Inverse dynamics of wire-actuated parallel manipulators with a constraining linkage

The inverse dynamics of wire-actuated parallel manipulators with a constraining linkage and redundancy in actuation is investigated. To resolve the problem of having infinite solutions for inverse dynamics, a wire deactivation methodology based on Lagrangian equations is proposed and two approaches are developed to detect the counteracting wires. The methodology results in lower actuator forces/torques by reducing the counteracting wire tensions. The robustness of the methodology in avoiding negative wire tensions is verified in the inverse dynamic simulation of an example manipulator.