This study focuses on the application of the meta-lattice structures for the energy conversion enhancement in piezoelectric energy harvesters. Three auxetic patterns are designed aiming at efficient energy conversion and a novel phononic crystal is suggested for the mechanical wave manipulation. Based on the supercell calculations, the bandgap features are extracted on the Irreducible Brillouin Zone. The auxetic patterns are embedded in the perfect crystal to act as a functionalized defect, disturb the periodicity of the perfect crystal, and create several bandpasses over the main bandgaps. The defected supercell is located inside a two-dimensional metaplate to investigate its performance in vibration energy harvesting. Numerical modeling of the metaplate is provided in order to show the energy concentration on the defect location and energy harvesting enhancement. The numerical model is validated by experimental tests. It is found that the Auxetic patterns remarkably enhance the performance of the energy harvesting system between 1.29 and 5.26 times in different designs.

本研究重点关注元晶格结构在压电能量收集器中能量转换增强的应用。针对高效能量转换设计了三种拉胀模式，并提出了一种用于机械波操纵的新型声子晶体。基于超晶胞计算，提取了不可约布里渊区的带隙特征。拉胀图案嵌入完美晶体中以充当功能化缺陷，扰乱完美晶体的周期性，并在主要带隙上产生多个带通。有缺陷的超级电池位于二维元板内，以研究其在振动能量收集方面的性能。提供了金属板的数值模型，以显示缺陷位置上的能量集中和能量收集增强。通过实验测试验证了数值模型。结果发现，在不同的设计中，拉胀模式显着提高了能量收集系统的性能 1.29 到 5.26 倍。