A multifunctional ultra-thin acoustic membrane with self-healing properties for adaptive low-frequency noise control.
A multifunctional ultra-thin acoustic membrane with self-healing properties for adaptive low-frequency noise control.
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DOI：
10.1038/s41598-022-22441-4
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发表时间：
2022-10-22
影响因子：
4.6
通讯作者：
中科院分区：
文献类型：
--
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本文提出了一种新型的多功能超薄膜的基础上，聚硼氢化物为基础的凝胶与刺激响应的声音吸收和声音传输损耗（STL），并具有良好的自我修复性能。这种自适应行为是膜的聚合物网络中的动态激活相变的结果，该动态激活相变由与行进的声压波的相互作用给出。通过振荡流变测量研究了材料中这种相变的存在和程度，表明通过改变聚合物中的硼含量来控制动态响应的可能性。在不同的刺激反应进行的声学分析表明，高和动态吸收（95%）的吸收系数峰值和自适应转移到较低的频率，而声音振幅增加。观察到在500至1000 Hz之间的频率范围内的平均STL高达27 dB，并且随着激励幅度的增加，测量到超过2 dB的增加的STL。结果表明，新膜可用于开发具有独特特性（吸收波长为1/54，STL为1/618）的深亚波长吸收体，能够响应外部刺激调节其性能，同时由于其自我修复能力，在损坏的情况下自主恢复其性能。
This paper proposes a novel multifunctional ultra-thin membrane based on a Polyborosiloxane-based gel with stimuli-responsive sound absorption and sound transmission loss (STL) and characterised by excellent self-healing properties. This adaptive behaviour is the result of a dynamically activated phase transition in the membrane’s polymeric network which is given by the interaction with the travelling sound pressure wave. The presence and the extent of such phase transition in the material was investigated via oscillatory rheological measurements showing the possibility to control the dynamic response by modifying the Boron content within the polymer. Acoustic analyses conducted at different stimuli responses showed high and dynamic absorption (95%) at the absorption coefficient peaks and an adaptive shift to lower frequencies while sound amplitudes were increased. An average STL up to 27 dB in the frequency range between 500 to 1000 Hz was observed and an increased STL above 2 dB was measured as the excitation amplitude was increased. Results demonstrated that the new membrane can be used to develop deep subwavelength absorbers with unique properties (1/54 wavelength in absorption and 1/618 in STL) able to tune their performance in response to an external stimulus while autonomously regaining their properties in case of damage thanks to their self-healing ability.
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