The sound insulation capacity of some panels made of polymeric materials manufactured by 3D printing

Abstract

Abstract. The soundproofing of certain spaces is necessary primarily to combat noise pollution generated by high-intensity noise sources. One of the ways to reduce the unwanted propagation of high-intensity sound waves is based on the use of panels made of polymeric materials. The expansion in recent decades of the manufacturing processes of parts by 3D printing has led, among other things, to the identification of ways to change the properties of the materials included in the parts manufactured by 3D printing and to modify, in this way, including the sound insulation properties of such materials. For the development of experimental research aimed at allowing the study of the sound insulation capacity of small panels made by 3D printing from polymeric materials, a relatively simple equipment was designed. Equipment includes an enclosure in which the sound source, the small panel, and the sensor of a device used to evaluate the characteristics of sounds. Experimental tests were carried out on panels made of polylactic acid. The experimental results were mathematically processed with the help of specialized software. An empirical mathematical power function model was determined. This empirical mathematical model highlights the intensity of the influence exerted by the thickness of the panel by the speed and volume of the sounds on the acoustic pressure level. It was found that the strongest influence is exerted by the volume of the sound wave.