Influence of Perforation Angle and Infill Density on Sound Absorption Coefficient of 3D Printed Bio-degradable PLA Panel. Romanian Journal of Acoustics and Vibration, [S. l.], v. 22, n. 2, p. 116–124, 2025. Disponível em: https://rjav.sra.ro/index.php/rjav/article/view/467.. Acesso em: 16 may. 2026.