Investigation of a dynamic active/passive noise cancellation of polyborosiloxane thin membrane gel
Investigation of a dynamic active/passive noise cancellation of polyborosiloxane thin membrane gel
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DOI：
10.1117/12.2660857
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发表时间：
2023-04
期刊：
影响因子：
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通讯作者：
Konstantinos Myronidis;G. M. Malfense Fierro;M. Meo;F. Pinto
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文献类型：
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作者：
Konstantinos Myronidis;G. M. Malfense Fierro;M. Meo;F. Pinto
本研究提出了一种基于 PDMS 和硼配方的多功能薄膜凝胶。所提出的凝胶在低频下提供动态被动刺激响应吸声，可以通过使用辅助声源将其转化为主动噪声消除。所提出材料的被动行为是材料聚合物网络中动态相变的结果，由与行进声压波的相互作用激活。通过傅里叶变换红外光谱和振荡流变测量研究了材料中相变的存在和程度，发现凝胶中硼的含量对相变的发生及其声学性能起着至关重要的作用。无源场景结果显示，吸收系数峰值处具有约 80% 的高动态吸收，当声音振幅增加时，该吸收系数会动态转移到较低频率。由于相变的发生是通过引入的声压波主动控制的，因此主动噪声消除在较低频率范围内得到了成功的证明。上述相变加剧，在此过程中消耗能量，从而实现动态噪声消除。这些结果表明，所提出的凝胶膜材料可用于开发具有独特性能的主动/被动深亚波长吸收器，该吸收器可以响应外部刺激动态调整其性能，并且可以使用机械传感器进一步控制/激活。
This study proposes a multifunctional, thin membrane gel based on a formulation of PDMS and boron. The proposed gel offers a dynamic passive stimuli-responsive sound absorption at low frequencies, which can be transformed to active noise cancellation with the use of a secondary sound source. The passive behaviour of the proposed material is the result of a dynamic phase transition in the material’s polymeric network, activated by the interaction with the travelling sound pressure wave. The presence and extent of the phase transition in the material was investigated via Fourier transform infrared spectroscopy and oscillatory rheological measurements, where it was found that the amount of boron in the gel has a crucial role on the occurrence of the phase transition and consequently on its acoustic performance. The passive scenario results revealed a high and dynamic absorption of approximately 80% at the absorption coefficient peaks, which dynamically shifted to lower frequencies while sound amplitudes were increased. The active noise cancellation was successfully demonstrated at the lower frequencies range, as the occurrence of the phase transition was actively controlled via the sound pressure wave introduced. The aforementioned phase transition was intensified, with energy consumed in this process, resulting in a dynamic noise cancellation. These results demonstrated that the proposed gel membrane material can be used to develop active/passive deep subwavelength absorbers with unique properties, which can dynamically tune their performance in response to external stimuli, and that can be further controlled/activated with the use of mechanical transducers.