11 April 2017 Investigations on an electroactive polymer based tunable Helmholtz resonator
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A Helmholtz resonator is a passive acoustic resonator classically used to control a single frequency resulting from the cavity volume and the resonator neck size. The aim of the proposed study is to present a new concept and strategy allowing real-time tunability of the Helmholtz resonator in order to enhance acoustic absorption performances at low frequencies (< 500 Hz). The proposed concept consists in replacing the resonator rigid front plate by an electroactive polymer (EAP) membrane. The first proposed strategy consists on a change in the mechanical properties of the membrane resulting from the applied electric field. This induces a resonance frequency shift. A second strategy is based on a well-located spring, which could direct the membrane deformation following the axis of the resonator to obtain a cavity volume variation. Both strategies allow variation of the resonance frequency of the device. Experimental measurements are performed to determine the potential of this concept for improvement of low-frequency performances of the acoustic devices.
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A. Abbad, K. Rabenorosoa, M. Ouisse, N. Atalla, "Investigations on an electroactive polymer based tunable Helmholtz resonator", Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101640P (11 April 2017); doi: 10.1117/12.2259883; https://doi.org/10.1117/12.2259883

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