Consider the manipulator equation of an open-chain \(n\)-DOF robot [1], [2]:
\[ \mathbf{M(q)\ddot{q}+C(q,\dot{q})\dot{q}+g(q)}=\boldsymbol{\tau}_{in} \tag{1} \] The notations are self-explanatory. We assume no external forces applied to the robot.
In this paper, we introduce the concept of