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Infinite Beamforming: Wavenumber Decomposition of Surface Pressure Fluctuations

Haxter, Stefan and Spehr, Carsten (2014) Infinite Beamforming: Wavenumber Decomposition of Surface Pressure Fluctuations. Berlin Beamforming Conference 2014, 19. - 20. Feb. 2014, Berlin, Germany.

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Official URL: http://bebec.eu/

Abstract

The fluctuating pressure field underneath a turbulent boundary layer can lead to excitation of the surface structure of airplanes, trains and cars. At high flow speeds, this excitation becomes a major noise source in the vehicle interior. In the past, the characteristics of this excitation have been measured by the DLR in wind tunnels and in flight tests. A beam forming technique using planar waves was used as wavenumber decomposition in order to analyze the pressure fluctuations present over an installed microphone array. The information contained in the wavenumber spectrum resulting from the analysis is essential when empirically modeling the excitation behavior of a surface exposed to a pressure field. Speed, direction, and propagation mechanism (acoustic or hydrodynamic) of pressure waves can be determined from the position of sources in the wavenumber domain. This makes the wavenumber decomposition a helpful tool for the characterization of source mechanisms. In this paper, a summary of the test results is given. The attributes and potential of the wavenumber decomposition are emphasized in particular.

Item URL in elib:https://elib.dlr.de/85725/
Document Type:Conference or Workshop Item (Speech)
Additional Information:BeBeC-2014-04
Title:Infinite Beamforming: Wavenumber Decomposition of Surface Pressure Fluctuations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haxter, StefanStefan.Haxter (at) dlr.deUNSPECIFIED
Spehr, CarstenCarsten.Spehr (at) dlr.deUNSPECIFIED
Date:2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-10
Series Name:Conference Proceedings on CD-ROM
Status:Published
Keywords:wavenumber spectrum, wavenumber decomposition, planar wave beamforming, separation of acoustic and hydrodynamic pressure fluctuations
Event Title:Berlin Beamforming Conference 2014
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:19. - 20. Feb. 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:31 Mar 2014 14:58
Last Modified:19 Feb 2015 16:23

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