Toward noise abatement flight procedure design: DLR rotorcraft noise ground footprints model
Yin, Jianping and Buchholz, Heino (2007) Toward noise abatement flight procedure design: DLR rotorcraft noise ground footprints model. Journal of the American Helicopter Society, Volume 52,Issue 2, pp. 90-98. ISSN 0002-8711.
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As a first step towards noise abatement flight procedure design, this paper presents techniques for rotorcraft noise ground footprint prediction developed at DLR, using either purely numerical computations or measured sound fields. When based on purely numerical computations or first-principles, a combination of 3D free wake unsteady panel method and a Ffowcs Williams-Hawkings (FW-H) method is used to provide noise source characteristics on a hemisphere. The noise ground footprints for a BO105 helicopter at 6° descent flight is simulated and compared with flight test data. The noise sources considered are only from a main rotor and tail rotor. When based on measured sound fields from the flight test, a depropagation procedure is used to define the noise source characteristics on the hemisphere. The verification of the depropagation procedure using purely numerical computations is introduced. Two hypothetic noise abatement procedures are simulated based on the RONAP test data.
|Title:||Toward noise abatement flight procedure design: DLR rotorcraft noise ground footprints model|
|Journal or Publication Title:||Journal of the American Helicopter Society|
|In ISI Web of Science:||Yes|
|Volume:||Volume 52,Issue 2|
|Page Range:||pp. 90-98|
|Keywords:||Helicopter Noise, noise abatement procedures,noise ground footprint|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L RR - Rotorcraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L RR - Rotorcraft Research|
|DLR - Research theme (Project):||L - The Quiet and Comfortable Rotorcraft|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology|
|Deposited By:||Dr.-Ing. Jianping Yin|
|Deposited On:||23 Jul 2007|
|Last Modified:||27 Apr 2009 14:05|
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