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Improving the performance of aeroacoustic measurements beneath a turbulent boundary layer in a wake flow

Spehr, Carsten and Haxter, Stefan (2015) Improving the performance of aeroacoustic measurements beneath a turbulent boundary layer in a wake flow. Journal of Sound and Vibration, 357 (11), pp. 107-127. Elsevier. DOI: 10.1016/j.jsv.2015.07.005 ISSN 0022-460X

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/journal/0022460X

Abstract

A consortium of German automotive manufacturers investigated the noise generated by the air flow around the A-pillar and the side mirror of a generic vehicle model and the noise transmission through the front side window. The DLR was responsible for the optimization of the microphone distribution on the side window and the post processing to distinguish between acoustic and hydrodynamic pressure fluctuations. The distribution of the microphones within the side window was optimized to increase ratio of the main lobe to side lobes with the limited number of microphones and space at hand. A loudspeaker was placed in the side mirror in order to determine the array performance. Wavenumber space was chosen for display as it reveals different characteristics of the pressure fluctuations: acoustic components of the pressure propagate at the speed of sound. They appear inside the acoustic Mach-ellipse. Pressure fluctuations outside this ellipse are regarded as hydrodynamic fluctuations. Their energy is mainly concentrated in the “convective” ridge. Its position represents the convective flow speed.

Item URL in elib:https://elib.dlr.de/95956/
Document Type:Article
Additional Information:Artikel, p. 121, 24. Nov. 2015, http://www.sciencedirect.com/science/article/pii/S0022460X15005787, Available online 6 August 2015
Title:Improving the performance of aeroacoustic measurements beneath a turbulent boundary layer in a wake flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Spehr, CarstenCarsten.Spehr (at) dlr.deUNSPECIFIED
Haxter, StefanStefan.Haxter (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:357
DOI :10.1016/j.jsv.2015.07.005
Page Range:pp. 107-127
Publisher:Elsevier
Series Name:Aeroacoustics research in Europe: The CEAS-ASC report on 2014 highlights
ISSN:0022-460X
Status:Published
Keywords:coherence decay, position on aircraft, in-flight
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:29 Sep 2015 14:46
Last Modified:10 Jan 2019 15:49

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