A nonsingular fast terminal sliding mode controller(NFTSM)is proposed to offset the singularity of control inputs and to shorten the convergence time in traditional terminal sliding mode control methods. The proposed method is composed of the NFTSM manifold and its control law. An exponential function of the system states is introduced into the manifold to accelerate the convergence when the states are far away from the equilibrium point
and a symbolic function is also brought in to ensure the stabilization of the system. Then
a novel sliding mode control law is deduced based on the newly proposed manifold
and is composed of the equivalent control law and the shift control law. The NFTSM control law is proved to be nonsingular and fast convergent in finite time. A mathematical description of the coupled tanks model is presented
based on which the novel NFTSM method is applied to control the water level tracking processing of the coupled tanks
and the NFTSM water level controller is designed. Simulations results show that the tracking process is precisely controlled even with the disturbance and a 25% perturbation in parameters
and that the NFTSM controller is robust.
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references
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