介电弹性体圆柱形驱动器静态特性分析  

Static Characteristic of Dielectric Elastomer Cylindrical Actuator

作　　者：罗华安[1,2] 王化明[1] 游有鹏[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]南京信息职业技术学院机电学院,南京210046

出　　处：《农业机械学报》2012年第9期202-208,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50975139);江苏省自然科学基金资助项目(BK2011735);中国博士后科学基金资助项目(200902684);南京航空航天大学基本科研业务费资助项目(NS2012048)

摘　　要：介电弹性体驱动器的工作条件本质上属于静态操作范围。针对介电弹性体膜材料特性及圆柱形驱动器具体结构对其静态特性的影响,对圆柱形驱动器轴向力的主要影响因素进行了研究。采用超弹性材料Yeoh模型及ABAQUS仿真软件分析了因介电弹性体膜的横向侧边收缩、卷绕后的周向松弛、层间挤压导致的驱动器轴向力变化情况。与实际驱动器的结构尺寸对比表明,驱动器卷绕后的膜层周向松弛对驱动器轴向力影响最大,误差达25.9%,考虑后两项影响因素后计算出的驱动器轴向力与实际误差小于5%;最后对圆柱形驱动器的静态刚度进行了分析,实验结果表明在大位移拉伸时需考虑薄膜滑移因素的影响。Dielectric elastomer actuators are operated in static domain. Aiming at the influence of the material property of dielectric elastomer and the structure of cylindrical actuator on the static characteristic, the main influencing factors on axial force of dielectric elastomer cylindrical actuator were studied. Adopting hyperelastic Yeoh model and simulation software ABAQUS, the axial force change of cylindrical actuator was analyzed under the condition of dielectric elastomer side lateral contraction, circumferential relaxation after convolution and compression between film layers. Compared with the actual actuator dimension, it is found that the circumferential relaxation after convolution is the most influential factor with respect to the axial force of cylindrical actuator, and the error is up to 25.9%. The two latter influence factors were taken into account and the error is less than 5% between the calculated result and the experiment. Finally, the quasi-static stiffness of cylindrical actuators was further studied, and the conclusion was gotten through the experiments that the film layer slippage can not be negligible when cylindrical actuator experiences large displacement.

关 键 词：介电弹性体 圆柱形驱动器 静态特性 准静态刚度 

分 类 号：TP24[自动化与计算机技术—检测技术与自动化装置]