介电弹性体驱动单元的动态特性分析

针对不同电压载荷情况下介电弹性体驱动单元的动态特性,考虑材料非线性、介电常数变化和惯性效应等因素的影响,从热力学能量转化的角度得到了基于Ogden应变能函数的介电弹性体驱动单元的二阶常微分运动方程,并分析了系统的动态响应及模型几何尺寸的影响。结果表明:介电弹性体驱动单元动态响应的振幅由电场强度决定。在恒定场强下,随着电场强度幅值的增大,驱动单元的振幅将随之增大、振动频率将随之减小;在简谐场强下,随着电场强度频率的增大,驱动单元将发生共振,且共振频率将随电场强度的增大而减小。

Dynamic Behavior Analysis of Dielectric Elastomer Actuating Unit

In order to analyze the dynamic behavior of the actuating unit of dielectric elastomer (DE) under different electric voltage,a second-order ordinary differential motion equation was derived based on thermodynamics and Ogden strain energy function considering the influence of material nonlinearity,dielectric variation and inertial effects.Besides,the dynamic response of the actuating unit was obtained,and the influence of geometry was investigated as well.The results indicate that the dynamic response amplitude of DE actuating unit is determined by the electric field.When increasing the static electric strength,the amplitude increases while the frequency decreases.And when increasing the frequency of harmonic electric strength,the actuating unit shows a resonate effect and the resonant frequency decreases with the increase of harmonic electric strength.