Data-Driven Position and Stiffness Control of Antagonistic Variable Stiffness Actuator Using Nonlinear Hammerstein Models
In this paper, an optimal PID controller is introduced for an antagonistic variable stiffness actuator (AVSA) based on Hammerstein models.A set of Hammerstein models is developed for the AVSA using the voltage difference method.For each stiffness level, linear and Gift Pack nonlinear Hammerstein models are identified using the least squares method.