The acoustic properties of natural fiber-reinforced composites should be identified before using these materials in various engineering applications including sound and vibration isolation. This study investigates the effects of sample thickness and fiber/resin ratio on the acoustic performance of jute and luffa fiber-reinforced biocomposites. For this purpose, jute and luffa composite samples with different thicknesses and fiber/epoxy ratios are manufactured and their sound absorption

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... nts (SACs) and transmission losses (TLs) are determined using impedance tube method. Thicknessdependent tendencies of the SACs and TLs of jute and luffa composites for low-, medium-, and high-frequency ranges are identified. The effect of fiber/ epoxy ratio on the acoustic properties of jute and luffa composites as a function of frequency are determined. Furthermore, the SACs and TLs of some natural fiber-based samples with different thicknesses are predicted using mathematical models and the theoretical and experimental results are compared and evaluated. 摘要 在将天然纤维增强复合材料用于各种工程应用(包括隔声和隔振)之前, 应确定其声学特性. 研究了样品厚度和纤维树脂比对黄麻和丝瓜纤维增强 生物复合材料声学性能的影响. 为此, 制备了不同厚度和纤维/环氧树脂比 的黄麻和丝瓜复合材料样品, 并用阻抗管法测定了它们的吸声系数 (SACs)和传输损耗(TLs). 确定了黄麻和丝瓜复合材料在低频、中频和 高频范围的SACs和TLs随厚度的变化趋势. 研究了纤维/环氧树脂比对黄麻 和丝瓜复合材料声学性能的影响. 利用数学模型预测了不同厚度天然纤维 样品的SACs和TLs, 并对理论和实验结果进行了比较和评价.