Aircraft noise generation and assessment

A flight demonstration for airframe noise reduction technology
  • Kazuomi YamamotoEmail author
  • Kenji Hayama
  • Toshiyuki Kumada
  • Kensuke Hayashi
Original Paper


This article overviews activities and results for an initial flight demonstration of a project, FQUROH, to develop and mature airframe noise reduction technologies. The project aims to demonstrate technologies for reducing airframe noise through three flight tests using aircraft with modified high-lift devices and landing gear. It intends to verify the design methods that utilize advanced computational fluid dynamics (CFD) and the feasibility of practical noise reduction concepts. The main purposes of the initial demonstration using a JAXA’s research aircraft in 2016 were to establish the processes for flight testing, including modification of the aircraft and experimental procedures, as well as to evaluate preliminary noise reduction designs. In the design process, noise reduction concepts for the flap and main landing gear were successfully applied to the actual complex geometries of the aircraft using advanced CFD, and the noise reduction effects were confirmed with noise measurements in wind tunnel tests. Based on the designs, the flap and main landing gear modifications were manufactured and installed on the aircraft. The flight demonstration campaign was successfully carried out with 177 noise source measurements, and encouraging results were obtained that show the feasibility of the noise reduction design method.


Airframe noise Noise reduction Flight test 



Sound pressure level, (dB)


Power spectral density, (dB/Hz)


Perceived noise level, (dB)


A-weighted decibel



The results presented here are due to the efforts of all project team members from JAXA, Kawasaki Heavy Industries, Sumitomo Precision Products and Mitsubishi Aircraft Corporation under the FQUROH collaboration framework. The Cessna Aircraft Company of Textron Aviation generously supported our work by providing the engineering data on our research aircraft, and Diamond Air Service, Calspan and Sumitomo Precision Products made extensive contributions to the aircraft modification works. We would like to express our gratitude to the Japan Civil Aviation Bureau, the administrative office of Noto Airport, the Japan Aviation Academy, and Wajima city. We also express our appreciation to Dr. Patricio A. Ravetta of AVEC for supporting the beamforming analysis software. We would also like to acknowledge the support of IHI Aerospace Engineering, the Kobayashi Institute of Physical Research, and the Propulsion Research Unit of JAXA for noise measurements, as well as the Flight Research Unit of JAXA and Aero Asahi Corporation in operating the aircraft.


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Copyright information

© Deutsches Zentrum für Luft- und Raumfahrt e.V. 2019

Authors and Affiliations

  1. 1.Japan Aerospace Exploration AgencyChofu, TokyoJapan
  2. 2.Aerospace Systems Company, Kawasaki Heavy Industries, Ltd.Kakamigahara, GifuJapan
  3. 3.Sumitomo Precision Products, Co., Ltd.Amagasaki, HyogoJapan
  4. 4.Mitsubishi Aircraft CorporationNishikasugai-gun, AichiJapan

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