Design of metamaterial with compression-torsion-translation coupling mechanism for low-frequency vibration suppression

Low-frequency vibration suppression remains a pressing challenge in the field of vibration control via metamaterials design. Compression–torsion coupling metamaterials offer notable advantages for low-frequency vibration suppression owing to their distinctive physical properties. However, most compression–torsion coupled metamaterials incorporate coupling of compressional and torsional vibrations, which provides limited low-frequency suppression effectiveness. In order to address the aforementioned problem, this paper proposes a novel compression-torsion-translation coupling metamaterial structure (C-T-TCMS). By incorporating translational vibration into the structural design, a coupling effect among compression, torsion, and translation is achieved. The three-coupling design introduces a new low-frequency vibration attenuation pathway, effectively reducing the transmission efficiency of compression vibrations and thereby enhancing low-frequency isolation performance. In addition, analysis of the vibration transmission characteristics revealed a low-frequency vibration attenuation band (L-FVAB) outside the bandgap range, which further lowered the structure’s initial vibration suppression frequency. Both simulations and experiments demonstrated the low-frequency broadband vibration suppression performance of the proposed compression-torsion-translation coupled metamaterial structure. This study provides a perspective on the design of metamaterial structures for low-frequency vibration suppression based on the compression–torsion coupling mechanism.