scholarly journals DEVELOPMENT OF AN AUTOMATIC CONTROL SYSTEM FOR THE FLOTATION PROCESS OF POTASSIUM CHLORIDE

2021 ◽  
Vol 21 (1) ◽  
pp. 147-158
Author(s):  
M.N. Fel’ker ◽  
◽  
K.D. Bakhtereva ◽  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Software Package ◽  
Optimization Method ◽  
Transient Time ◽  
Flotation Process ◽  
Matlab Simulink ◽  
Automatic Control Systems ◽  
Density Control

The article discusses the creation of an algorithm and the synthesis of a two-loop automatic control system for level and density, instead of the current single-loop one. Aim. Density stabilization and stabilization of the flotation machine power supply by creating a two-circuit automatic level and density control system in order to improve the quality of the final product. Materials and methods. Since there is no net lag in the system, the controller is tuned using the parametric optimization method, namely: according to the criteria of modular (MO) or symmetric optimum (CO). The MO/CO criterion is also used to adjust the contour. All automatic control systems are obtained in the MATLAB Simulink software package. Control quality is measured by metrics such as transient time, overshoot, and system error. The first two indicators show the dynamics of the process, and the last indicator shows the accuracy of the system. Conclusion. The finished two-loop automatic control system, developed in the software package MATLAB Simulink, according to the analysis of the obtained process parameters, provides stabilization of the density and level in the agitation tank for flotation.

EXPERIMENTAL STUDIES ON THE DEVELOPMENT OF AN AUTOMATED SYSTEM FOR REGULATING THE SOIL DENSITY USED IN A SEEDING MACHINE

2021 ◽  
pp. 9-15
Author(s):  
ALEKSEI S. DOROKHOV ◽  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Power Supply ◽  
Experimental Studies ◽  
Automated System ◽  
Statistical Characteristics ◽  
Vegetable Crops ◽  
Soil Density ◽  
Density Control

Research on the development of an automatic control system for the rolling-in working units is aimed at establishing the reliability and analytical relationships, determining the quality indicators of work in real conditions of the rolling-in working units of a seeding machine, and checking the patterns obtained in the fi eld and identifi ed theoretically. Research on the development of an automatic control system for the rolling implements was carried out when sowing dragee seeds of table beet of the Bordeaux variety with a seeding unit consisting of a Belarus-4235 tractor and a Monopil S15/12 precision seeding machine. The system for automatic control of soil density includes the main hardware and software: actuators for maintaining and deepening the rolling working units, microcontrollers, motor drivers, a non-contact ultrasonic sensor, a power supply unit and a sensor for measuring soil density. The paper presents the results of a study to determine the soil density when sowing seeds of table beet, depending on the moisture content of the soil in the sowing layer. The authors describe research methodology, provide graphical relationships between changes in soil density and the depth of seeding, and comment on the main obtained statistical characteristics of the experiment. As a result of the study, structural, echnological and functional diagrams of a rolling rink with an automatic control system using electronically controlled electric cylinders (linear actuators) have been developed. The optimal parameters of the linear drive of the press roller have been established: power - 50W, power supply - 12V, rod stroke - 200…600 mm, speed - 10…45 mm/s, load - 200…900 N. Experimental studies have shown the applicability of the presented system of the automatic control of soil density, which ensures the optimum density of the seedbed of 1.3…1.4 g/cm³. The described technique can be used to develop a soil density control system when sowing seeds of other vegetable crops.

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

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.

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

2017 ◽  
Vol 8 (4) ◽  
Author(s):  
O. Titlova ◽  
V. Khobin ◽  
O. Titlov
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Production Process ◽  
Control Systems ◽  
Heat Loss ◽  
Automatic Control System ◽  
General Concept ◽  
Ammonia Vapor ◽  
Automatic Control Systems

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.

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

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.

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

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.

scholarly journals AN ANALYSIS OF PIDD2 CONTROLLERS OPTIMAL ADJUSTING ALGORITHM IN MPP FUEL PREPARATION SYSTEM

2017 ◽  
Vol 5 ◽  
pp. 3-12
Author(s):  
Andrii Simanenkov
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Combustion Engine ◽  
Stability Margin ◽  
Optimal Point ◽  
Automatic Control Systems ◽  
Simulated System ◽  
The Mathematical Model ◽  
Controlled Object

The possibility of introducing PIDD2 controllers into adaptive automatic control systems using the proposed algorithm for finding the optimum adjusting parameters of the specified controller is considered. The carried out analysis of the structural implementation of the PIDD2 controller and the estimation of the filter time constants of the first and second order differentiation units made it possible to formulate the structure of the PIDD2 controller-based adaptive automatic control system. The proposed algorithm for finding the optimum adjusting parameters of the PIDD2 controller consists in a purposeful procedure for finding the optimal point with the maximum value of the transfer factor of the controller in the parameter space, taking into account the preset stability margin. In determining the steps of the algorithm, the structural and parametric optimization of the filters of the differentiation links is performed, which make it possible to reduce the problem only to the search for adjusting parameters of the controller. The work of the proposed algorithm is illustrated by the example of an automatic control system, where the mathematical model of the heat exchanger unit of the fuel combustion engine of the internal combustion engine is the controlled object. Analysis of transient processes and frequency responce of the simulated system shows the qualitative superiority of the adaptive automatic control system with the optimally tuned PIDD2 controller over the conventional automatic system with a PID controller. The versatility of the algorithm and the ability to periodically adjust the adjustments of the controller are also noted.

scholarly journals Optimization of nonlinear pulse systems of automatic control with astatic objects

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.

scholarly journals Application of the ARMA Model to Describe and Forecast the Flotation Feed Solids Flow Rate

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8587
Author(s):  
Jarosław Joostberens ◽  
Aurelia Rybak ◽  
Joachim Pielot ◽  
Artur Dylong
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Flow Rate ◽  
Arma Model ◽  
Volumetric Flow Rate ◽  
Model Parameters ◽  
Quantitative Parameter ◽  
Flotation Process ◽  
Coal Flotation

The flow rate of solids is subject to random disturbances of the changing feed and can significantly affect the quantitative and qualitative parameters of the coal flotation products. This quantity can be described as a stochastic process. The paper presents the results of the solids flow rate model for coal flotation identification calculations, treated as a disturbance to the process. This is an innovative approach to modelling those quantitative parameters of the flotation feed that are measurably available and whose random changes have a significant impact on the enhancement process under industrial conditions. These include the volumetric flow rate of the feed and, in particular, concentration of solids in the feed. Therefore, it is suggested that random changes of these two parameters of the feed should be mapped using a model of one quantity—the flow rate of solids. This solution is advantageous because this quantity, as a quantitative parameter of the feed, has a significant impact on the course of the coal flotation process. The model is necessary in the process of designing an automatic control system through simulation tests. It allows us to generate a data string simulating random changes to this quantitative parameter of the feed. On this basis, in the simulation model, the correct functioning of the automatic control system is tested, the task of which is to compensate the influence of this disturbance. To determine the empirical model of the feed solids flow rate, measurement data obtained during the registration of the solids concentration and volumetric flow rate of the feed were used in four consecutive periods of operation of an industrial facility of one of the Polish coal processing plants. The time courses of the solids flow rate in the feed were described by ARMA (autoregressive–moving-average model) means, and the two-stage least squares method was used to estimate the model parameters. The results of the identification and verification of the designated model showed the correctness of adopting the third-order ARMA model, with parameters a1 = −1.0682, a2 = −0.2931, a3 = 0.3807, c1 = −0.1588, c2 = −0.2301, c3 = 0.1037, and variance σ2ε = 0.0891, white noise sequence εt, determined on the basis of a series of residuals described by the fifth-order model. It has been shown that the identified model of the flow rate of solids of the feed to flotation as disturbances can be used to develop a predictive model that allows forecasting the modelled quantity with a prediction horizon equal to the sampling period. One-step forecasting based on the determined predictor equation was found to give results consistent with the recorded values of the solid part flow rate of the feed and the extreme values of the prediction error are within the range from −1.08 to 2.90 kg/s.

scholarly journals СПЕКТРАЛЬНЫЕ ПЛОТНОСТИ РЕГУЛИРУЕМЫХ ПЕРЕМЕННЫХ ТИПОВЫХ САР И ИХ АППРОКСИМАЦИЯ МАЛОПАРАМЕТРОВЫМИ МОДЕЛЯМИ

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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