Abstract
Experimental investigations of flow-induced noise and the resulting interior acoustics are presented. The turbulent flow field next to the side window results in sound sources and, consequently, in the radiation of sound. The combination of these sound pressure fluctuations and the hydrodynamic wall-pressure fluctuations excites the side window and results in radiation of noise into the passenger cabin. To investigate these physical effects, a simplified model of an automobile was set up. The whole model is insulated acoustically in such a way that noise radiation to the interior is limited to the side window. To modify the flow around the model, a square bar at the a-pillar or a side mirror model was mounted. A microphone at the position of the driver’s ear detected the sound radiation to the interior. In order to quantify excitation of the side window, phase-resolved laser-scanning vibrometer measurements were performed. Furthermore, unsteady pressure measurements were carried out at the window surface. The investigations led to a better understanding of the physical mechanism of flow-induced sound generation and also the contribution of sound sources to the interior acoustics.
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Financial support by the Bavarian Research Foundation (BFS) is gratefully acknowledged.
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Müller, S., Becker, S., Gabriel, C., Lerch, R., Ullrich, F. (2014). Flow-Induced Airborne and Structure-Borne Noise at a Simplified Car Model. In: Dillmann, A., Heller, G., Krämer, E., Kreplin, HP., Nitsche, W., Rist, U. (eds) New Results in Numerical and Experimental Fluid Mechanics IX. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-319-03158-3_36
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DOI: https://doi.org/10.1007/978-3-319-03158-3_36
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