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Experimental and modeling investigation of the acoustic behavior of sustainable kenaf/yucca composites

机译：可持续KENAF / YUCCA复合材料声学行为的实验和建模研究

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The increased awareness of environmental issues has motivated researchers and manufacturers towards the use of natural acoustic absorbers, which are environmentally friendly, sustainable, and relatively cheap. One approach in this direction is to explore the use of waste fibers for potential applications in sound absorption. This study investigates the acoustic behavior of kenaf and yucca waste fiber composites. To this end, yucca and kenaf waste fibers were collected. The separation and extraction of fibers from non-fibrous tissues and woody parts were carried out using the water retting technique. Afterward, yucca and kenaf fibers were blended with a mass ratio of 70:30, 50:50, and 30:70. Polyvinyl alcohol (PVA) was used as the binder to fabricate the composite samples. The acoustic performance of the composites was evaluated using the impedance tube technique. The frequency-dependent absorption behavior of the samples was also investigated using the Delany-Bazley (D-B), Garai-Pompoli (G-P), and Johnson-Champoux-Allard (JCA) models. An in-house developed Matlab code was used for the simulation of the 3D structure of the specimens, and flow resistivity was calculated by simulation of the airflow through the structure. Additionally, tortuosity, viscous, and thermal characteristic lengths were calculated by an inverse technique. It was found that samples of 100% kenaf fibers have the highest flow resistivity values. Flow resistivity decreased with decreasing the kenaf content in the composite samples. It was found that samples of 100% kenaf fibers exhibit promising performance at the low- and mid-frequency bands. A decrease in the amount of kenaf content led to the shift of absorption peak towards the high-frequency region. It was also found that the JCA model closely follows the trend of experimental data for the frequency range of 80-6300 Hz. (C) 2021 Elsevier Ltd. All rights reserved.
机译：增加对环境问题的认识具有激励的研究人员和制造商，用于使用自然声学吸收器，这些吸收器是环保，可持续的，相对便宜的。在这种方向上一种方法是探讨废纤维的使用，以便吸收吸收中的潜在应用。本研究调查了keNaf和yucca废纤维复合材料的声学行为。为此，收集尤卡卡和keenaf废纤维。采用水腐烤技术进行来自非纤维组织和木质部分的纤维的分离和提取。之后，将丝兰和keNaf纤维与70:30,50:50和30:70的质量比混合。使用聚乙烯醇（PVA）作为粘合剂制备复合样品。使用阻抗管技术评估复合材料的声学性能。还使用Delany-Bazley（D-B），Garai-Pompoli（G-P）和Johnson-Champoux-Allard（JCA）模型来研究样品的频率依赖吸收行为。内部开发的MATLAB代码用于模拟样品的3D结构，通过通过结构模拟气流来计算流动电阻率。另外，通过逆技术计算曲折性，粘性和热特征长度。发现100％keNaf纤维的样品具有最高的流动电阻率值。随着复合样品中的keNaf含量降低，流动电阻率降低。发现100％keNaf纤维的样品在低频和中频带上表现出有希望的性能。 kEnaf含量的量降低导致吸收峰朝向高频区域的变化。还发现JCA模型密切关注频率范围为80-6300Hz的实验数据趋势。 （c）2021 elestvier有限公司保留所有权利。

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