This paper presents a new metamaterial plate (metaplate) made by a periodic repetition of ‘frame-springs-mass’ systems for vibration isolation. Numerical studies and experimental measurements demonstrate that the proposed structure show a complete 3D phononic bandgap in the low-frequency range. In the numerical computation of the transmission diagram, the self-weight gravity, the material damping, the geometry of the metaplate and different boundary conditions are considered. A prototype of the proposed metaplate, made of Polyamide, is fabricated by means of additive manufacturing and experimentally tested. The measured transmission diagram is in good agreement with numerical predictions, thus proving the proposed design and promoting potential applications such as low-frequency vibration isolation and stress wave mitigation.

本文介绍了一种通过周期性重复“框架-弹簧-质量”系统进行隔振而制成的新型超材料板（元板）。数值研究和实验测量表明，所提出的结构在低频范围内显示出完整的3D声子带隙。在传动图的数值计算中，考虑了自重重力，材料阻尼，金属板的几何形状以及不同的边界条件。拟议的由聚酰胺制成的金属板的原型通过增材制造方法进行了制造并进行了实验测试。实测的传输图与数值预测非常吻合，从而证明了所提出的设计并促进了诸如低频振动隔离和应力波缓解的潜在应用。