CONCEPT OF AUTOMATIC CONTROL SYSTEM FOR IMPROVING THE EFFICIENCY OF THE ABSORPTION REFRIGERATING UNITS

The general concept of the automatic control systems constructing for increasing the efficiency of the artificial cold production process in the absorption refrigerating units is substantiated. The described automatic control systems provides necessary degree of the ammonia vapor purification from the water in all absorption refrigerating units modes and minimizes heat loss from the dephlegmator surface.

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MODELING OF A SYSTEM FOR AUTOMATIC REGULATION OF THE TENSION MODE IN THE ROUGHING GROUP OF STANDS OF A CONTINUOUS SECTION MIL

Bulletin of National Technical University KhPI Series System Analysis Control and Information Technologies ◽

10.20998/2079-0023.2021.01.11 ◽

2021 ◽

pp. 67-73

Author(s):

Ivan Marynych ◽

Olga Serdiuk

Keyword(s):

Control System ◽

Automatic Control ◽

Control Systems ◽

Automatic Control System ◽

Rolling Mill ◽

Rolling Speed ◽

Automatic Regulation ◽

Automatic Control Systems ◽

Rolling Mode ◽

Uneven Heating

The subject of the research is automatic control system modeling features for tensioning of stands roughing group, which takes into account changes in the rolling speed at exit of the previous stand and entrance to the next stand. Control systems for high-speed rolling on section mills are the most critical systems, since the trouble-free operation of rolling mill largely depends on their work. Rolling speed control is understood to mean tension regulation in the roughing group of stands and stabilization of the rolling loop in the finishing groups. The influence of such technological factors as uneven heating of blanks, change in the crimping mode in stands, etc. leads to the appearance of tension or back-up forces, deviation of rolled loop from the specified values. Tension rolling, in contrast to loop rolling, is a stable rolling mode. However, (at significant values of tension in the rolled products) such a rolling mode leads to different thicknesses of the finished product. The loop rolling mode is an unstable mode and is impossible without automatic control systems. Both in the tension rolling mode and in the free rolling mode with a loop, it is necessary to study automatic control systems in order to determine the possibilities of compensating for disturbing influences and obtaining rolled products of the given accuracy. Therefore, the main task of the automatic control system is to maintain the rolling mode with the lowest possible tension. To achieve this goal, direct control of the tension of the rolled strip with modern technical means is rather difficult, and the operation of tension control systems is based on indirect methods of measuring it, and the study of the system efficiency is reduced to modeling the process itself. The developed model consists of three stands and two inter-stand spaces, since it takes into account changes in rolling speed at the exit of previous stand and the entrance to the next stand. It is due to this that adequate simulation results are obtained that are close to the real rolling process. Keywords: automation, rolls, stand, inter-stand spacing, modeling, loop tension, rolling mill, roughing group.

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Choosing parameters of vessel’s course automatic control system under the influence of water-wave disturbances

Automation of ship technical facilities ◽

10.31653/1819-3293-2020-1-26-27-40 ◽

2020 ◽

Vol 26 (1) ◽

pp. 27-40

Author(s):

Максим Валерійович Левінський ◽

◽

Валерій Михайлович Левінський ◽

◽

...

Keyword(s):

Control System ◽

Automatic Control ◽

Control Systems ◽

Fuel Consumption ◽

Automatic Control System ◽

Water Wave ◽

Manual Operation ◽

Automatic Control Systems ◽

Wave Disturbances ◽

Influence Of Water

opicality. Modern vessel’s course automatic control systems allow to reduce ship’s running time and fuel consumption during voyage compared to manual operation. Effectiveness of their implementation depends on the timely adjustment of the controller parameters following the changes in the vessel’s dynamics, which requires usage of adequate models and qualification of the maintenance stuff.

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Optimization of nonlinear pulse systems of automatic control with astatic objects

Energy and automation ◽

10.31548/energiya2021.01.061 ◽

2020 ◽

pp. 61-70

Author(s):

O. Sinyavsky ◽

◽

V. Kisten ◽

N. Solomko ◽

◽

...

Keyword(s):

Control System ◽

Automatic Control ◽

Control Systems ◽

Pulse Duration ◽

Automatic Control System ◽

Linear Element ◽

Optimal Parameters ◽

First Order ◽

Automatic Control Systems ◽

In Series

Currently, nonlinear pulse automatic control systems have become widespread, so there is a need to develop methods for their study. Pulse regulators are created on the basis of positional with the addition of pulse breakers. They can be represented as a non-linear element, a simple impulse element and a forming circle connected in series. The aim of the study was to determine the optimal parameters for setting up a relay-pulse controller for an astatic object with a delay. When determining the parameters of adjustment of the relay-pulse regulator for the quality indicator in the optimization of the automatic control system was taken as the total square deviation. Applying this criterion, the pulse duration of the regulator was determined. The time quantization interval is determined from the condition of ensuring the absolute stability of the automatic control system. Analytical dependences were obtained to determine the pulse duration and time quantization interval, which make it possible to determine the debugging parameters of the relay-pulse controller for a first-order astatic object with a delay. This ensures a minimum control error, and the control system is stable.

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СПЕКТРАЛЬНЫЕ ПЛОТНОСТИ РЕГУЛИРУЕМЫХ ПЕРЕМЕННЫХ ТИПОВЫХ САР И ИХ АППРОКСИМАЦИЯ МАЛОПАРАМЕТРОВЫМИ МОДЕЛЯМИ

Automation technological and business processes ◽

10.15673/atbp.v10i4.820 ◽

2018 ◽

Vol 9 (4) ◽

Author(s):

В. А. Хобин ◽

С. И. Лагерная

Keyword(s):

Control System ◽

Spectral Density ◽

Automatic Control ◽

Control Systems ◽

Real Time ◽

Automatic Control System ◽

Control Object ◽

Mathematical Expression ◽

Computer Experiments ◽

Automatic Control Systems

Two groups of the mathematical models, which describe changes in the regulated variables of closed automatic control systems as stochastic processes, are considered in the article. The first group is the informative models, obtained on the basis of analytical transformations that represent in the model of the process spectral density all the parameters of the object, regulator and perturbation effects models. The second group is well reflecting the nature of the spectral density formal models with a minimum number of parameters. This makes it possible to identify them in the real time, during the regular operation of the automatic control system. Comparison of models, including computer experiments based on simulation show the potential promise of their application for identifying the parameters of control object models in real time and without opening the control loop of automatic control systems. In the article the mathematical description of the automatic control system is considered taking into account the features of the technological type control objects, such as the presence of delay in the control channels, susceptibility to uncontrolled disturbances (intensive coordinate disturbances and parametric, low-frequency disturbances). A detailed considered the procedure for obtaining a mathematical expression for the informative models of the controlled variable spectral density for test typical variants of various system properties and perturbations combinations. The illustrations of the controlled variable of automatic control systems spectral density features are presented for various types of systems. There are also presented the possibility of replacing the informative controlled variable spectral density models with formal ones.

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The Research on Multi-Axes Automatic Motion Control Systems

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.459.75 ◽

2012 ◽

Vol 459 ◽

pp. 75-78

Author(s):

Lian Jun Hu ◽

Xiao Hui Zeng ◽

Gui Xu Chen ◽

Hong Song

Keyword(s):

Control System ◽

Embedded Systems ◽

Automatic Control ◽

Control Systems ◽

Motion Control ◽

Automatic Control System ◽

Experimental Results

An automatic control system for multi-axes motions based on multi-CPU embedded systems is proposed in the paper, in order to overcome insufficiencies of available multi-axes automatic dispensing control systems. It is shown from experimental results that expected control objectives for multi-axes motions are achieved.

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METHOD ENSURING ACCESS TO INFORMATION TECHNOLOGICAL RESOURCES OF AUTOMATIC CONTROL SYSTEM BY WATER SUPPLY COMPANY

Bulletin of Bryansk state technical university ◽

10.12737/20286 ◽

2016 ◽

Vol 2016 (2) ◽

pp. 167-174

Author(s):

Михаил Рытов ◽

Mikhail Rytov ◽

Сергей Шпичак ◽

Sergey Shpichak

Keyword(s):

Control System ◽

Water Supply ◽

Automatic Control ◽

Control Systems ◽

Communication Channels ◽

Access To Information ◽

Access Policy ◽

Automatic Control Systems ◽

Water Supply Company ◽

Blom's Scheme

The problems of access control to information and technological resources of automatic control systems for water supply companies are considered. The formalized model of the process of reliable access to information and technological resources is shown. The model takes into account the existence of a multitude of communication channels and a possibility of the organization of the operative cross access. A method to ensure a reliable access to information and technical resources of automatic control systems by water supply companies on the basis of the access policy combination, a scheme of deposit and a preliminary distribution of access authenticators. As a base example there was adopted Blom’s scheme. The method allows ensuring an operative cross access in case of emergency. To ensure an operative access in the method mentioned there was used a scheme of a complete division of a secret in the combination with authenticator evolution. As a basic example the evolution of authenticators based on Lamport’s protocol is considered.

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Automatic Regulating System Model of Thermal Power Plant Based on Single Loop Feedback Control

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.543-547.580 ◽

2014 ◽

Vol 543-547 ◽

pp. 580-584

Author(s):

Gui Qiu Su ◽

Chao Zhang

Keyword(s):

Control System ◽

Power Plant ◽

Automatic Control ◽

Production Process ◽

Automatic Control System ◽

Thermal Power Plant ◽

Thermal Power ◽

System Model ◽

Single Loop ◽

Loop Feedback

The production process of the thermal power plant is transferring primary energy to secondary energy. Loss of energy is quite large for coal machine. When using air supply machine and other boiler auxiliary equipments, saving energy, reducing energy consumption is an important way to reduce the cost. This paper first analyzes the basic principle of energy transformations generation field and principle characteristics of thermal automatic control system during the production process. On the basis of energy saving and low cost framework, according to the single loop feedback construction, we establish automatic control system model of thermal power plant. Through comprehensive cloud generator we do simulation on thermal power enterprises, the result is significant. It shows that this model can provide scientific theoretical basis for the operation mode of power generation enterprises in a certain degree.

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Synthesis of Boiler Controllers of the Automatic Power Control System of Power Units

ENERGETIKA Proceedings of CIS higher education institutions and power engineering associations ◽

10.21122/1029-7448-2020-63-3-223-235 ◽

2020 ◽

Vol 63 (3) ◽

pp. 223-235

Author(s):

G. T. Kulakov ◽

K. I. Artsiomenka

Keyword(s):

Control System ◽

Power Control ◽

Automatic Control ◽

Control Systems ◽

Fuel Consumption ◽

Power Unit ◽

Power Controller ◽

Automatic Control Systems ◽

Automatic Power Control

The article concerns the problem of structure-and-parametric optimization of a cascade automatic control system (CACS) by an example of a boiler power controller and a fuel controller. This CACS, which is a part of automatic control systems for power units, consists of two loops, viz. of an inner loop (which purpose is stabilization of the system) and an outer loop (designed for the adjustment) and, also, of two controller, viz. an outer controller (which is a basic one) provided for stabilization of the output value of the object (in our case, of the actual power unit capacity) and of an inner controller (which is an auxiliary one) provided to regulate fuel consumption. The internal controller builds up the control action with the aid of the boiler load controller of the power unit. As compared to single-loop automatic control systems, the cascade system provides better quality of transient control due to the higher performance of the internal loop of the system. This advantage is especially noticeable when compensating for disturbances that come through the channel of regulating impact. The article presents two methods of setting, viz. the fuel controller and the boiler power controller. The application of these methods can improve the quality of power control and reduce fuel consumption in transient modes in comparison with the setting of these controllers of a typical power unit automatic power control system. The results of computer simulation of transient processes in CACS for input step surge and internal perturbation confirm the advantages of the methods are presented in this article.

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THE WAYS TO IMPROVE THE SUBSIDIARY ELECTRIC DRIVE OF HIGH-SPEED ELECTRIC STOCK

Bulletin of scientific research results ◽

10.20295/2223-9987-2018-1-121-131 ◽

2018 ◽

pp. 121-131

Author(s):

Elena Makarova ◽

Stanislav Telichenko ◽

Ildar Shakirov ◽

Alexander Trifanov ◽

Alexander Ivanov ◽

...

Keyword(s):

Fuzzy Logic ◽

Control System ◽

Automatic Control ◽

Automatic Control System ◽

Computer Model ◽

Electric Drive ◽

High Speed ◽

Practical Importance ◽

Automatic Control Systems ◽

Research Findings

Objective: To improve the subsidiary electric drive of high-speed electric stock by applying asynchronous drive frequency regulator. Methods: Fuzzy logic concepts were applied for an automatic control system regulator. Results: A computer model of the regulator was developed and the results of modeling were presented in the form of optimization process of load moment stepped variation by the control system with standard and fuzzy logic controllers. Practical importance: On the basis of the introduced computer model, transient analysis is possible in automatic control system of the subsidiary electric drive of the high-speed electric stock. The research findings may be used in the design of new and retrofit of the existing automatic control systems of the subsidiary electric drive with improved characteristics of control performance.

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