Abstract
Metamaterials that can tune the bandgap by controlling the configuration have prospects for the security of engineering structures. A configuration-controllable metamaterial is developed in this study to achieve effective vibration reduction, and its bandgap characteristics are investigated through experiments and numerical analysis. The metamaterial specimen is designed and fabricated using silicone rubber. A corresponding experimental platform is constructed to achieve a controllable configuration of the metamaterial. Subsequently, the vibration transmission of the specimen with different deformations is tested. The commercial software COMSOL is used to simulate finite-element dynamic models of the unit cell, and the entire structures of the metamaterial is established to analyze their bandgaps and frequency response characteristics. Both the numerical and experimental results demonstrate that the configuration change can significantly affect the bandgap characteristics. With increasing compression, the existing low-frequency bandwidth of the metamaterial narrow, whereas the high-frequency bandwidth broadens. When the metamaterial deformation is larger, a new bandgap appears at a lower frequency. In addition, the effects of the geometric parameters on the bandgaps are revealed. It shows that the frequency range, width and number of bandgaps of the developed metamaterial can be effectively adjusted through configuration control.
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