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Appl. Sci. 2017, 7(10), 1062;

Sound Radiation of Aerodynamically Excited Flat Plates into Cavities

Department of Electrical, Electronic and Communication Engineering, Chair of Sensor Technology, Friedrich-Alexander University Erlangen-Nürnberg, Paul-Gordan-Straße 3/5, Erlangen 91052, Germany
Department of Chemical and Biological Engineering, Institute of Process Machinery and Systems Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstraße 4, Erlangen 91058, Germany
Author to whom correspondence should be addressed.
Received: 22 August 2017 / Revised: 29 September 2017 / Accepted: 7 October 2017 / Published: 14 October 2017
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Flow-induced vibrations and the sound radiation of flexible plate structures of different thickness mounted in a rigid plate are experimentally investigated. Therefore, flow properties and turbulent boundary layer parameters are determined through measurements with a hot-wire anemometer in an aeroacoustic wind tunnel. Furthermore, the excitation of the vibrating plate is examined by laser scanning vibrometry. To describe the sound radiation and the sound transmission of the flexible aluminium plates into cavities, a cuboid-shaped room with adjustable volume and 34 flush-mounted microphones is installed at the non flow-excited side of the aluminium plates. Results showed that the sound field inside the cavity is on the one hand dependent on the flow parameters and the plate thickness and on the other hand on the cavity volume which indirectly influences the level and the distribution of the sound pressure behind the flexible plate through different excited modes. View Full-Text
Keywords: aeroacoustics; flow-excited; vibration; sound radiation; acoustic coupling; turbulent; boundary layer aeroacoustics; flow-excited; vibration; sound radiation; acoustic coupling; turbulent; boundary layer

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Osterziel, J.; Zenger, F.J.; Becker, S. Sound Radiation of Aerodynamically Excited Flat Plates into Cavities. Appl. Sci. 2017, 7, 1062.

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