This paper analyzes the possibility of increasing the acoustic transmissionloss of sound transmitted through planar or curved glass shells using attachedpiezoelectric macro fiber composite (MFC) actuators shunted by active circuitswith a negative capacitance. The key features that control the soundtransmission through the curved glass shells are analyzed using an analyticalapproximative model. A detailed analysis of the particular arrangement of MFCactuators on the glass shell is performed using a finite element method (FEM)model. The FEM model takes into account the effect of a flexible frame thatclamps the glass shell at its edges. A method is presented for the activecontrol of the Young's modulus and the bending stiffness coefficient of thecomposite sandwich structure that consists of a glass plate and the attachedpiezoelectric MFC actuator. The predictions of the acoustic transmission lossfrequency dependencies obtained by the FEM model are compared with experimentaldata. The results indicate that it is possible to increase the acoustictransmission loss by 20 and 25 dB at the frequencies of the first and secondresonant modes of the planar and curved glass shells, respectively, using theeffect of the shunt circuit with a negative capacitance.
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