Low‐Frequency Broadband Vibration and Noise Reduction Performance of Metamaterial Plates Based on Series‐Parallel Resonators

To address the difficulty in attenuating low‐frequency elastic and acoustic waves due to their long wavelengths, traditional vibration and noise reduction approaches rely on the mass law, which requires increasing the structural size and weight, thereby limiting their application scope. Moreover, most existing metamaterial studies focus on either vibration reduction or noise insulation alone. In this paper, series‐parallel resonators are combined to achieve a 65% bandgap coverage below 300 Hz. The vibration and acoustic characteristics of the structure are analyzed through finite element simulations. The results show that within the bandgap frequency range, both vibration response and noise radiation are significantly suppressed. Furthermore, the vibration transmission loss, sound power level, and sound insulation performance of the finite periodic structure under different boundary conditions are investigated. The structure maintains excellent vibration and noise reduction performance within the bandgap range, and the boundary conditions have no significant effect on its vibration and acoustic performance within the bandgap. This study demonstrates the potential of series‐parallel resonator metamaterials in low‐frequency vibration and noise reduction applications.