Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Use of natural fibers for sound absorption: A chronological literature review
Submission Author:
Flávio Kubota , PR
Co-Authors:
Gabriel Weiss Mattioli, Vinicius Doca, Flávio Kubota
Presenter: Gabriel Weiss Mattioli
doi://10.26678/ABCM.COBEM2023.COB2023-0770
Abstract
With the rapid increase in pollution, sustainability topics have become increasingly valued. Thus, studies exploring natural origin materials are widely esteemed, with sound-absorbing panels as an example. This paper examines relevant publications on natural fibers for sound-absorption purposes and evaluates their technical feasibility by analyzing their sound-absorption coefficients. This paper performs a chronological literature review, investigating natural fibers practicability in the sound-absorption area and summarizes a remarkable body of knowledge, in order to determine which natural fibers can achieve satisfactory results, to then tabulate their Noise Reduction Coefficient, which is a coefficient useful to compare the different materials that absorb sound. The articles gathered and scrutinized in this literature review were selected through databases such as Scopus, Engineering Village, Scholar Google, and ScienceDirect, with the following keywords (within the title, abstract, and keywords fields): natural fibers, acoustic, absorption panel, and sound absorption. For the selection of which natural fibers would be tabulated among the selected scientific articles, the following criteria were applied: (i) the sound absorption coefficient must be obtained experimentally for greater accuracy, (ii) be single-layered, (iii) must not present any added binder, and (iv) have tables or graphs of the sound absorption coefficient by frequencies of at least 250-2,000 Hz. The NRC results revealed low values for banana pseudostem (0.15), cotton (0.30), corn fiber (0.30), and cork (0.30), thus discouraging their use (individually) for sound absorption purposes, although they may be successful by adopting greater thicknesses and other techniques such as microperforated plating, multi-layer, and airspace layer. On the other hand, the NRC results obtained by the remaining absorbent fibers were higher than the previous ones mentioned in the paper, especially the sheep wool (0.70), kenaf (0.70), coconut fiber (0.50), and Betung bamboo (0.50), confirming that those natural fibers are viable options for sound absorption purposes.
Keywords
natural fibers, acoustic absorption, sound absorption, sound absorption coefficient, chronological literature review
