The Equivalence of Second-Order Impedance Control and Proportional Gain Explicit Force Control

International Journal of Robotics Research - Tập 14 Số 6 - Trang 574-589 - 1995
R. Volpe1, Pradeep K. Khosla2
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, 91109
2Department of Electrical and Computer Engineering The Robotics Institute Carnegie Mellon University Pittsburgh, Pennsylvania, 15213

Tóm tắt

This article discusses the essential equivalence of second-order impedance control with force feedback and proportional gain explicit force control with force feedforward. This is first done analytically by reviewing each control method and showing how they mathematically correspond for constrained manipula tor control. For stiff environments the correspondence is exact. However, even for softer environments, a similar response of the system is indicated. Next, the results of an implementation of these control schemes on the CMU DD Arm II are pre sented, confirming the predictions of the analysis. These results experimentally demonstrate that proportional gain force control and impedance control, with and without dynamics compensa tion, have equivalent response to commanded force trajectories.

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