#7 2010

Discussing a Subject…
Simulation for industrial automation
Introduction

Raskin E.M., Denisova L.A., Sinitsin V.P., Nesterov Yu.V.  A mathematical model for feedwater system of a steam generator at a power unit of an A-plant

The paper presents a mathematical model for feedwater system of a steam generator at a power unit of an A-plant with variable transfer function coefficients. The model is implemented in MATLAB/Simulink/Stateflow event-driven simulation environment.
Keywords: steam generator`s feedwater system model, event-driven simulation, transfer functions with variable coefficients, regulatory control system.

Vlasov S.A., Devyatkov V.V., Usanov D.I.  Application of simulation models for productive capacity evaluating in metallurgical production control

With a case study from metallurgical industry, the paper shows the expediency of applying simulation technique for ensuring the required production performance. Simulation models used for this purpose describe temporal and economic relationships in a process system subject to probability distribution of work execution time.
Keywords: simulation technique, production facilities, metallurgy, queuing systems, performance indices.

Surnichenko A.A.  Improving the reliability of SMK-350 brick-making complex through process controls modernization

The paper offers an approach to improving the reliability of brick-making process through controls improvement. The proposed system is based on SIMATIC PCS7 platform which automates performance and quality data acquisition and analysis and includes a set of new mathematical models comprising reliability dynamics prediction, optimal service, backup components quantity, and the evaluation of maintenance and revamping cost effectiveness.
Keywords: process control system, reliability, brick-making complex, failure rate, reliability model, optimal service, cost effectiveness, long-term observation.

Gryzhov V.K., Korol`kov V.G.  Signal converter model for hybrid control system design in VisSim environment

A novel method for converting discrete impulse signals into continuous in VisSim environment is offered. A step-by-step description of the method is presented. Operation principle, algorithm, and converter diagram are included. The opportunity of converter application in control systems is shown.
Keywords: automatic control systems, digital controller, interpolator, delta-function, quantization step, discrete impulse signal.

Yachikov I.M., Logunova O.S.  Controlling volumetric electromagnetic forces in the bath of a DC arc furnace

A new control strategy for the currents passing through the 2 bottom electrodes of a DC arc furnace is offered. The new strategy enables better electric vortex flows rejection at the furnace bottom at constant arc power. The paper shows the opportunity of controlling the melt intensity and flow direction in the bath of a DC arc furnace by adjusting phase displacement between the pulsating currents.
Keywords: plasma furnaces, volumetric electromagnetic forces, poling intensity, currents control strategy, electric vortex melt flows.

Manuilova E.V., Fedorov V.I., Lisitsyn N.V.  Optimization of total xylenes recovery

The paper discusses total xylenes recovery process and proposes the ways to improve its efficiency. A soft sensor was developed for predicting the product quality and advising on the optimal values of process control variables. The results were tested at an operating plant where the validity of the inferential model developed was proved.
Keywords: total xylenes, soft sensor, optimal process control.

Vedernikov V.A., Lysova O.A., Lopatin R.R.  Investigating the influence of the control action duration on the submersible electrical motor`s torque at pump wedging

The paper investigates the influence of the duration of control impact change time at the input of the frequency converter control system on submersible electrical motor`s torque during the wedging of impellers of a centrifugal pump. A preventive pump wedging algorithm is offered.
Keywords: centrifugal pump, control, submersible electrical motor, pinching.

Chistyakova T.B., Shlyago Yu.I., Novozhilova I.V.  Simulation model of an operator training system for flexible sorbent and catalyst factories

A model structure for simulating complex physicochemical processes of sorption-catalytic manufacturing is offered. The model allows to investigate these processes and to train the skills of safe and effective operation of sorbent and catalyst factories whose products are utilized in life sustenance and environmental systems.
Keywords: training simulator design, mathematical modeling and simulation, numerical techniques, software suites, flexible multi-product chemical processes, sorbents, catalysts.

Chistyakova T.B., Polosin A.N.  A simulation system for controlling extruders in flexible fabrication of polymer materials

A problem-oriented simulation system is presented. Its kernel is a library of dynamic models of standard sections of various type extruder screws used in flexible polymer material fabrication. The system allows to synthesize the models emulating hydrodynamic processes in various extruders; these models are intended for calculating residence time and the quality indices of extrudate, investigating extrusion process in various operation modes, and controlling the quality of polymers used in food and pharmaceutical industries.
Keywords: simulation, typical hydrodynamic models, residence time, numerical techniques, software suites, extrusion, polymer materials.

Piskazhova T.V.  Simulation software for process decision-making support in aluminum production

Mathematical model-based software is developed which makes it possible to calculate and display the changes of process variables under various disturbances through a special interface. The software is intended for selecting the best control decisions and strategies.
Keywords: process model, virtual electrolytic cell.

Nikolaychuk O.A., Pavlov A.I., Yurin A.Yu.  Simulation of complex engineering system dynamics based on agent approach

A simulation system for the dynamics of complex engineering systems comprising unique mechanical components is discussed. Agent model and state classes representing the stages of state change process from original flaw to failure are presented. System dynamics simulation is based on a logic-mathematical model combining expert knowledge and analytical models for implementing the behavior of agents. Simulation results underlie the decision-making support for ensuring the safety at all stages of industrial plant`s lifecycle.
Keywords: automation of safety investigation, complex engineering system, unique mechanical system, agent-based modeling. production, precedents.

Vialykh I.A., Kondrashov S.N., Shumikhin A.G.  Fuzzy control of catalytic cracker reactor section

Process control strategy at a cat cracker unit of LUKOIL-Perm Refinery is examined. A mathematical model of the reactor section is selected, and its parameters are identified. A method for creating the membership function and the rule base of process operator`s actions in various situations is offered. The results of simulation-based evaluation of the fuzzy control algorithm`s efficiency are presented which prove the expediency of applying this control strategy.
Keywords: catalytic cracking unit, process, mathematical modeling, fuzzy logic, fuzzy control.

Blagodarny N.S., Krivov M.V., Kolmogorov A.G., Kobozev V.Yu.  Fidelity criterion for simulation model

An approach to the problem of process model validation is offered. The solution is based on the correctness of how the training simulation model represents real-life process situations described by experts. A model validation criterion is offered and the validation procedure is described. An example is included.
Keywords: operator training simulator, simulation model, validity, fuzzy logic, situational model.

Abrosimov M.B., Ghil`man E.A., Krivonosov A.A., Yerkhov A.V.  On the development and implementation of an operator training simulator for isobutene dehydrogenation unit

In 2010, INIUS JSC has commissioned an operator training simulator for IF-2-3-4 isobutane dehydration and isobutene/isobutylene recovery unit of Sibur-Uralorgsintez JSC (Chaikovsky, Russia). The paper describes the structure and featured properties of the training system.
Keywords: operator training system, DCS, hazardous plant, simulation, virtual space of a process unit.