论文期刊

Band-gap tunable dielectric elastomer filter for low frequency noise




作者: Kun Jia,Mian Wang,Tongqing Lu,Jinhua Zhang,Tiejun Wang*
发表/完成日期: 2016-05-18
期刊名称: Smart Materials And Structures
期卷:
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论文简介
In the last decades, diverse materials and technologies for sound insulation have been widely
applied in engineering. However, suppressing the noise radiation at low frequency still remains a
challenge. In this work, a novel membrane-type smart filter, consisting of a pre-stretched
dielectric elastomer membrane with two compliant electrodes coated on the both sides, is
presented to control the low frequency noise. Since the stiffness of membrane dominates its
acoustic properties, sound transmission band-gap of the membrane filter can be tuned by
adjusting the voltage applied to the membrane. The impedance tube experiments have been
carried out to measure the sound transmission loss (STL) of the filters with different electrodes,
membrane thickness and pre-stretch conditions. The experimental results show that the center
frequency of sound transmission band-gap mainly depends on the stress in the dielectric
elastomer, and a large band-gap shift (more than 60 Hz) can be achieved by tuning the voltage
applied to the 85 mm diameter VHB4910 specimen with pre-stretch l0 = 3. Based on the
experimental results and the assumption that applied electric field is independent of the
membrane behavior, 3D finite element analysis has also been conducted to calculate the
membrane stress variation. The sound filter proposed herein may provide a promising facility to
control low frequency noise source with tonal characteristics.
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