Spatial impedance control of redundant manipulators

This work is focused on impedance control of redundant manipulators. A spatial impedance formulation is presented where general 6-DOF end-effector tasks can be handled. A singularity-free angle/axis representation of end-effector orientation is used which allows geometric task consistency to be preserved. An inverse dynamics control with a dynamically consistent inverse of the geometric Jacobian matrix is developed with the adoption of an inner loop acting on the end-effector position and orientation conferring robustness to unmodeled dynamics and external disturbances. Stabilization of null-space velocities is ensured and utilization of redundant degrees of mobility is carried out to optimize an additional task function. Experimental results on a seven-joint industrial robot with force/torque sensor are discussed.

[1]  Jan F. Broenink,et al.  A spatial impedance controller for robotic manipulation , 1997, IEEE Trans. Robotics Autom..

[2]  S. Shankar Sastry,et al.  Dynamic control of redundant manipulators , 1989, J. Field Robotics.

[3]  Bojan Nemec,et al.  Force Control of Redundant Robots , 1997 .

[4]  Bruno Siciliano,et al.  Six-degree-of-freedom impedance robot control , 1997, 1997 8th International Conference on Advanced Robotics. Proceedings. ICAR'97.

[5]  L. Zlajpah,et al.  Implementation of force control on redundant robot , 1998, Proceedings. 1998 IEEE/RSJ International Conference on Intelligent Robots and Systems. Innovations in Theory, Practice and Applications (Cat. No.98CH36190).

[6]  Bruno Siciliano,et al.  Six-DOF impedance control based on angle/axis representations , 1999, IEEE Trans. Robotics Autom..

[7]  Il Hong Suh,et al.  Motion/force decomposition of redundant manipulator and its application to hybrid impedance control , 1998, Proceedings. 1998 IEEE International Conference on Robotics and Automation (Cat. No.98CH36146).

[8]  Bruno Siciliano,et al.  Experiments of Spatial Impedance Control , 1997, ISER.

[9]  Wyatt S. Newman,et al.  Augmented impedance control: an approach to compliant control of kinematically redundant manipulators , 1991, Proceedings. 1991 IEEE International Conference on Robotics and Automation.

[10]  Peter K. Allen,et al.  Design of a partitioned visual feedback controller , 1998, Proceedings. 1998 IEEE International Conference on Robotics and Automation (Cat. No.98CH36146).

[11]  Oussama Khatib,et al.  Load Independence of the Dynamically Consistent Inverse of the Jacobian Matrix , 1997, Int. J. Robotics Res..

[12]  Oussama Khatib,et al.  A unified approach for motion and force control of robot manipulators: The operational space formulation , 1987, IEEE J. Robotics Autom..

[13]  Norihiko Adachi,et al.  Compliant motion control of redundant manipulators , 1991, Proceedings IROS '91:IEEE/RSJ International Workshop on Intelligent Robots and Systems '91.

[14]  Luigi Villani,et al.  Experiments of impedance control on an industrial robot manipulator with joint friction , 1996, Proceeding of the 1996 IEEE International Conference on Control Applications IEEE International Conference on Control Applications held together with IEEE International Symposium on Intelligent Contro.