基于PZT的柴油机振动俘能器的优化设计

Optimization Design of the Diesel Engine Vibration Energy Harvesting Device Based on PZT

为在有限的空间内使基于PZT的柴油机振动俘能器获得最大发电量,建立了柴油机俘能器的能量输出模型,研究单片压电振子厚度、直径等结构参数对发电装置发电能力的影响规律,并用有限元进行验证,为柴油机俘能器压电振子结构参数的优化提供理论依据。研究结果表明:在压电陶瓷片所受应力一定的时候,其上下表面产生的电压大小与压电陶瓷的厚度成正比;在应力一定的情况下压电陶瓷片产生的电荷随着压电陶瓷片振子直径的增加而增加,最终确定了柴油机振动俘能器发电装置内部单个压电陶瓷片振子最优尺寸。

In order to make diesel engine vibration energy harvesting device based on PZT achieve maximum power inside limited space, a model of the power output is established,studying the influence caused by the structure parameters of monolithic piezoelectric such as thickness, diameter and so on ,and testing this with the finite element to provide theoretical basis for the optimization.The results show that when the piezoelectric ceramic piece suffers given stress ,the top and bottom surface of the voltage is directly proportional to the size and the thickness of the piezoelectric ceramic;the charge of piezoelectric ceramic piece increases with the increase of the diameter.Finally the optimal size of a single piezoelectric ceramic vibrator within diesel engine vibration energy harvesting device is determined.