Recursive control of robot manipulator with elasticity

This paper presents an advanced method for suppressing torsional vibration of a flexible joint which connects a motor shaft and a driven arm. In the proposed method, at first, the position controller is designed on the basis of a model of a rigid arm by a recursive control law. After that, a compensation element is added to increase the stability of the total system, where only motor velocity is used for the purpose. The proposed method realizes a robust control and because of its model-free structure it is easy to implement the proposed algorithm. Experimental results are also presented to show its effectiveness