面内压电振动能量采集动力学设计与性能研究

压电振动能量采集将环境中普遍存在的机械能转换为电能，可以实现自供能传感、控制与驱动，具备灵活、节能环保、可持续的优势，具有广阔的应用前景。为了促进压电振动能量采集器件的集成与融合，提出面内压电振动能量采集，将压电振动能量采集器进行扁平化设计，使其在二维平面内采集振动能量，在保证较大功率输出下能够显著减小器件所需三维空间。为了提高输出功率与工作频宽，设计了具有双稳态与力放大机制的面内压电振动能量采集器。考虑弯张小变形，通过能量法建立了面内压电振动能量采集器的机电耦合动力学模型。分析了关键设计参数对面内压电振动能量采集器性能的影响。数值仿真了面内压电振动能量采集器在简谐激励下的俘能性能，结果表明，通过合理的设计，面内压电振动能量采集器可以低频、宽频弱激励下有效俘获能量。面内压电振动能量采集设计方法有利于推动便携式、可穿戴式自供能等方面的应用和产业化。

Dynamic design and performance study of in-plane piezoelectric vibration energy harvesting

Piezoelectric vibration energy harvesting, which converts energy of the mechanical motions and vibrations that are commonly available in the surrounding environment to electrical energy, can realize self-power sensing, control and actuation. With the advantages of convenience, energy saving, eco-friendliness and sustainability, it has broad application prospects in the fields of aerospace, biomedical engineering, environmental monitoring and military engineering. In recent years, a lot of efforts have been made in piezoelectric vibration energy harvesting. There is still a long way to go to practical application. One of the key issues is the integrated design of the energy harvester. To facilitate the integration of piezoelectric energy harvesting devices with other small electromechanical systems, in-plane piezoelectric vibration energy harvesting is proposed. The piezoelectric vibration energy harvester is designed to be flat and harvest vibration energy in a two-dimensional plane, which can significantly reduce the three-dimensional space with a large power output. An in-plane piezoelectric vibration energy harvester with bistable and force amplification mechanism is designed to improve output power and working bandwidth. These structures can be carved by laser on a flat plate. The deformation and stress of the structures are analyzed. The electromechanical coupling dynamics model of the in-plane piezoelectric vibration energy harvester is established by the energy method. The influences of key design parameters on the performance of the in-plane piezoelectric vibration energy harvester are analyzed. Equivalent piezoelectric coefficient, bistable potential well depth and width can be adjusted by changing design parameters. The dynamic responses of the in-plane piezoelectric vibration energy harvester under harmonic excitation of different accelerations and frequencies are numerically simulated. The results show that the in-plane piezoelectric vibration energy harvester can effectively harvest energy under low frequency weak excitation and wide frequency range through reasonable design. The in-plane piezoelectric vibration energy harvesting design method is conducive to the application and industrialization of portable, wearable self-powered devices.