三角形状压电振子压电特性分析与仿真

(压电振子的几何形状是影响其振动发电的重要因素之一。在相同压电材料体积下，三角形压电振子相比于矩形和梯形压电振子具有更大的发电能力。选用悬臂梁式三角形状压电振子作为研究对象，利用有限元分析软件ANSYS进行仿真研究。建立有限元模型；通过静力学和模态分析，研究压电振子的几何形状对其输出电压、固有频率的影响规律，然后在满足原来输出电压不下降的前提下对其进行尺寸优化，提高单位体积的发电能力。在相同边界条件和外力作用下，优化尺寸模型的体积是原来的0.94倍，输出电压是原来的1.03倍，取得了很好的优化效果。

Analysis and Simulation of Vibration Energy Harvesting Behaviors of Triangular Piezoelectric Cantilevers

The geometry of a piezoelectric cantilever beam will greatly affect its vibration energy harvesting ability. In the same volume of piezoelectric materials, the triangular piezoelectric vibrators have more power generation capacity, comparing with the rectangular and trapezoidal piezoelectric vibrators. Selecting a triangular cantilever piezoelectric vibrator as objective, the static and modal analysis were carried out using ANSYS code. The influence of piezoelectric vibrator geometry shape to its output voltage and the natural frequency was studied. Then in keeping the original output voltage, the optimization design of geometry size was carried to enhance the unit volume power capacity. The results show that, in the same boundary conditions and external force, the volume of the optimization size is 0.94 times of the original size, the output voltage of the optimization size is 1.03 times of the original size, and the optimization has a good effect.