SciELO - Scientific Electronic Library Online

 
vol.17 issue4-7Solubility of carbon dioxide and ethane in lemon oil at elevated pressuresPhenomenological model of the clavulanic acid production process utilizing Streptomyces clavuligerus author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383

Abstract

TRIERWEILER, J.O.; MULLER, R.  and  ENGELL, S.. Multivariable low order structured-controller design by frequency response approximation. Braz. J. Chem. Eng. [online]. 2000, vol.17, n.4-7, pp.793-808. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322000000400042.

The method presented here offers an effective and time saving tool for multivariable controller design. The relation between controller complexity and closed loop performance can easily be evaluated. The method consists of five steps: 1. A desired behavior of the closed loop system is specified. Considering the nonminimum phase part of the process model the closed loop attainable performance is determined. 2. The process model and the attainable performance are scaled by the RPN-scaling procedure. 3. This defines an "ideal" scaled controller, which is usually too complex to be realized. 4. The frequency response of the ideal scaled compensator is approximated by a simpler one with structure and order chosen by the user. 5. Since the approximation in frequency response is performed with the scaled system, it is necessary to return to the original system’s units.

Keywords : low order controllers; multivariable PID-controllers; decentralized controllers; model reduction; RPN.

        · text in English

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License