Vol.2, No 8, 1998 pp. 825 - 828
A REPORT ON THE VI INTERNATIONAL CONFERENCE
ON SYSTEMS,
AUTOMATIC CONTROL AND MEASUREMENTS SAUM' 98
VI International Conference on Systems, Automatic Control and Measurements
SAUM '98, organized by SAUM (Association of Serbia for Systems, Automatic
Control and Measurements), was held in Niš, Serbia, Yugoslavia. The conference
was opened on September the 28th and lasted for three days, until September
the 30th 1998. Co-organizers of the conference were Faculty of Mechanical
Engineering and Faculty of Electronic Engineering, University of Niš and
Faculty of Mechanical Engineering, University of Belgrade and the whole
project was supported by Ministry of Science and Technology of Serbia and
Federal Ministry for Development, Science and Environment of Yugoslavia.
The conference was carefully planed and prepared well in advance so
the first announcement and call for papers was issued in January 1998.
and was available at the Conference Internet Site as well. Good organization
of the conference was accomplished owing to successful coordination of
the conference chairman, Assoc. Prof. Dr Zoran Bučevac, meritorious SAUM
member, and his cooperation with Organizing Committee. Honorary Committee
and International Program Committee, consisting of distinctive professors
in their fields, gave the special significance to the conference.
This year, for the first time since SAUM was founded, one SAUM conference
was organized at the international level. The idea about the international
character of SAUM meetings originated from the very beginning of SAUM activities
and was finally realized with the VI International SAUM Conference in Niš.
The previous five SAUM conferences were organized every third year since
1983. and the participants were mostly from Yugoslavia. SAUM attempts to
maintain the dynamics of its conferences and the plan is to continue organizing
meetings in the future with the wish to bring them to a higher level each
time.
The significant step forward in SAUM activities development was accomplished
by organizing the VI International SAUM Conference. Submitted papers were
internationally reviewed and approximately 100 papers were accepted by
the Program Committee to be included in the conference program. About 70%
of all papers were written by Yugoslav authors (which is approximately
120 authors) and the rest were written by approximately 50 foreign authors
from Australia, France, Germany, Japan, Moldavia, Romania, Russia, South
Africa, Ukraine, and USA. All the papers accepted for the conference program
were printed in English in the Conference Proceedings.
Besides regular papers, which were divided into seventeen sessions,
the Proceedings includes six plenary session papers, written by eminent
invited authors from abroad. These papers covered a wide range of fields
in automatic control such as: conventional control methods using PI and
PID controllers tuned by a generalized form of the symmetrical optimum
method, Lyapunov functions and their applications, the Hamiltonian approach
to optimal control and filtering problems, variable structure systems and
intelligent autonomous systems as a challenge to control engineers. The
last mentioned field is the one of special interest of the professors Ljubiša
Vlačić from Australia and Makoto Kajitani from Japan who presented a lecture
on intelligent autonomous systems at the plenary session Intelligent Autonomous
Systems - A Challenge to Control Engineers. The invited paper Methodology
for Direct Construction of Lyapunov Functions and Applications, written
by Vladimir Bajić from the Republic of South Africa, was another contribution
to the conference. Zoran Gajić (USA) and Myo-Taeg Lim (Korea) proposed
a unified approach for optimal control and filtering of linear continuous-time
singularly perturbed systems, in the invited paper Hamiltonian Approach
to Linear Continuous-Time Singularly Perturbed Optimal Control and Filtering
Problems. A survey on variable structure systems was given by Branislava
Peruničić, Čedomir Milosavljević, Goran Golo and Darko Mitić at the plenary
session. Another invited paper was written by Stefan Preitl and Radu-Emil
Precup from Romania. Their contribution is Tuning of PI and PID Controllers
by a Generalized Form of the Symmetrical Optimum Method. Vinogradov, Budkin
and Temliakov from Russia gave a survey on Modern Status of Dynamically
Tuned Gyros and Perspectives of their Use.
Regular papers were divided into sessions which covered following topics
on theory, engineering, production, application, usage and selling of hydraulic,
pneumatic, electronic, computer technology based on combined control components,
semi-automatic or automatic control systems:
- A/D conversion and data acquisition
- sensors and measurements
- analysis and design of electrical machines' control systems
- controller and control system design
- modeling of components and systems
- system analysis
- automation and logic control
- machinery, industrial processes and missile control
- fuzzy logic and control
- invention protection, education, safety and some realizations
- in the area of automatic control
- modeling and system parameters identification
- variable structure control systems and neural networks
- vehicle dynamics and control.
The papers from the session A/D conversion and data acquisition proposed
some new solutions concerning analogue to digital conversion in industrial
environment, universal A/D conversion of non-electrical quantities, well
logging acquisition systems, using program package for data acquisition
and using a PC parallel port for control and data acquisition.
Sensors and measurements were discussed in two sessions. Those discussions
included:
- semi-conductor gas sensors,
- sensor matrix for tactile sensing,
- instrument transformers in contemporary electronic instruments,
- mechanical-to-electric transducers,
- flow measurements in partially filled pipes,
- wide rang high accuracy measurement of the motor rotational speed,
- choice of digital sensors for auxiliary motion at numerical drilling-grinding
machines,
- system for measurement,
- control and safety realization of rocket motor testing and
- measuring erosive burning rate of solid rocket propellants.
Analysis and design of electrical machines' control systems were considered
in papers on:
- compensation strategy for suppressing speed oscillations of induction
motor,
- current regulation method in vector controlled permanent magnet synchronous
machine,
- high performance control of a permanent magnet stepping motor,
- velocity estimation in digital controlled DC servo drives,
- positionally digitally controlled DC motor in mechanical ratcheting
and
- design of digitally-speed-controlled servo drive with extended observer.
Design of controllers and control systems was surveyed over two sessions.
They included different approaches to control design like: design of H?
controllers, control system design using orthogonal polynomials, optimal
control design and LQG optimal control, sequential design of decentralized
controllers, digital control design using observers, feed-forward compensators
and others.
Modeling of components and systems was discussed in papers considering
hydraulic and electro-hydraulic control systems, as well as modeling, simulation,
identification and control for different systems from implementation point
of view.
Papers on system analysis considered: three phase system quality estimation
under non-sinusoidal conditions, symbolic computation of impulse, step
and sine responses of linear time-invariant systems, sensitivity of the
process control system, fault detection in non-linear chemical process.
Contributions in the fields of automation and logic control and manipulator
and robot control proposed: improvements on the control logic and protection
for thermal power plant installations, automation of analyzing capacity
and profitability of cable making plants, and other new approaches to logic
control through case studies, as well as different results in manipulator
and robot control.
Electro-hydraulic and electro-pneumatic servo systems as well as hydraulic
velocity servo system were main subjects of discussions concerning implementation
of automatic tracking control.
Machinery, industrial processes and missile control were studied in
papers referred to airplane part production, control systems in virtual
manufacturing, development of software system for control of fuel economy
and diagnosis of operating conditions of one steam turbine unit, target
tracking and giro power drive.
Fuzzy logic and control was covered in papers based on theoretic work
and applications on fuzzy systems in general, and some special fields of
fuzzy logic implementation were discussed, too.
One of the contributions in the fields of invention protection, education,
safety and some realizations in the area of automatic control, was the
proposal of a concept of Faculty of control engineering, given by professor
Lyubomir Gruyitch from France. In his contribution Faculty of Control Engineering
he pointed that: "Automatic control science and engineering has become
both a self-contained scientific and engineering domain. It is characterized
by its own, original and important tasks, problems, methods, methodologies,
techniques and technologies. It is among the engineering areas with the
greatest combinatorics of possible design solutions and implementations.
Its applications have become among the widest applications. Automatic control
has been dominating for its superiority over manual or semi-automatic control
for large classes of. Control engineer duties demand highly responsible
and fully competent professionals. They are to be educated as complete
automatic control engineers at the undergraduate level. Such an adequate
education should be provided by Faculty of control engineering, a concept
of which is proposed."
Modeling and system parameters identification were covered in papers
on:
- obtaining state space model from bond graph model with derivative
causality using Laplace transform,
- identification of steam super-heater parameters using on-line measurements
in thermal power plant "Kostolac B",
- determination of non-measurable servo system parameters using maximum
likelihood method,
- overtraining in multilayer neural networks,
- postprocessing of the system states with self organized neural networks
and
- identification of the elastic-mass characteristics of the aircraft
using the vibration testing data.
Variable structure control systems and neural networks were discussed
as parts of one session, which included papers on variable structure systems
and their static accuracy, adaptive variable structure systems, digital
variable structure controllers as well as papers on application of neural
networks.
The papers considering vehicle dynamics and control proposed some solutions
concerning oscillations, vehicle design, vehicle suspension system and
automatic regulation of a driving bulldozer motor and its working equipment
control. Most of the papers were based on the researches of Zastava-Institute
for Automobiles employees.
The authors of the papers in mentioned sessions are from wide range
of professional areas. Most of them are from university centers, but also
from scientific research institutes and industry. Presenting their papers
they attempted to show fragments of their researches, results and discoveries
and to share their experiences and knowledge in the fields of interest.
Gathering of professionals, experts, engineers, researchers and scientists
from all areas of automatic control, system theory and engineering, measurements
and informatics dealing with automatic control and from other related fields,
at SAUM Conference, enabled exchange of experiences, views and results
of research in these areas. It also opened entrance to development of new
ideas based on surveying present state of automatic control implementation
in industry, education, systems and control science and engineering. From
that point of view VI International SAUM Conference confirmed itself as
an outstanding conference with perspective to gather even more researchers
and present their results in the future.
The report was prepared by Tamara
Nestorović, postgraduate student at the Faculty of Mechanical Engineering,
University of Niš. For more detailed information about the Conference and
the papers, readers should refer to the SAUM '98 Conference Proceedings,
or contact the conference chairman Assoc. Prof. Dr Zoran Bučevac, e-mail:
zbucevac@EUnet.yu.
