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Dynamic characteristics of balanced robotic manipulators with joints flexibility

Published online by Cambridge University Press:  09 March 2009

S. B. Lee  and
H. S. Cho
S. B. Lee
Affiliation:
Department of Production Engineering, Korea Advanced Institute of Science & Technology, P.O. Box 150, Chongryangri, Seoul (Korea)
H. S. Cho
Affiliation:
Department of Production Engineering, Korea Advanced Institute of Science & Technology, P.O. Box 150, Chongryangri, Seoul (Korea)
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Summary

The mass balancing of robotic manipulators has been shown to have favorable effects on their dynamic characteristics. In actual practice, however, since conventional manipulators have flexibility at their joints, the improved dynamic properties obtainable for rigid manipulators may be influenced by those joints flexibilities. This paper investigates the effects of the joints flexibility on the dynamic properties and the controlled performance of a balanced robotic manipulator. The natural frequency distribution and damping characteristics were investigated through frequency response analyses. To evaluate the dynamic performance a series of simulation studies of the open-loop dynamics were made for various trajectories, operating velocities, and joint stiffnesses. These simulations were also carried out for the balanced manipulator with a PD controller situated inside the motor control loop. The results show that, at low speed, the joints flexibility does but little influence the performance of the balanced manipulator, but at high speed it tends to render the balanced manipulator susceptible to vibratory motion and yields large joints deformation errors.

Keywords

Joints flexibilityDynamic characteristicsBalanced robotsSimulationsSpeeds
Type
Article
Information
Robotica , Volume 10 , Issue 1 , January 1992 , pp. 25 - 34
Copyright
Copyright © Cambridge University Press 1992

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