混合拉伸模式下介电弹性体发电性能研究

Power Generation Performance of Dielectric Elastomers under Mixed Tensile Modes

为探究介电弹性体发电机在等双轴预拉伸和锥形拉伸相结合下的发电特性,采用Neo-Hookean模型建立了介电弹性体在等双轴预拉伸和锥形拉伸情况下的机电不稳定性模型.运用Matlab/Simulink建立了介电弹性体发电机在此混合拉伸下的机电耦合模型,对介电弹性体发电机在不同预拉伸、输入偏置电压和锥形拉伸位移下的能量收集性能进行研究.实验及仿真结果表明:该混合拉伸模式不仅可以有效地改善机电不稳定性的影响,还可以提升介电弹性体发电机的能量收集性能.在预拉伸比为4、施加电压为2.5 k V、锥形拉伸位移为60 mm时,介电弹性体发电机产生的能量为114.49 m J,是相同条件下预拉伸比为2时的4倍.

In order to explore the power generation characteristic of the dielectric elastomer generator under the combination of equal biaxial prestretch and conestretch displacements,combined with the Neo-Hookean model,the electromechanical instability model of dielectric elastomer under the combination of equal biaxial pre-stretch and conical stretch was established.The electromechanical coupling model of dielectric elastomer generator under this mixed tension is established by using Matlab/Simulink,and the energy collection performance of dielectric elastomer generator under diferent prestretch,input bias voltage and conical stretching displacements is studied.The experimental and simulation results show that the hybrid tensile mode can not only efectively improve the influence of electromechanical instability,but also improve the energy collection performance of the dielectric elastomer generator.That is,when the pre-stretching ratio is 4,the bias voltage is 2.5 k V and the conical stretching displacement is 60 mm,the energy generated by the dielectric elastomer generator is 114.49 m J,which is 4 times of that when the pre-stretching ratio is 2 under the same condition.