Adaptive sliding mode control for uncertain Euler-Lagrange systems with input saturation. (English) Zbl 1472.93021
Summary: In this paper, the tracking control problem of uncertain Euler-Lagrange systems under control input saturation is studied. To handle system uncertainties, a leakage-type (LT) adaptive law is introduced to update the control gains to approach the disturbance variations without knowing the uncertainty upper bound a priori. In addition, an auxiliary dynamics is designed to deal with the saturation nonlinearity by introducing the auxiliary variables in the controller design. Lyapunov analysis verifies that based on the proposed method, the tracking error will be asymptotically bounded by a neighborhood around the origin. To demonstrate the proposed method, simulations are finally carried out on a two-link robot manipulator. Simulation results show that in the presence of actuator saturation, the proposed method induces less chattering signal in the control input compared to conventional sliding mode controllers.
MSC:
| 93B12 | Variable structure systems |
| 93C40 | Adaptive control/observation systems |
| 93C41 | Control/observation systems with incomplete information |
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