Influence of fineness, length and hollow section of fibers on acoustic absorption

A fibrous material is characterized by its fineness, flexibility and high length/fineness ratio and it is used to reduce noise in indoor rooms due to their porous structure. The aim of this work is focused on investigating the structure of two different fibers (acrylic and polyester) from the analysis of the macrostructural parameters, such as fineness, length and cross-section (solid or hollow). Furthermore, the degree of influence of these parameters on the average sound absorption has been investigated. The sound absorption coefficient of fibers is measured at normal incidence in the impedance tube. In acrylic fibers, results showed that the fineness of the fiber has a significant influence on the sound absorption compared to the length of the fiber. In polyester fibers, hollow fibers have a better acoustic behavior compared to solid fibers.

Automated summary

The study focuses on investigating the structural characteristics of two different fibers (acrylic and polyester) and their impact on sound absorption performance. Results show that in acrylic fibers, fineness significantly influences sound absorption compared to fiber length, while in polyester fibers, hollow fibers exhibit better acoustic behavior than solid fibers.