Fuzzy control of a class of hydraulically actuated industrial robots

TitleFuzzy control of a class of hydraulically actuated industrial robots
Publication TypeJournal Article
Year of Publication1996
AuthorsCorbet, T., N. Sepehri, and P. D. Lawrence
JournalControl Systems Technology, IEEE Transactions on
Volume4
Pagination419 -426
Date Publishedjul.
ISSN1063-6536
Keywordsactuators, fuzzy control, fuzzy logic controller, hydraulic control equipment, hydraulically actuated industrial robots, industrial robots, instrumented Unimate MK-II industrial hydraulic robot, manipulator, membership functions, off-line routine, optimal control, robots, robustness, simplex method, step responses, two-link hydraulic robot
Abstract

Application of a fuzzy logic controller to a class of hydraulically actuated industrial robots is investigated. A simple set of membership functions and rules are described which meets certain control requirements. An off-line routine based on the simplex method is outlined to tune the controller gains for an optimum response. The fuzzy control gains are tuned by minimizing the summation of absolute position errors over step input responses. The fuzzy logic controller is first examined through simulation of a two-link hydraulic robot of the same hydraulic configuration as many industrial manipulators. The controller has positive aspects which cannot be easily achieved by conventional control techniques. These include a fast rise-time and a well maintained damped response. The fuzzy controller is applied to an instrumented Unimate MK-II industrial hydraulic robot. The experimental results are encouraging in that the best performing control gains are found for different links with a reasonable number of trials and produce step responses with fast response and few oscillations at the set point. The controller demonstrates robustness

URLhttp://dx.doi.org/10.1109/87.508890
DOI10.1109/87.508890

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