Abstract
Design of acoustic materials can be achieved through the connection between their geometry and acoustical performance. Here, we propose 3D-printing as an enabling technology that allows us to precisely control an acoustic material’s micro-geometry and orientation, which then eliminates microscopic geometry bias due to conventional manufacturing process, thus realizing precise material characterization at the 3D-printing CAD programming stage. This concept was practiced in the current study focusing on 3D-printing fibrous sound absorbing layers. A fused deposition modeling (FDM) method was applied to produce the fibers. A Tarnow-based airflow resistivity model was implemented together with Johnson-Champoux-Allard and Biot theories for modeling the geometry-performance connection for the fibers. The sound absorption prediction accuracy of the model was validated by E-1050 standing wave tube measurements on the printed sample.
Keywords
Additive manufacturing, 3D printing, Sound absorbing materials, Fibrous materials, Sound absorption, Acoustic impedance, JCA model
Subject
Acoustics and Noise Control
Date of this Version
1-10-2023
Comments
William Johnston, Yutong Xue, Bhisham Sharma and J. Stuart Bolton, “Programable Sound Absorption Performance Enabled by 3D Printing,” Paper 99 in Proceedings of NOVEM 2023, 4 pages, 10-12 January, 2023, Auckland, New Zealand.