Dynamic modeling of dielectric elastomer actuators based on thermodynamic theory

Abstract

Dielectric Elastomer Actuator (DEA) shows the complex characteristics such as the inherent nonlinearity, intricate electromechanical coupling, time-dependent viscoelastic behavior, etc., which make it difficult to establish a dynamic model. This paper proposes a dynamic model based on the physical properties of DE materials to describe the above characteristics. The Gent model and the generalized Kelvin model are used to describe the free energy and the viscoelastic characteristics of DEA, respectively. Based on the experimental results, the differential evolution algorithm is used to identify the model parameters. Comparing the experimental data with the model prediction, the validity and generalization of the model are demonstrated.