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Design approach for an active double-glazed window

: Heuss, O.; Kaal, W.; Klaus, T.B.; Thyes, C.; Tschesche, J.; Karsten, R.

Sas, P. ; Katholieke Universiteit Leuven, Departement Werktuigkunde:
ISMA 2014, International Conference on Noise and Vibration Engineering. Proceedings. CD-ROM : USD 2014, International Conference on Uncertainty in Structural Dynamics; 15 to 17 September, 2014, Leuven, Belgien
Leuven: Katholieke Universiteit Leuven, 2014
ISBN: 978-90-73802-91-9
International Conference on Noise and Vibration Engineering <26, 2014, Leuven>
International Conference on Uncertainty in Structural Dynamics (USD) <5, 2014, Leuven>
Fraunhofer LBF ()

For the active control of structural vibrations, knowledge about the controllability of the actuators is mandatory. To improve the sound transmission properties of double-glazed windows, the coupled dynamics of structure and cavity have to be considered. The radiating pane is isolated from the other one by the compressible gas inside the cavity. Depending on the geometry of the double partitioned walls, the coupled mode shapes may yield to high radiation coefficients because of their special shapes, which are less symmetric than pure structural ones. In order to investigate such phenomena and to find a straightforward design strategy for an actively controlled double-glazed window, an acoustic test stand has been prepared with an asymmetric double-glazed window. Besides an already existing finite element model, this paper describes an analytical model of the coupled system. Numerical and experimental results to determine the efficiency of active systems, regarding the radiated sound power are presented. Finally new concepts for actuators, acting on the fluid are realized and tested. Fully integrated electroactive polymer actuators are designed to act as loudspeakers and adaptive Helmholtz resonators are tested in comparison.