四边简支板结构的挠电能量采集研究

为了研究正挠电效应在能量采集方面的应用，该文针对四边简支矩形板结构建立了挠电俘能器模型。 首先推导了在点激励作用下四边简支矩形板的动态响应；其次根据正挠电效应建立了由动态应变梯度引起的能量采集理论，并推导出外部负载电阻两端的输出电压与功率表达式；最后分析了不同的参数，如板的模态、激励位置、 挠电片尺寸、厚度与位置及负载电阻等对输出电压与功率的影响。研究结果表明，不同振动模态、贴片位置及挠电片厚度等均影响挠电能量采集的输出功率，该分析结果对优化板结构挠电俘能器的能量输出有实际意义。

Flexoelectric Energy Harvesting Based on Simply Supported Plate

In order to investigate the application of direct flexoelectric effect, a model of flexoelectric energy harvester based on the simply supported flexoelectric plate was established. Firstly, the dynamic response of the simply supported plate was derived when subjected to point loading excitation. Secondly, according to the direct flexoelectric effect, the energy harvesting theory induced by the dynamic strain gradient is established, and the expression of output voltage and power at both ends of the external load resistance are derived. Finally, the effects of different parameters, such as mode shape, point loading excitation location, flexoelectric patch size, thickness and location, and loading resistance and so on, on the output voltage and power were analyzed. The results show that the output power of the flexoelectric energy harvesting was affected by different vibration mode, patch location, flexoelectric patch thickness and so on. The analysis results have practical significance for optimizing the energy output of the flexoelectric electrical energy harvester with plate structure.