On the basis of the theory of variable structure control systems (VSCS) with sliding modes, a new mathematical method for the design of high performance electronic triangular- and parabolic wave generators has been proposed. Theoretically obtained results were verified experimentally using a conservative oscillator controlled by a microprocessor.
In this paper we investigate the performances of four types of variable structure controllers (VSC) both in the undisturbed motion and under the influence of disturbance and noise. Two compared controllers, continuous time VSC (CTVSC) and discrete time VSC (DTVSC) are well known, while discrete time dual rate VSC (DTDRVSC) and fuzzy VSC (FVSC) are new control structures. Digital simulation results presented in this paper clearly show that new controllers in comparison with classical VSC have some real advantages.
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