The effects of joint flexibility on robot motion control based on joint torque positive feedback

Author

Hashimoto, Minoru ; Horiuchi, Toshiro ; Kiyosawa, Yoshihide ; Hirabayashi, Hideki

Author_Institution

Dept. of Mech. Eng., Kagoshima Univ., Japan

fYear

1991

fDate

9-11 Apr 1991

Firstpage

1220

Abstract

When positive feedback of joint torques is applied to the motion control of robot arms, the nonlinear dynamic couplings between links are canceled and a servo system with high stiffness is obtained. The problems which arise due to joint flexibility in robot motion control based on joint torque positive feedback are discussed. The effects of joint flexibility are investigated by numerical and experimental studies on a one-link arm with a harmonic drive. It is shown that the joint flexibility destabilizes the control system with joint torque positive feedback. A low-pass filter is used in the torque feedback loop to improve the oscillation characteristics of the control scheme

Keywords

distributed parameter systems; feedback; large-scale systems; low-pass filters; position control; robots; stability; destabilization; harmonic drive; high stiffness; joint flexibility; joint torque positive feedback; joint torques; low-pass filter; nonlinear dynamic couplings; one-link arm; oscillation characteristics; robot motion control; servo system; Couplings; Feedback; Manipulators; Motion control; Nonlinear dynamical systems; Power harmonic filters; Robot control; Robot motion; Servomechanisms; Torque control;

fLanguage

English

Publisher

ieee

Conference_Titel

Robotics and Automation, 1991. Proceedings., 1991 IEEE International Conference on

Conference_Location

Sacramento, CA

Print_ISBN

0-8186-2163-X

Type

conf

DOI

10.1109/ROBOT.1991.131778

Filename

131778