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Acoustical model of vegetal wools including two types of fibers

机译：包含两种纤维的植物羊毛的声学模型

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In the field of biobased materials, vegetal wools present interesting acoustical properties for insulation and absorption purposes in buildings. These materials are characterized by a large dimensional variability of their natural fibers. Moreover, they often include a proportion of polymer fibers in order to ensure the cohesion of the wools, but that may have an influence on their acoustical performances. However, acoustical models have been specially developed and applied to the case of conventional homogeneous fibrous material having homogeneous fibers. In this paper, to optimize the acoustical performances of vegetal wools, a model taking into account two types of fibers (vegetal and polymer) based on a composite Tarnow approach is proposed. This model has been validated by comparison with experimental measurements on two different vegetal wools (flax and hemp). Finally, the interest of the model in the optimization process of acoustical performances of vegetal wools is estimated thanks to simulations of the sound absorption coefficient for a large range of porosities and vegetal fiber radii. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在生物基材料领域，植物毛呈现出有趣的声学特性，可用于建筑物中的隔热和吸收。这些材料的特征在于其天然纤维的尺寸变化很大。此外，它们通常包括一定比例的聚合物纤维，以确保羊毛的凝聚力，但这可能对其声学性能产生影响。然而，声学模型已经被专门开发并应用于具有均质纤维的常规均质纤维材料的情况。在本文中，为了优化植物羊毛的声学性能，提出了一种基于复合Tarnow方法的考虑两种类型纤维（植物纤维和聚合物）的模型。通过与两种不同的植物羊毛（亚麻和大麻）的实验测量值进行比较，已验证了该模型。最后，由于模拟了大范围孔隙率和植物纤维半径的吸声系数，因此可以估算出模型在优化植物羊毛的声学性能方面的兴趣。 （C）2017 Elsevier Ltd.保留所有权利。

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