基于Neo-Hooken的介电弹性体单轴拉伸发电特性研究

为研究介电弹性体发电机(DEG)在单轴拉伸下的发电特性,结合Neo-Hooken模型建立了DEG在单轴拉伸下的机电耦合数学模型,运用Matlab/Simulink软件建立了DEG的单轴发电仿真模型,对DEG的发电过程及拉伸力、拉伸率、初始电压与电势差之间的关系进行了仿真研究,通过搭建DEG发电测试试验台,进行了试验研究并与仿真结果进行对比。仿真和试验结果表明在单轴拉伸收缩发电过程中,DEG两端电压先降后升;在初始拉伸时和即将拉伸至最大时电压有两个突变点;电势差随着初始电压、拉伸力的增加而近似线性增加。

Power Generating Characteristics of Uniaxial Tensile for DEG Based on Neo-Hooken Model

To study the power generation characteristics of elastomer under uniaxial tensile situation, the mathematical model of dielectric elastomers under uniaxial tensile was established based on Neo-Hooken model, and the corresponding simulation model was set up in Matlab/Simulink environment. The relationships among applied force, stretch rate, initial voltage, and power generation were studied by using the simulation model; the results were compared to the experimental results, and a good agreement was found. Both simulation and experiment results showed that the generating capacity of dielectric elastomer in the power generation process was increased as the applied force, stretch rate, and initial voltage increased. Simulation results were compared with test results, and the main reason was analyzed that the experimental results were lower than the simulation ones: internal resistance of DEG, systemic obstruction, voltage loss of electronic components, measurement error and so on. The experimental results and research conclusions provide a way for later period job of DEG generator, and this study provides the basis for a further study of the power generation by dielectric elastomers, which has good practical value.