Acoustic behaviour of 3D printed titanium perforated panels

Titanium alloys such as Ti6Al4V is amongst the most widely studied metallic materials in broad context of metal 3D printing. Although mechanical performances are well understood, acoustic performance printed Ti6Al4V, and ELI (Extra Low Interstitial) has received limited attention literature. As such, this study investigates normal incidence sound absorption coefficient ( α ) Sound Transmission Loss (STL) both samples manufactured using Selective Laser Melting (SLM). The influence material thickness on responses potential developing micro-perforated panels (MPP) at 400–1600 Hz also explored. three aesthetic perforations a porous back layer was investigated. experimental measurements were carried out an impedance tube following ISO10534-2. result establishes that non-circular featuring back-layer can exhibit improved coefficient. • presented. Effect demonstrated. Perforations cavity acoustics