Shape design of 2D metamaterial structure for elastic layer of piezoelectric vibration energy harvester

In this paper, we propose a shape design of 2D metamaterial structure for elastic layer of piezoelectric vibration energy harvester (PVEH). Since the 2D metamaterial structure is the flexibility microstructure, the performance of the PVEH is improved by using it for elastic layer. In order to further improve the power generation performance of the PVEH, we evaluated the mechanical properties of various metamaterial structures. As a result of structural-piezoelectric coupled analysis, strain amount and strain rate of the piezoelectric layer were improved by metamaterial structure consisted of zigzag and liner structures. Therefore, power generation of the designed PVEH was improved compared with the conventional flat plate type elastic layer.