Reconfigurable inertia-amplified metamaterials for multi-band vibration suppression

Achieving tunable vibration suppression in aeronautical stiffened plates remains a challenging problem. This study proposes a reconfigurable inertial amplification metamaterial stiffened plate (RIAP), in which a reconfigurable curved-beam resonator is integrated with a chiral translational-rotational inertial amplification mechanism to enable tunable multi-bandgap vibration suppression. A theoretical model was established based on energy principles and equivalent stiffness to predict the bandgap range of the RIAP. The predictive capability of this model was validated through experimental measurements and simulations. The findings confirm that the RIAP exhibits dual bandgaps originating from local resonance and inertial amplification mechanisms. These bandgaps can be further tuned to overlap by adjusting the rotation angle φ, enabling broadband vibration attenuation over 100–250 Hz. Furthermore, transmission analysis demonstrates significant vibration attenuation within the predicted bandgap regions, accompanied by a peak-splitting phenomenon caused by resonator-plate coupling. The proposed design provides a compact strategy for low-frequency vibration suppression by combining structural reconfiguration and inertia amplification in stiffened structures.