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Adaptive control method for nonlinear time-delay processes
Authors:Chen Zonghai  Zhang Haitao  Li Ming  Xiang Wei
Affiliation:Dept.of Automation,Univ.of Science and Technology of China,Hefei 230027,P.R.China
Abstract:Two complex properties,varying time-delay and block-oriented nonlinearity,are very common in chemical engineering processes and not easy to be controlled by routine control methods.Aimed at these two complex properties,a novel adaptive control algorithm the basis of nonlinear OFS(orthonormal functional series) model is proposed.First,the hybrid model which combines OFS and Volterra series is introduced.Then,a stable state feedback strategy is used to construct a nonlinear adaptive control algorithm that can guarantee the closed-loop stability and can track the set point curve without steady-state errors.Finally,control simulations and experiments on a nonlinear process with varying time-delay are presented.A number of experimental results validate the efficiency and superiority of this algorithm.
Keywords:adaptive control  block-oriented nonlinearity  varying time-delay  OFS  Volterra Series.
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