Simulation Analysis On Output Performance And Application Research Of Electrically Actuated Dielectric Elastomer Actuator

Dielectric elastomer,as a kind of electroactive polymer,can convert electrical energy into mechanical energy under certain conditions,due to its outstanding performance advantages(large electrical strain,high energy conversion rate,high energy density,light weight,etc),making it the most potential electroactive polymer for making flexible actuator,but there are still many problems to be solved in the application of dielectric elastomer actuator,such as the contradiction between the high dielectric constant of dielectric elastomer materials and electromechanical stability.The difficulty of drive control caused by the viscoelasticity of the dielectric elastomer,the need for high-voltage drive,the preparation of the dielectric elastomer electrically actuated drive,and the poor reliability,etc.These problems have caused the development and application of the dielectric elastomer drive to be greatly affected.Large restrictions,research and resolution of these problems are of great significance.Based on the above problems,the main research contents of this article include:(1)Starting from the study of the electric actuation mechanism of the dielectric elastomer,the specific influencing factors of the driving performance of the dielectric elastomer actuator are analyzed,and the dielectric elastomer under the condition of large deformation is obtained.The method for determining the dielectric constant of the elastomer and the conclusion considering the necessity of the winding film thickness of the driver can effectively improve the accuracy of the theoretical model of the dielectric elastomer actuator.(2)Using the aforementioned methods and conclusions,the superelasticity and viscoelasticity of the cylindrical dielectric elastomer actuator were modeled,and the model was solved using MATLAB to obtain the the rerationship of input voltage and output displacement/force.Analyzing the influence of viscoelasticity on the displacement/force of the actuator.When considering the viscoelasticity of the dielectric elastomer,due to the influence of viscous flow,the calculated theoretical output displacement will be greater than that without considering the viscoelasticity of the material.(3)The cylindrical dielectric elastomer actuator is prepared and experimentally studied.The error between the theoretical calculation output of the actuator and the actual measurement value is compared and analyzed through experimental measurement.The results show that the theoretical calculation value of the theoretical model is closer to the actual measurement under low voltage and get a smaller error.At the same time,theoretical budget and confirmatory experiments are carried out on the effective interval of the drive control of the actuator.(4)Based on two cylindrical dielectric elastomer drivers,a ground mobile trolley is designed.The trolley can realize linear and steering motions.The realization of the linear motion depends on the design of the one-way wheel structure of the trolley;the steering motion of the trolley Rely on the design of the four-bar steering mechanism of the front wheels of the trolley.At the same time,the movement trajectory of the trolley was planned,and the control voltage sequence plan required to complete the movement trajectory of each cylindrical dielectric elastomer actuator was analyzed and determined.