Investigation on sound absorption properties of kapok fibers |
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Authors: | Hai-fan Xiang Dong Wang Hui-chao Liu Ning Zhao Jian Xu |
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Affiliation: | 1. Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry,Chinese Academy of Sciences, Beijing 100190, China ;Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 2. Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry,Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | Sound absorption properties of natural kapok fibers have been investigated. Kapok fibrous assemblies with different bulk density, thickness, fiber length and orientation were manufactured, and their acoustical performances were evaluated by using an impedance tube instrument. Results show that the kapok fiber has excellent acoustical damping performance due to its natural hollow structure, and the sound absorption coefficients of kapok fibrous assemblies are significantly affected by the bulk density, thickness and arrangement of kapok fibers but less dependent on the fiber length. Compared with assemblies of commercial glass wool and degreasing cotton fibers, the kapok fiber assemblies with the same thickness but much smaller bulk density may have the similar sound absorption coefficients. Theoretical modelling of the acoustical damping performance of kapok fibers shows a good agreement with the experimental data. All the results demonstrate that kapok fiber is a promising light and environment-friendly sound absorption material. |
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Keywords: | Kapok fiber Hollow structure Sound absorption coefficient Bulk density |
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