管状弹簧介电薄膜作动器粘弹性变形研究  

Study on the Viscoelasticity Deformation of Tube Spring Dielectric Film Actuator

作　　者：姚广利 王振刚 何天虎[1] Yao Guangli;Wang Zhengang;He Tianhu(School of Science,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学理学院

出　　处：《甘肃科学学报》2019年第6期1-7,共7页Journal of Gansu Sciences

基　　金：国家自然科学基金项目(11372123)

摘　　要：为了研究粘弹性对介电薄膜作动器力电性能的影响,建立了由介电薄膜、轻质弹簧和2个刚性圆盘组成的管状介电薄膜作动器的力学模型。在施加力电载荷后,作动器发生非均匀大变形。采用非平衡热力学推导得到了描述该模型大变形的控制方程,并利用弹簧-阻尼流变模型给出了动力学方程。采用打靶法和改进欧拉法对控制方程及动力学方程进行了数值求解。计算中分别考虑了不同的力电载荷对管状介电薄膜作动器粘弹性行为的影响效应。结果表明,管状介电薄膜作动器的力电性能与时间相关,不同的力电载荷对其力电性能有显著影响。当对介电薄膜施加小的轴力或者电压时,薄膜在经历一段松弛时间后达到新的平衡状态,但如果施加的轴力或者电压超过其阈值,介电薄膜将不会达到平衡,最终介电薄膜将处于失稳状态。所得结果可为理解此类管状介电薄膜作动器的粘弹性行为及其优化设计提供理论指导。In order to study the effect of viscoelasticity on the mechanical electrical performance of dielectric film actuator,a mechanical model of tube dielectric film actuator consisting of dielectric film,lightweight spring and two rigid circular plates was established.After applying mechanical electrical loads,the actuator had great inhomogeneous deformation.The governing equation that describes the big deformation of the model was obtained by using the non-equilibrium thermodynamic derivation,and the kinetic equation was provided by utilizing the spring-damping rheological model.The governing equation and the kinetic equation were solved with shooting method and improved eulerian method.In the calculation,the effect of different mechanical electrical loads on the viscoelastic behavior of tube dielectric film actuator was taken into consideration respectively.The results show that the mechanical electrical properties of tube dielectric film actuator are related to time,and can be greatly impacted by different mechanical electric loads.When a small axial force or voltage is applied to the dielectric film,it reaches a new equilibrium state after a period of relaxation.However,if the applied axial force or voltage exceeds its threshold value,the dielectric film will not level off but be in a state of instability.The results can provide theoretical guidance for understanding the viscoelastic behavior of such tube dielectric film actuator and their optimized design.

关 键 词：介电弹性体 软物质 作动器 粘弹性 打靶法 

分 类 号：O343.5[理学—固体力学]