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3D tunable anisotropic metamaterial for low-frequency vibration absorption

By: Contributor(s): Publication details: Stockholm : KTH Royal Institute of Technology, 2021Description: s. 211-215Subject(s): Online resources: In: Proceedings of the Resource Efficient Vehicles Conference – rev2021, 14–16 June 2021Abstract: In the well-known conflict between design space and performance requirements e.g. in terms of noise and vibration insulation, the emergence of new materials exhibiting exceptional insulation properties for a reduced weight or volume increase has received much attention in the last decade. Metamaterials with artificially designed architectures are increasingly considered as new functional materials with unusual properties. This paper presents a group of novel 3D lattice metamaterials for low-frequency vibration absorption. The novel lightweight cellular microstructures for vibro-acoustic metamaterials are designed by modification of the Kelvin cell. Interesting anisotropic material properties are generated by controlling the geometries, e.g., high-stiffness, auxetic, and strong compression-torsional coupling properties. The interesting meta-properties enable to tune the cellular resonators of the structures at a low-frequency range. Previous research is mostly focused on metamaterials for vibration absorption along only one or two directions. In this paper, wide-band high sound absorption properties of energy transfer coupling in all three directions are achieved by tunning the frequency-dependent meta-structures in controlling the geometry and material properties. Additive manufacturing technologies are used for making the 3D complex tunable metamaterials.
Item type: Reports, conferences, monographs
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In the well-known conflict between design space and performance requirements e.g. in terms of noise and vibration insulation, the emergence of new materials exhibiting exceptional insulation properties for a reduced weight or volume increase has received much attention in the last decade. Metamaterials with artificially designed architectures are increasingly considered as new functional materials with unusual properties. This paper presents a group of novel 3D lattice metamaterials for low-frequency vibration absorption. The novel lightweight cellular microstructures for vibro-acoustic metamaterials are designed by modification of the Kelvin cell. Interesting anisotropic material properties are generated by controlling the geometries, e.g., high-stiffness, auxetic, and strong compression-torsional coupling properties. The interesting meta-properties enable to tune the cellular resonators of the structures at a low-frequency range. Previous research is mostly focused on metamaterials for vibration absorption along only one or two directions. In this paper, wide-band high sound absorption properties of energy transfer coupling in all three directions are achieved by tunning the frequency-dependent meta-structures in controlling the geometry and material properties. Additive manufacturing technologies are used for making the 3D complex tunable metamaterials.