Performance of a Locally Resonant Metamaterial Plate for Low-Frequency Vibration and Noise Suppression

Aircraft structural vibration and cabin noise critically impact comfort and equipment reliability. Traditional passive and active noise control methods face limitations in the low-frequency range, with issues of added mass or system complexity respectively. To address this issue, this study proposes a novel plate-type acoustic metamaterial unit cell based on the local resonance principle, ingeniously incorporating a compression-torsion coupling effect to generate broadband bandgap characteristics at extremely low frequencies. Using the finite element method with Bloch’s theorem, the structure is shown to exhibit a complete bandgap from 18.792 to 26.267 Hz, yielding a bandwidth of 7.577 Hz. Simulations confirm significant vibration attenuation and sound insulation within this range. A parametric study analyzed the influence of mass block size and linkage stiffness on bandgap properties. On this basis, a lightweight improvement plan was proposed to reduce the unit cell mass by approximately 24%. Experimental vibration transmission tests corroborated the simulation data, verifying the structure’s practical feasibility and effectiveness. This research provides a novel, lightweight metamaterial solution for low-frequency vibration and noise control in applications like aircraft cabins.