Stability analysis of admittance control using asymmetric stiffness matrix
For robotics researchers working on contact-rich tasks, this work provides a stability proof for a method that extends the stiffness range of admittance control.
This paper proves the stability of admittance control using an asymmetric stiffness matrix for contact-rich tasks, and demonstrates its effectiveness through simulations and experiments.
In contact-rich tasks, setting the stiffness of the control system is a critical factor in its performance. Although the setting range can be extended by making the stiffness matrix asymmetric, its stability has not been proven. This study focuses on the stability of compliance control in a robot arm that deals with an asymmetric stiffness matrix. It discusses the convergence stability of the admittance control. The paper explains how to derive an asymmetric stiffness matrix and how to incorporate it into the admittance model. The authors also present simulation and experimental results that demonstrate the effectiveness of their proposed method.