test Program
Ronen Elkoby,Leon Brusniak,Robert W. Stoker,Mehdi R. Khorrami,Amal Abeysinghe,Jefferey W. Moe +5 more
TL;DR: In this paper, the authors report on an investigation of full-scale landing gear noise measured as part of the 2005 Quiet Technology Demonstrator 2 (QTD2) flight test program.