TY - GEN
T1 - ADDITIVELY MANUFACTURED MICROLATTICES FOR SOUND ABSORPTION
AU - Li, Xinwei
AU - Zhai, Wei
AU - Yu, Xiang
N1 - Funding Information:
This research is supported by A*STAR under its AME YIRG Grant (Project No. A20E6c0099). Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not reflect the views of the A*STAR.
Publisher Copyright:
© International Institute of Acoustics and Vibration (IIAV), 2022.
PY - 2022/7
Y1 - 2022/7
N2 - The advent of 3D printing brings about the possibilities of microlattices as advanced and novel sound absorbers. Microlattices are defined as periodic cellular solids with submillimeter-sized features (such as struts, shells, or plates) spatially arranged in a three-dimensional manner. Advantages of microlattices over traditional sound absorbers include them being fully designable, customizable, and with the potential for multifunctionalities. Herein, we present an overview and a perspective on the sound absorption properties, their mechanisms, and multifunctionalities of several types of microlattices investigated. The first study focuses on four types of metallic face-centred cubic based plate and truss microlattices. Impedance tube measurements reveal that all of the microlattices display absorption curves with characteristic resonance peaks. Sound absorption mechanisms of microlattices are proposed to be based on the multilayered perforated absorber principle. Characteristics of absorption coefficients are found to be essentially geometry limited by the pore and cavity morphologies. Following this, we have next optimized the pore and cavity geometries for a novel polymeric plate-truss hybrid microlattice for broadband absorption. This structurally optimized structure presents excellent broadband absorption with an averaged experimental absorption coefficient of 0.77 across a broad frequency range from 1000 to 6300 Hz. Extensive simulation and experiments reveal absorption mechanisms to be based on viscous flow, thermal and structural damping dissipations while broadband capabilities to be on multiple resonance modes working in tandem. For their porous nature, the microlattices also dual function as energy absorbers under compressive impact. High specific energy absorptions are revealed for the metallic microlattices, whilst the polymeric one displays high strain recoverability and retains its sound absorption capability. Overall, we present a new concept on the specific structural design and materials selection for microlattices with excellent sound absorbing properties and additional functionalities.
AB - The advent of 3D printing brings about the possibilities of microlattices as advanced and novel sound absorbers. Microlattices are defined as periodic cellular solids with submillimeter-sized features (such as struts, shells, or plates) spatially arranged in a three-dimensional manner. Advantages of microlattices over traditional sound absorbers include them being fully designable, customizable, and with the potential for multifunctionalities. Herein, we present an overview and a perspective on the sound absorption properties, their mechanisms, and multifunctionalities of several types of microlattices investigated. The first study focuses on four types of metallic face-centred cubic based plate and truss microlattices. Impedance tube measurements reveal that all of the microlattices display absorption curves with characteristic resonance peaks. Sound absorption mechanisms of microlattices are proposed to be based on the multilayered perforated absorber principle. Characteristics of absorption coefficients are found to be essentially geometry limited by the pore and cavity morphologies. Following this, we have next optimized the pore and cavity geometries for a novel polymeric plate-truss hybrid microlattice for broadband absorption. This structurally optimized structure presents excellent broadband absorption with an averaged experimental absorption coefficient of 0.77 across a broad frequency range from 1000 to 6300 Hz. Extensive simulation and experiments reveal absorption mechanisms to be based on viscous flow, thermal and structural damping dissipations while broadband capabilities to be on multiple resonance modes working in tandem. For their porous nature, the microlattices also dual function as energy absorbers under compressive impact. High specific energy absorptions are revealed for the metallic microlattices, whilst the polymeric one displays high strain recoverability and retains its sound absorption capability. Overall, we present a new concept on the specific structural design and materials selection for microlattices with excellent sound absorbing properties and additional functionalities.
KW - Additive manufacturing
KW - microlattices
KW - sound absorption
UR - http://www.scopus.com/inward/record.url?scp=85149876710&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85149876710
T3 - Proceedings of the International Congress on Sound and Vibration
BT - Proceedings of the 28th International Congress on Sound and Vibration, ICSV 2022
PB - Society of Acoustics
T2 - 28th International Congress on Sound and Vibration, ICSV 2022
Y2 - 24 July 2022 through 28 July 2022
ER -