To realize effective bandgap regulation, an elastic metamaterial with electromagnetically induced stiffness reconfiguration is proposed. This design achieves programmable migration of low-frequency bandgaps via frequency-feedback control and multistable phase transitions of local resonators. The metamaterial employs a pair of opposing electromagnets, allowing the effective stiffness to be continuously tuned by adjusting both the magnitude and direction of the applied current, thereby achieving active and continuous bandgap migration. Further analysis reveals that, once the repulsive force exceeds a critical threshold, the system undergoes a transition from a monostable to a bistable state. Under small-amplitude excitation, the response is dominated by bandgap shifting, whereas under large-amplitude excitation, inter-well transitions become the primary energy-dissipation mechanism. This nonlinear regime effectively suppresses adjacent resonance peaks and broadens the attenuation bandwidth. Experimental results validate the theoretical model, the feedback control strategy, and the underlying nonlinear tuning mechanism, offering a promising route toward adaptive low-frequency broadband vibration mitigation in time-varying environments.

Jinqiang Li is a professor and doctoral supervisor of Harbin Engineering University, Harbin, China. He received his PhD in Human Mechanical System Design from Hokkaido University in 2013. His research interests include structural vibration and control, smart materials and structural dynamics, acoustic and elastic metamaterials, and nonlinear dynamics. He has published over 40 SCI-indexed journal articles and one academic monograph titled Vibration Control and Optimal Design of Fiber-Reinforced Plate and Shell Structures. As principal investigator, he has undertaken multiple high-level research projects.