MODELING AND OPTIMAL CONTROL OF NONSTATIONARY PROCESSES
Main researcher
: KURTANJEK, ŽELIMIR (24881) Assistants
BAUMAN, INGRID (130254)
SINČIĆ, DINKO (78082)
BAUMAN, EGON (2645)
FUTAČ, DRAGUTIN (64736)
RUNAC, DOMAGOJ (184675)
ČURLIN-SABLJIĆ, MIRJANA (900739)
Type of research: basic Duration from: 01/01/91. to 12/30/95. Papers on project (total): 19
Papers on project quoted in Current Contents: 6
Institution name: Prehrambeno-biotehnološki fakultet, Zagreb (58) Department/Institute: Department for Process Engineering Address: Pierottijeva 6, 41 000 Zagreb, CROATIA City: 10000 - Zagreb, Croatia
Communication
Fax: 385 (0)41 418 230
E-mail: zkurt@mapbf.pbfrng.hr
Phone: 385 (0)41 440 463
Summary: The project is aimed at investigation of measurement,
mathematical modelling and computer control of nonstationary states in
process engineering ( chemical, biochemical and food engineering ). In the
field of chemical engineering is studied dynamical behavior of CO
oxidation on Pt catalyst which exhibits appearance of limit cycles, surface
waves and chaotic states. Nonsteady dynamics of biochemical reactors is
studied by application of models derived from microorganism metabolism and
by use of input/output models with artificial neural networks. For study of
adaptive control of bioreactors is investigated use of Kalman algorithm
for estimation of unmeasured biological variables. A part of the project is
devoted to study of nonstationary transition occurring during freezing and
thawing of myobilar proteins from pilchards ( surimi ). Investigated are
thermophysical parameters, nonsteady heat transfer, enthalpy and efficacy
of various cryoprotectors. In food process engineering is studied dynamics
of solid/solid mixing process in mechanical mixers. This study is aimed to
application in chemical, food and pharmaceutical industry.
Keywords: mathematical modelling, optimal control, state and parameter estimation, artificial neural network, limit cycle, CO oxidation, platinum Pt, cultivation of baker's yeast, heat transfer, thermophysical parameters, enthalpy, differential thermal analysis DTA, freezing, proteins ( surimi ), solid/solid mixing
Research goals: Aim of this project is to develop measurement
methods, mathematical and computer models and apply theory of control of
dynamic system in process engineering ( chemical, biochemical and food
engineering ). The investigations have emphasis on study of dynamic
properties of nonlinear systems. The study of nonstationary features in
chemical catalytic reaction systems will give better understanding of
catalytic mechanism and provide basis for control of such processes with
improved selectivity and productivity unattainable with classical steady
state control. Analysis of unsteady phenomena of bioreactors has an
outstanding importance in biotechnology. Mathematical modelling of
intracellular states in relation to processes of energy and momentum
transfer in abiotic phase is expected to contribute to theoretical
development of bioreactor control. Artificial neural networks are studied
in the context of bioreactor identification and control. Investigated are
different network structures and adaptation algorithms. The results are
aimed to application in industrial production of baker's yeast. A part of
the study is devoted to nonsteady responses of myofibilar proteins from
pilchards (surimi) during freezing. The goal is to quantify cryoprotector
activity of different additives used in the production. A part of the
project deals with study of dynamics of solid/solid mixing enabling
elucidation of complex interaction between momentum transfer and physical
and chemical properties of solids. The results will lead to improvement of
quality of various products in food and pharmaceutical industry.
COOPERATION - INSTITUTIONS
Name of institution
: Chemical Engineering Department, The
University of Houston Type of institution: Economical/Production City: 77204-4792 - Houston, TEXAS, USA
Name of institution
: Department of Bioresorce Engineering,
Oregon State University Type of institution: Economical/Production City: 97331-3906 - Corvallis, OREGON, USA
Name of institution
: Department of Biology and Biomedical
Sciences, The University of Ulster at Coleraine Type of institution: Economical/Production City: BT52 1SA - Coleraine, England/ N. Ireland
Name of institution
: Food Refrigeration and Process Engineering
Research Centre, University of Bristol Type of institution: University/Faculty City: BS18 7DY - Langford/Bristol, England
Name of institution
: Pliva/ Institut / Tvornica kvasca Type of institution: State institute City: 10000 - Zagreb, Croatia
Name of institution
: PODRAVKA / Tvornica kvasca Type of institution: State institute City: 48300 - Koprivnica, Croatia
OTHER ACHIEVEMENTS
Name
: Konstrukcija mjernog uređaja za diferencijalnu termičku
analizu s on-line međusklopom za PC računalo i softwareom za određivanje
entalpije Type of achievement: Instrumentation Authors: Želimir Kurtanjek
Name
: Mjerni uređaj s međusklopom za PC računalo i software za
impulsnu metodu s linijskim izvorom za određivanje koeficijenta toplinske
vodljivosti prehrambenih proizvoda Type of achievement: Instrumentation Authors: Želimir Kurtanjel Other information about the project.