Adaptive fixed-time fuzzy fault-tolerant control for robotic manipulator with unknown friction and composite actuator faults. (English) Zbl 1543.93205
Summary: This paper exploits the issue of fixed-time (FT) tracking control (TC) for uncertain robotic manipulator systems (RMS) with composite actuator faults (CAFs), unknown disturbances and joint friction. The fuzzy logic system (FLS) algorithm is introduced to fit the unknown uncertainties including unmodeled parameters, CAFs and joint friction of the RMS, after which a relevant updating algorithm is employed to generate the unidentified boundary of the plant disturbance and FLS approximation error. Then a novel adaptive fuzzy sliding mode (SM) fault-tolerant controller is synthesized, which not only guarantees the boundedness of estimation errors of the involved adaptive parameters, but also actualizes the reachability of the predevised sliding surface. Furthermore, the proof that the system trajectories can achieve the FT convergence to the expected position signals, is then provided on account of the FT stability theory. Ultimately, simulation experiments exhibit the rationality based upon the current control algorithm.
MSC:
| 93C40 | Adaptive control/observation systems |
| 93D40 | Finite-time stability |
| 93C42 | Fuzzy control/observation systems |
| 93C85 | Automated systems (robots, etc.) in control theory |
| 93B12 | Variable structure systems |
Keywords:
robot manipulator; fixed-time stability; sliding mode control; actuator faults; fuzzy control; joint frictionReferences:
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