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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.
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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/ | ||||||||||||
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| 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: |
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| 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 (old) | ||||||||||||
| 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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