Sound absorption properties of composite structure with activated carbon fiber felts
Sound absorption properties of composite structure with activated carbon fiber felts
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DOI：
10.1080/00405000.2014.899080
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
Yue Shen;G. Jiang
中科院分区：
文献类型：
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作者：
Yue Shen;G. Jiang
研究了不同因素对活性炭纤维毡复合结构吸声性能的影响。将粘胶纤维毡制成活性炭纤维毡，然后与穿孔板组合，形成四种不同的复合吸声结构。基于传递函数法，采用阻抗管测试了复合材料结构在80-6300 Hz频率范围内的吸声系数。分析了活性炭纤维毡的位置、厚度、空气间距等因素对吸声性能的影响。结果表明，复合结构在不同频率下表现出不同的吸声性能。穿孔板在80-3500 Hz频率下通过发生共振在吸声中起主导作用，而多孔材料在3500-6300 Hz频率下贡献最大。在80-3500 Hz频率范围内，随着活性炭纤维位置的变化，第三种复合材料结构的性能最好;第一种复合材料结构与开孔板结构的第一共振频率基本相同，其余三种结构的第一共振频率明显向低频偏移，幅度相同。在较小的厚度范围内，随着活性炭毡厚度的增加，第一种和第二种复合结构的吸声系数均增加，第一种复合结构的第一共振频率与第二种复合结构相比没有明显的低频偏移;但当厚度达到15.6mm时，在80-6300 Hz的声学频率范围内，复合结构的吸声性能与多孔材料的吸声性能相似。随着间距的增加，在80-650 Hz频率范围内吸声性能提高，在650-3500 Hz频率范围内吸声性能下降，第一共振频率向低频方向移动。在3500-6300 Hz频率范围内，随着活性炭纤维毡的位置和气隙距离的变化，吸声系数基本不变;随着厚度的增加，吸声系数提高。
This paper is intended to study the influence of different factors on the sound absorption properties of composite structure with activated carbon fiber felts. Activated carbon fiber felts made from viscose fiber mats were prepared and later combined with perforated panels to form four different composite sound absorption structures. Based on the transfer function method, the impedance tube was used to test the sound absorption coefficients of composite structure in an acoustic range of 80–6300 Hz frequencies. Analysis was made to discuss the influence of such factors on the sound absorption properties as the position of activated carbon fiber felts, thickness, and air space. The results demonstrated that the composite structure displayed different sound absorption properties at different frequencies. Perforated panels played the dominant role in sound absorption by the occurrence of resonance at 80–3500 Hz frequencies, while porous materials contributed the most at 3500–6300 Hz frequencies. At 80–3500 Hz frequencies, the best performance could be observed in the third type of composite structure with changes in the position of activated carbon fiber; the first resonance frequency of the first type of composite structure and perforated panel structure was basically the same, and that of the remaining three types significantly shifted towards the low frequencies with the same scale. In smaller thickness range, with the increase in the thickness of activated carbon fiber felts, sound absorption coefficients of the first and second types of composite structure increased, the first resonance frequency of the first type showing no apparent shift towards the low frequencies compared with what was shown in the second type; but when the thickness arrived at 15.6 mm, sound absorption properties of the composite structure had similar traits to that performed by porous materials in an acoustic range of 80–6300 Hz frequencies. With the increase in the distance of air space, sound absorption properties were improving at 80–650 Hz frequencies but decreasing at 650–3500 Hz frequencies, the first resonance frequency moving towards the low frequencies. At 3500–6300 Hz frequencies, as the position of activated carbon fiber felts and the distance of air space varied, sound absorption coefficients were basically unchanged; while as thickness increased, sound absorption coefficients improved.