Monkova Katarina, Vasina Martin, Monka Peter Pavol, Vanca Jan, Kozak Dražan
Faculty of Manufacturing Technologies, Technical University in Kosice, 080 01 Presov, Slovakia.
Faculty of Technology, Tomas Bata University in Zlin, Nam. T.G. Masaryka 275, 760 01 Zlin, Czech Republic.
Polymers (Basel). 2022 Jan 20;14(3):413. doi: 10.3390/polym14030413.
3D printing technique is currently one of the promising emerging technologies. It is used in many areas of human activity, including acoustic applications. This paper focuses on studying the sound reflection behavior of four different types of 3D-printed open-porous polylactic acid (PLA) material structures, namely cartesian, octagonal, rhomboid and starlit structures. Sound reflection properties were evaluated by means of the normal incidence sound reflection coefficient based on the transfer function method using an acoustic impedance tube. In this study, various factors affecting the sound reflection performance of the investigated PLA samples were evaluated. It can be concluded that the sound reflection behavior of the tested PLA specimens was strongly affected by different factors. It was influenced, not only by the type of 3D-printed open-porous material structure, but also by the excitation frequency, the total volume porosity, the specimen thickness, and the air gap size behind the tested specimen inside the acoustic impedance tube.
3D打印技术是目前很有前景的新兴技术之一。它被应用于人类活动的许多领域，包括声学应用。本文着重研究四种不同类型的3D打印开孔多孔聚乳酸（PLA）材料结构，即笛卡尔结构、八角形结构、菱形结构和星光结构的声音反射行为。基于传递函数法，使用声阻抗管通过垂直入射声反射系数来评估声音反射特性。在本研究中，对影响所研究的PLA样品声音反射性能的各种因素进行了评估。可以得出结论，测试的PLA试样的声音反射行为受到不同因素的强烈影响。它不仅受到3D打印开孔多孔材料结构类型的影响，还受到激励频率、总体积孔隙率、试样厚度以及声阻抗管内测试试样后面的气隙尺寸的影响。
