Using natural fibers is a practical method for achieving the best possible levels of both acoustic and thermal comfort in residential and office environments. The present study delves into the investigation of the acoustic and thermal performance of fibrous panels made of Typha Latifolia natural fibers. The specimens were produced in varying thicknesses (ranging from 30 to 50 mm), two distinct densities (150 and 200 kg/m³), and three different binder concentrations (7.5 %, 10 %, and 12.5 %). Acoustic properties were assessed through a combination of experimental impedance tube methodology and mathematical modeling, employing the Johnson-Champoux-Allard-Lafarge (JCAL) and Attenborough models. The Finite Element Method (FEM) within COMSOL software was employed for modeling purposes. To evaluate the insulating properties, the effective thermal conductivity (Keff) was measured in oven-dried and moisture-conditioned circumstances. The outcomes of this investigation revealed the highly favorable acoustic performance of Typha fibers within the frequency range of 63–6300 Hz, with particular effectiveness demonstrated in the critical indoor frequency band of 500–2000 Hz. Moreover, enhancements in sound absorption were observed with increased specimen thickness, airgap, and density, while variations in binder concentration displayed relatively minimal influence. Both the JCAL and Attenborough models exhibited an impressive accuracy rate of approximately 95 % in predicting sound absorption coefficients. The panels demonstrated Keff values spanning from 0.039 to 0.052 W/(mK), suggesting favorable thermal insulation attributes. It was observed that although Keff tends to rise when the samples are subjected to moisture, this elevation lacks statistical significance, suggesting that there is no significant decrease in insulation performance. The panels' performance was also assessed using ODEON software in a multipurpose hall, revealing a notable enhancement in the hall's acoustic properties.

中文翻译：

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Typha Latifolia 纤维板的声学、热学和机械性能：可持续建筑应用的实验评估和建模


使用天然纤维是在住宅和办公环境中实现最佳声学和热舒适度的实用方法。本研究深入研究了由 Typha Latifolia 天然纤维制成的纤维板的声学和热性能。样品具有不同的厚度（从 30 到 50 毫米不等）、两种不同的密度（150 和 200 kg/m³）和三种不同的粘合剂浓度（7.5 %、10 % 和 12.5 %）。通过实验阻抗管方法和数学建模相结合，采用 Johnson-Champoux-Allard-Lafarge （JCAL） 和 Attenborough 模型来评估声学特性。COMSOL 软件中的有限元法 （FEM） 用于建模目的。为了评估绝缘性能，在烤箱干燥和潮湿条件下测量了有效导热系数 （Keff）。这项调查的结果显示，Typha 光纤在 63-6300 Hz 的频率范围内具有非常有利的声学性能，在 500-2000 Hz 的临界室内频段中表现出特别的有效性。此外，随着样品厚度、气隙和密度的增加，观察到吸声增强，而粘合剂浓度的变化表现出相对较小的影响。JCAL 和 Attenborough 模型在预测吸声系数方面都表现出令人印象深刻的约 95% 的准确率。面板显示 Keff 值范围从 0.039 到 0.052 W/（mK），表明具有良好的隔热属性。 据观察，尽管当样品受到潮湿影响时，Keff 趋于上升，但这种升高缺乏统计学意义，表明绝缘性能没有显着下降。在多功能厅中使用 ODEON 软件对面板的性能进行了评估，揭示了大厅声学特性的显着增强。