A five-bar finger mechanism involving redundant actuators: Analysis and its applications

Abstract

Analysis and useful applications of redundant actuation are addressed in this work, A five-bar finger mechanism driven by redundant actuators is given as an illustrative example. It is shown that judicial choice of the location of one redundant actuator greatly enhances the load handling capacity of the system, when compared to those of minimum actuation and more than two redundant actuation, Also, methodologies for stiffness and motion frequency modulations via redundant actuation are investigated in this work. Internal load distribution associated with the stiffness and motion frequency modulations is further discussed. Specifically, the motion frequency of the system is modulated by employing inertial and the spring-like impedance properties created by internal loading, The motion frequency as well as the amplitude of oscillation can be actively adjusted during the motion, and the equilibrium position about which the vibration occurs can also be arbitrarily changed during the motion. Furthermore, using the stiffness modulation capability, a point-to-point motion can be accomplished by a progressive movement of equilibrium posture, which is termed as a virtual trajectory. To show the effectiveness of the proposed algorithms, several simulation results are illustrated.