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control inputs

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Adaptive set–point control of robotic manipulators with amplitude–limited control inputs
E. Zergeroglu, W. Dixon, A. Behal, D. Dawson
Journal:

Robotica / Volume 18 / Issue 2 / March 2000

Published online by Cambridge University Press:

01 March 2000, pp. 171-181
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This paper addresses the link position setpoint control problem of n–link robotic manipulators with amplitude-limited control inputs. We design a global-asymptotic exact model knowledge controller and a semi-global asymptotic controller which adapts for parametric uncertainty. Explicit bounds for these controllers can be determined; hence, the required input torque can be calculated a priori so that actuator saturation can be avoided. We also illustrate how the proposed control algorithm in this paper can be slightly modified to produce a proportional-integral-derivative (PID) controller which contains a saturated integral term. Experimental results are provided to illustrate the improved performance of the proposed control strategy over a standard adaptive controller that has been artificially limited to account for torque saturation.