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This paper deals with a design of a digital servo controller for a robot manipulator with mechanical nonlinearities. The experimental system is a D.C. motor driven manipulator arm. A model to predict the nonlinear behavior exhibited by the experimental system and a nonlinear controller with Coulomb friction compensator are developed and tested. The effectiveness of the nonlinear controller is certified by designing a linear tracking controller based on this scheme. Experimental and simulated responses are given.
Kubo et al. (Wed,) studied this question.