Abstract
Noise has a negative impact on our environment and human health. For this reason, it is necessary to eliminate excessive noise levels. This paper is focused on the study of the sound absorption properties of materials with open-porous structures, which were made of acrylonitrile butadiene styrene (ABS) material using additive technology. Four types of structures (Cartesian, Octagonal, Rhomboid, and Starlit) were evaluated in this work, and every structure was prepared in three different volume ratios of the porosity and three different thicknesses. The sound absorption properties of the investigated ABS specimens were examined utilizing the normal incidence sound absorption and noise reduction coefficients, which were experimentally determined by the transfer function method using a two-microphone acoustic impedance tube. This work deals with various factors that influence the sound absorption performance of four different types of investigated ABS material’s structures. It was found, in this study, that the sound absorption performance of the investigated ABS specimens is strongly affected by different factors, specifically by the structure geometry, material volume ratio, excitation frequency of an acoustic wave, material’s thickness, and air space size behind the tested sound-absorbing materials.
Highlights
Sound absorption can be defined as a decrement of sound energy upon contact of sound waves with sound absorbing material, such as, e.g., walls, ceilings, floors, or other subjects, which causes the sound to not be reflected back into space [1,2]
acrylonitrile butadiene styrene (ABS) material, which isofmarked as lattice structures made by additive technology from material, which is marked as follows: Firstly, follows: Firstly, the sample specification is given by the geometry of the structure
It can be concluded that the Starlit-shaped specimens made from the ABS material exhibited better
Summary
Sound absorption can be defined as a decrement of sound energy upon contact of sound waves with sound absorbing material, such as, e.g., walls, ceilings, floors, or other subjects, which causes the sound to not be reflected back into space [1,2]. Sound absorption can be a important factor for spaces such as concert venues, cinemas, and theatres and, e.g., for schools, lecture aulas, and for many other materials of daily applications. This became important for various fields of industrial practice, e.g., for the correction of noise that may arise from machines, railroad cars, or computer server array cooling fans in search engines or cloud computing, or for the components belonging to the automotive industry [3,4,5,6]. When sound waves propagate inside a porous material, they pass through the fibers (thin walls) connecting the pores and, as a result of viscous losses, the acoustic energy is converted into heat. The optimum sound absorption coefficient related to an optimum viscous boundary layer thickness of a micro lattice metamaterial has been analyzed by Cai et al [15]
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