Decentralized Observer Design or Virtual Decomposition Control

In this article, we incorporate velocity observer design into the virtual decomposition control (VDC) strategy of an n-degree of freedom (N-DoF) open-chain robotic manipulator. Descending from the VDC strategy, the proposed design is based on decomposing the n-DoF manipulator into subsystems, i.e., rigid links and joints, for which the decentralized controller-observer implementation can be done locally. Similar to VDC, the combined controller-observer design is passivity based, and we show that it achieves semiglobal exponential convergence of the tracking error. The convergence analysis is carried out using Lyapunov functions based on the observer and controller error dynamics. The proposed design is demonstrated in a simulation study of a 2-DoF open-chain robotic manipulator in the vertical plane.

Automated summary

This article incorporates the design of a velocity observer into the virtual decomposition control strategy of an N-degree of freedom open-chain robotic manipulator. The proposed design decomposes the manipulator into subsystems, allowing for decentralized controller-observer implementation. The design achieves semi-global exponential convergence of the tracking error.