The four-tank level control system is a typical control system with nonlinear, coupling and time delays characteristics, and can be used in simulation of multivariate industrial system with nonlinear, time-varying, coupling characteristics, on which the effects of the applications of various control theories on complicated systems can be tested. This paper has analyzed four-tank level control system beginning from mechanism modeling and established nonlinear mathematics model. Through simplifying the nonlinear predictive control algorithm, the mechanism model was proved to be correct in simulation research, the feasibility of the algorithm preliminary was verified, and the basic control requirements were achieved.
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