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Comparative Assessment of Aircraft System Noise Simulation

Bertsch, Lothar and Sanders, Laurent and Thomas, Russell H. and LeGriffon, Ingrid and June, Jason C. and Clark, Ian A. and Lorteau, Mathieu (2021) Comparative Assessment of Aircraft System Noise Simulation. Journal of Aircraft, 58 (4), pp. 867-884. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.C036124. ISSN 0021-8669.

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Official URL: https://arc.aiaa.org/doi/full/10.2514/1.C036124

Abstract

The Aircraft Noise Working Group (ANSWr) was established by DLR, ONERA, and NASA to compare simulation tools, establish guidelines for noise prediction, and to assess uncertainties associated with the simulation. To accomplish these goals, a benchmark problem was initiated by the group. The benchmark setup is documented and initial results for a reference and a low-noise vehicle are discussed. The reference aircraft is a conventional tube-and-wing configuration with the engines installed under the wings. The low-noise variant features a high wing concept with engines mounted above the wing and fuselage junction. All aircraft noise simulations are performed for departure and approach conditions, and the results obtained with three different system noise prediction tools are compared. For the reference aircraft, the overall agreement is good among the three predictions. Peak noise levels agree within 3-4 dB. Fan and jet component predictions are generally very similar, although there can be differences of up to 7 dB in some fan tone levels. The prediction of airframe components shows the most disagreement among the three methods, with some differences of 6 dB for the major components and greater differences at high frequencies. There can also be differences in the frequency of the peak level and in the rank order of the airframe components. At the total airframe noise level, the differences are reduced to no more than 3-4 dB. While there is general agreement in shape characteristics of predicted ground noise isocontours, the differences among the three methods can result in more significant disagreement in the sizes of the isocontours. For the low-noise vehicle the prediction result is greatly dependent on the acoustic shielding of the engines by the airframe. Consequently, the comparison of the computed results focuses on the acoustic shielding calculations, as well as on the noise source components. Remarkably, all three prediction methods show good agreement with discrepancies typically lower than 4 dB for overall aircraft noise metrics such as peak noise levels. However, at forward and aft angles, the aircraft system noise predicted can begin to show much larger differences, up to 5-10 dB. Many of the differences at large angles can be attributed to the shielding predictions but can also be due to some significant differences among the three predictions of the airframe noise sources.

Item URL in elib:https://elib.dlr.de/133845/
Document Type:Article
Additional Information:eISSN 1533-3868
Title:Comparative Assessment of Aircraft System Noise Simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bertsch, LotharLothar.Bertsch (at) dlr.dehttps://orcid.org/0000-0003-2780-2858
Sanders, LaurentONERA, ChatillonUNSPECIFIED
Thomas, Russell H.NASA, LangleyUNSPECIFIED
LeGriffon, IngridONERA, ChatillonUNSPECIFIED
June, Jason C.NASA, LangleyUNSPECIFIED
Clark, Ian A.NASA, LangleyUNSPECIFIED
Lorteau, MathieuONERA, ChatillonUNSPECIFIED
Date:July 2021
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:58
DOI :10.2514/1.C036124
Page Range:pp. 867-884
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDAIAAUNSPECIFIED
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0021-8669
Status:Published
Keywords:aircraft noise simulation, aircraft noise simulation working group (ANSWr), benchmark test, ANOPP, CARMEN, PANAM
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:13 Jul 2021 16:32
Last Modified:16 Jul 2021 09:17

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