Lightweight composite meta-lattice structures with inertial amplification design for broadband low-frequency vibration mitigation

Designing lightweight structures with superior low-frequency vibration attenuation and high mechanical properties remains a significant challenge. Here, we propose a novel design strategy for lightweight meta-lattice sandwich structures that not only exhibit enhanced low-frequency vibration attenuation but also maintain optimal load-bearing performance. By introducing an inertial amplification mechanism, we achieve a broadening effect on the low-frequency bandgap. We develop analytical models based on the Rayleigh-energy method and cantilever-beam equivalence to theoretically predict the dynamic properties. Glass fiber reinforced (GFR) nylon composite meta-lattice sandwich panels are fabricated via selective laser sintering (SLS) 3D printing. A self-developed, fully automated laser-vibration-measurement platform is employed to confirm the significant improvement in broadband low-frequency vibration-reduction performance of the proposed meta-lattice structures. The practical application of a meta-lattice sandwich tube demonstrates its effectiveness in providing low-frequency broadband vibration attenuation and high load-bearing capacity, while maintaining a lightweight design.