Feedback Control of a Two-Input, Two-Output Interacting Process

Use of relay‐feedback test for automatic tuning of multivariable systems

“…From the efficiency point of view, an important question to ask is: do we really need to find out all ( n 2 ) individual transfer functions (gi,s) for the controlled design? The sequential design (Mayne, 1973(Mayne, , 1979Bhalodia and Weber, 1979;Bernstein, 1987;O'Reilly and Leithead, 1991;Leithead and O'Reilly, 1991;Chiu and Arkun, 1992) provides an attractive alternative in MIMO autotuning. By sequential design we mean each controller (in a multivariable system) is designed in sequence.…”

“…The concept of sequential design was proposed in the early 1970s (Mayne, 1973(Mayne, , 1979Bhalodia and Weber, 1979;Bernstein, 1987;O'Reilly and Leithead, 1991;Leithead and O'Reilly, 1991;Chiu and Arkun, 1992). The idea of sequential design is a straightforward one: to treat a n x n multivariable design problem as a sequence of n SISO design problems.…”

“…Unlike the familiar multivariable design methodology in chemical process control, the classical sequential design methods (Mayne, 1973(Mayne, , 1979O'Reilly and Leithead, 1991;Leithead and O'Reilly, 1991) address the problems of variable pairing and the controller design at the same time which make the design procedure complicated. Bhalodia and Weber (1979) and Chiu and Arkun (1992), on the other hand, assume that controller structure (variable pairing) is determined a priori and controller design is carried out sequentially. In this work, only the problem of controller design is addressed and the variable pairing problems are discussed elsewhere (Grosdidier et al, 1985;Yu and Fan, 1990).…”

Robust stability of multi‐loop continuous time self‐tuning controllers

“…These two models have been compared and contrasted in the chemical engineering literature. [23][24][25][26] Either model can be used to describe a particular process, but, depending on the process properties, the one can be more convenient than the other. This is illustrated in the four examples at the end of this section.…”

Prediction of Phase Equilibria in Sour Natural Gas Systems Using the Soave-Redlich-Kwong Equation of State

“…No systematic attempt was made to try to improve on the interactingdesigns, since the focus of this paper is on the stability question. Although the designs could probably be improved somewhat, Bhalodia and Weber (1979) reported that the optima for interacting 2 x 2 feedback designs is reasonably flat.…”