Robot Manipulation Using Virtual Compliance Control

Abstract

Experimental results proved that a unified method of impedance control, already presented as virtual compliance control, can make a robot manipulator without any special mechanism perform various patterns of motion, corresponding to the specified software parameters of the control method. Outcomes demonstrated are as follows. (1) The proposed control method can change the characteristics of spring constant and dashpot constant, that is impedance, of 6 degree of freedom (translational: 3 , rotational: 3) of the robot hand. (2) The change of characteristics mentioned above in (1) can be treated equivalently in both translational and rotational. (3) The change of characteristics mentioned above in (1) and (2) can be implemented in real time. (4) The proposed control method can change the characteristics of transient response in velocity control of 6-d.o.f. of the robot hands. (5) The change of characteristics mentioned above in (4) can be treated equivalently both translationally and rotationally. (6) The change of characteristics mentioned above in (4) and (5) can be implemented in real time. (7) The proposed control method can make impedance control applied to one axis, and position control applied to other axis simultaneously, as to 6-d.o.f. of the robot hands. (8) Experimental results mentioned above in (1) - (7) imply the following advantage and disadvantage; advantage: a unified control method that can perform various patterns of motion by specifying software parameters, disadvantage: control response is not necessarily precise that is because proposed control method is base on not dynamics but kinematics.