Page 40 - MSAM-1-4

Materials Science in Additive Manufacturing

ORIGINAL RESEARCH ARTICLE
Experimental and numerical studies on the

acoustic performance of simple cubic structure
lattices fabricated by digital light processing

Zhejie Lai, Miao Zhao, Chong Heng Lim, Jun Wei Chua*

Department of Mechanical Engineering, National University of Singapore, 117575, Singapore

Abstract

Sound absorption is one of the important properties of porous materials such
as foams and lattices. Many mathematical models in the literature are capable of
modeling the acoustic properties of lattices. However, appropriate models need
to be chosen for specific lattice structures on a case-by-case basis and require
significant experience in acoustic modeling. This work aims to provide simplified
insights into different mathematical models for the simple cubic lattice. The strut
lengths and radii of the unit cells were varied, and the sound absorption properties
were measured using an impedance tube. The sound absorption coefficients of the
lattices generally increased and exhibited more resonant-like behavior as the strut
radius increased. The Delany-Bazley (DB) model and the multi-layered micropore-
cavity (MMC) model were used to simulate the acoustic properties of the lattices.
*Corresponding author: The correction factors in the MMC were calculated based on empirical relations
Jun Wei Chua fitted using experimental data of the design geometry parameters. Results show
(chua.junwei@u.nus.edu) that the DB model was able to model the sound absorption coefficients for lattice
Citation: Lai Z, Zhao M, Lim CH, samples with porosities as low as 0.7, while the MMC with resonator theory is a
et al., 2022, Experimental and more appropriate acoustics approach for lattices with porosities lower than 0.7. This
numerical studies on the acoustic
performance of simple cubic work will be highly useful for materials researchers who are studying the acoustic
structure lattices fabricated by properties of novel porous materials, as well as manufacturers of acoustic materials
digital light processing. Mater Sci interested in the additive manufacturing of lattice structures for sound absorption
Add Manuf, 1(4): 22.
https://doi.org/10.18063/msam.v1i4.22 and insulation applications.
Received: October 6, 2022
Keywords: Lattice structures; Sound absorption; Delany-Bazley model; Transfer matrix
Accepted: October 28, 2022
method; Resonance
Published Online: November 17,
2022
Copyright: © 2022 Author(s).
This is an Open Access article 1. Introduction
distributed under the terms of the
Creative Commons Attribution Porous materials have become a desired type of materials in several fields, such as sound
License, permitting distribution, [1-5]
and reproduction in any medium, absorption and insulation , heat exchange, chemical processing, bioengineering, and
[3]
provided the original work is energy storage , due to their specific properties, including lightweight, high specific
properly cited. surface area, low bulk density, and microstructure controllability [6,7] . The lattice is one of
Publisher’s Note: AccScience the three types of porous structural categories, which is an ordered and location-specific
Publishing remains neutral with structure that repeats the unit cell in a certain manner. In addition, the research of the
regard to jurisdictional claims in theories and optimization of lattice are developed due to the additive manufacturing
published maps and institutional
affiliations. (AM) processing that emerged, which makes lattice fabrication possible.

Volume 1 Issue 4 (2022) 1 https://doi.org/10.18063/msam.v1i4.22