Absolute Stability and Robust Discrete Adaptive Control of Multivariable Systems

In this paper, a method is proposed for designing the command feedforward controller for zero phase error tracking control of systems having unacceptable zeros. The unacceptable zeros include both non-minimum phase zeros and lightly damped zeros. In the proposed approach, a digital preview filter along with the acceptable part of the system's inverse model is designed to form the command feedforward controller. Using preview information of the input trajectory, the designed tracking controller guarantees zero phase error and high precision tracking performance. In the proposed design, the best tracking performance can be achieved by minimizing a weighted penalty function, which controls the gain error between the desired output and the actual output. Two design cases were examined. The first is the design based on a uniform weighting function. In this study, the optimal solution of the design can be analytically obtained and three prior approaches were shown to be the special cases of the proposed solutio...

Precision tracking control of non-minimum phase systems with zero phase error

Paper: Adaptive controllers for discrete-time systems with arbitrary zeros: An overview

Deterministic convergence of a Clarke-Gawthrop self-tuning controller

Nonminimum-phase (NMP) processes are frequently encountered in chemical plants, where the presence of right half-plane zeros and time delays often imposes limitations on the achievable control perf...

Novel Multiscale Control Scheme for Nonminimum-Phase Processes

Technical communique: On adaptive minimum variance regulation for non-minimum phase plants

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Technical communique: On adaptive minimum variance regulation for non-minimum phase plants