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Aeroacoustics research in Europe: The CEAS-ASC report on 2019 highlights, Contribution: Perception-based evaluation of auralized future low-noise aircraft concepts

Pieren, Reto and Bertsch, Lothar and Schäffer, Beat (2020) Aeroacoustics research in Europe: The CEAS-ASC report on 2019 highlights, Contribution: Perception-based evaluation of auralized future low-noise aircraft concepts. Journal of Sound and Vibration, 484 (115540), pp. 18-19. Elsevier. doi: 10.1016/j.jsv.2020.115540. ISSN 0022-460X.

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Official URL: https://doi.org/10.1016/j.jsv.2020.115540

Abstract

To effectively reduce aircraft noise and its impacts on residents around airports, developments of low-noise strategies should consider the perception of sound. To that aim, a comprehensive simulation approach is pre-sented for the assessment and optimization of novel aircraft designs and flight procedures regarding perceived sound. The paper proves its feasibility by an application study on narrow-body twin-engine jet airliners. In this study, the effects of airframe modifications (e.g. landing gear mesh fairing, slat droop nose design, FOPP vortex generators), novel aircraft design, and tailored flight procedures on perceived annoyance are investigated. The key ingredient of the approach is the use of auralization for listening experiences of currently non-existing air vehicle flyovers in a virtual acoustic environment. First, aircraft and flight trajectories are designed. Second, spectral sound emission of each partial source along the flight trajectory is predicted using parametric models. Third, emission sounds are synthesized and propagated to ground-based observer locations with time-varying digital filters that simulate propagation effects such as Doppler effect, atmospheric absorption and turbulence-induced amplitude modulation. Multiple observer locations along the flight path are simulated to represent different expo-sure situations with varying noise source mixtures. The observer signals are spatialized for a hemi-spherical loudspeaker array. This allows listeners to experience the design parameters under varying operational conditions. With a psychoacoustic laboratory experiment, the changes in short-term noise annoyance to different low-noise technologies are measured. Significant annoyance reductions were found for the studied design parameters. Maximum benefit was achieved by the combined modification of the air vehicle and the flight procedure.

Item URL in elib:https://elib.dlr.de/135813/
Document Type:Article
Additional Information:Kapitel 7.2
Title:Aeroacoustics research in Europe: The CEAS-ASC report on 2019 highlights, Contribution: Perception-based evaluation of auralized future low-noise aircraft concepts
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Pieren, Retoreto.pieren (at) empa.chUNSPECIFIED
Bertsch, LotharLothar.Bertsch (at) dlr.dehttps://orcid.org/0000-0003-2780-2858
Schäffer, BeatEmpa, Laboratory for Acoustics & Noise Control, Ueberlandstr. 129, CH-8600 Duebendorf, SwitzerlandUNSPECIFIED
Date:27 June 2020
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:484
DOI :10.1016/j.jsv.2020.115540
Page Range:pp. 18-19
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDElsevierUNSPECIFIED
Publisher:Elsevier
Series Name:Aeroacoustics research in Europe: The CEAS-ASC report on 2019 highlights
ISSN:0022-460X
Status:Published
Keywords:reduced aircraft noise, low noise aircraft design,
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Carter, Beatrice
Deposited On:04 Sep 2020 11:08
Last Modified:16 Jul 2021 09:08

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