Experimental characterization of 3D-printed sound absorber

Perforated panels have gained much attention due to their acoustic performance. This paper, investigates the technical efficiency of the Multilayer Perforated Sound Absorber (MPSA) composed of perforated panel fabricated by three-dimensional (3D) printing. To this aim, perforated panels have been printed based on the vat photopolymerization method. In detail, standard resin (photopolymer) material was used to print perforated panels with different perforation ratios. In the current study, impedance tube was utilized to evaluate sound absorption performance of the MPSA. In this context, the MPSA was designed by utilizing a perforated panel, a porous material layer, and an air gap behind the panel. By a series of tests, the influence of the perforation ratio, porous material, and air gap on the sound absorption coefficient were determined. The obtained results showed that the perforation ratio and air gap have significant effects on the resonant frequency corresponding to the maximum sound absorption coefficient. The performance of the 3D-printed perforated panels indicated capability of 3D printing in producing high performance sound absorbing panels. The presented data can be used for design, optimization, and development of perforated sound absorbers. Additionally, the achieved results are beneficial for further numerical analysis.

Automated summary

This study investigates the technical efficiency of a Multilayer Perforated Sound Absorber (MPSA) made of 3D-printed perforated panels using vat photopolymerization method, and evaluates its sound absorption performance using an impedance tube. Results show that the perforation ratio and air gap significantly affect the resonant frequency of the maximum sound absorption coefficient.3D-printed perforated panels demonstrate high performance in sound absorption.