Impedance based combination of visual and force control

In this paper, we propose a simple and efficient control algorithm that combines visual servo control and force feedback within the impedance control approach. The control scheme involves, at the low level, a position based impedance controller with an external force sensor feedback loop. The reference trajectory fed to this impedance controller is generated on line by a vision based control loop. In spite of its simplicity, this approach provides satisfactory experimental behavior. Peg in hole insertion experiments involving large initial errors, are performed using a 7 axis robot manipulator without any computation of the peg trajectory.

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