Development Of Automatic Control System Research Articles

Problematics and perspectives of the development of automatic control systems for concentration tables using computer simulation

The Concentration tables are widely used for the enrichment of various materials due to a number of reasons, which include the low cost of the process and aggregates, high recovery of concentrate; environmental friendliness of the process. However, there are a number of problems associated with both the specific capacity of a single apparatus and the need to adjust the parameters of the process mode in accordance with the characteristics of the used raw materials. Currently, there are no automatic control systems for concentration tables, which is associated both with the lack of a mathematical apparatus for assessing the ore behavior during the process and with the complexity of using computer simulations for various types of materials consisting of liquid and solid systems. This article presents the prospects for the development of automatic control systems for concentration tables with regard to industry development trends.

Development of automatic control system of motion of an unmanned surface ships with a sailing installation

The object of research is an unmanned surface ship with a sailing installation. One of the problems in controlling a sailing ship using automatic systems is the almost infinite number of static and dynamic states of traditional sails, which are difficult to detect and difficult to predict. In addition, the ability of traditional sails to twist and engage is known, and all operations with sails are performed through the operation of a running and standing rigging, that is, indirectly. Given the need for continuous deployment and cleaning of conventional sails, building an automatic control system for them will obviously be an extremely difficult task.The paper considers an alternative to the traditional sail – a rigid sail-wing. For unmanned surface ships, the sail-wing is proposed to be made on the basis of symmetrical aerodynamic profiles. Such a sail-wing will simplify such a procedure as cleaning the sail, that is, ensuring its inactivity, as well as simplify the procedure for the transition of a sailing ship by moving the right or left tacks.The study presents relatively simple control algorithms that are possible when using symmetrical aerodynamic profiles for rigid sails. Such sails will make it relatively easy to implement the modes of motion of unmanned ships with tacks, as well as the mode of inactivity of the sail. Also shown is the need to build a system that combines the functions of controlling the angle of attack of the wing-sail and course control. In this case, the control system of the angle of attack does not depend on the heading control system, and the heading control system must take into account the sailing mode. Overcoming the critical transition points of the ship from one tack to another is possible using an additional propulsion device. The control of the sail-wing can be carried out using one single electric drive returns it relative to the wind at a given angle of attack, which ensures its driving force.

Control of accuracy of turning treatment of parts of machines based on fuzzy logic algorithms

The paper considers the possibility of using fuzzy logic algorithms in the development of automatic control systems for precision machining of cylindrical surfaces. For the theoretical justification of the use of these algorithms, a mathematical model of the turning process and a mathematical model of the fuzzy-controller were developed. When developing the fuzzy-controller mathematical model, its input and output linguistic variables were determined, their fuzzification was carried out. The base of fuzzy linguistic rules that formed the algorithm for controlling the processing accuracy was developed. The defuzzification method was chosen, which allows determining the value of the control value depending on the value of the mismatch of the controlled value. The value of the error of the dynamic adjustment of the processing process was considered as an input linguistic variable fuzzy-regulator was considered, and the value of the correction made to the value of the longitudinal feed - as its output linguistic variable. The results of the comparative theoretical analysis of the processing accuracy in the process system without control were studied along with the control of the classic proportional regulator and proportional fuzzy-controller using the fuzzy inference algorithm Mamdani. Based on the results of the comparative analysis, it is concluded that the use of fuzzy logic algorithms is promising in the development of automatic control systems for precision turning of machine parts.

Reckoning technique of passenger airplane approach procedure in case of all main engines failure

Cases of failure (shutdown) of all the main engines of a multi-engine powerplant in flight, unfortunately, occur both in Russia and abroad. The causes of such situations may be, for example, a flying in volcanic ash cloud, as in the case of the incident with Boeing 747 over the island of Java in 1982, or the cessation of fuel supply, as in the cases of an emergency landing of Boeing 767-233 in 1983 on an unused military airfield Gimlii and Tupolev-204 in Omsk in 2002. At the same time, in the management documentation, the crew’s actions for this case are either not prescribed at all, or spelt out so concisely that they do not imply a specific list of actions, or, in other words, they require the crew to search for the necessary aircraft control actions within the circumstances of time shortage and increased stress levels. The proposed article reveals the content of the methodology that provides for the withdrawal of an aircraft with an inoperative power plant in a safe landing environment at every airfield with an outer marker. A distinctive feature of the considered approach is the absence of the need to bind the parameters of aircraft movement to explicitly stated landmarks. In addition, this approach is simple to implement and at the present stage of development of automatic control systems may well be implemented on board an aircraft in an automatic or director mode. The minimum information required for the calculation of the landing approach is limited to three parameters: the minimum drag airspeed in the landing configuration, the height of the flight over an outer marker before the landing and the height loss on turn spiral on the prelanding manoeuvre. The content of the method in the article is illustrated by the results of the calculation of landing in case of failure of both engines of the power plant for the prospective domestic short-medium-range aircraft MS-21.

The mathematical model of the belt conveyor

Belt conveyors provide the greatest technical and economic efficiency in comparison with other types of transport. Researches show that more than 50% of failures occur due to incorrect operation of automatic control systems, leading to malfunctions of the conveyor belt in extended conveyors. Currently, this fact is a limiting factor in the development of the automobile enterprise. To improve the efficiency and for further development of automatic control systems for belt conveyors, a mathematical model of the belt conveyor has been developed.

Development of automatic control system of satellite signal parameters with TDMA technology

The control of the frequency spectrum state under operating conditions of the satellite networks that include plenty of satellite earth stations is one of the main functions of ground segment of space communication systems. In this case, the control system of the satellite network must measure the parameters of separate network segments or separate earth station if it is necessary. The necessity for selective measurements is relevant in the following cases: the power level, noise level or spurious radiation level of any earth station is significantly higher than the nominal one. The overview of some existing monitoring systems that makes automatic control of the frequency spectrum is presented. The analysis of the problem arisen during the functioning of satellite TDMA networks that involve plenty of earth stations is presented. Based on the analysis, it was concluded that the existing control systems of the satellite networks do not allow measuring high frequency parameters of separate earth stations under TDMA technology. The analysis of the problem of measuring the channels parameters of satellite network functioned by using the TDMA technology is presented. The differences between computations of channel power under “single channel per carrier” technology and the TDMA technology are presented. The authors proposed an automatic control system of high-frequency (HF) parameters of satellite signals, functioning by using the time-division multiple access technology. The block diagram of this system and description of its operation are presented. The conditions for implementing this automatic control system are defined. The time chart and its characteristics were calculated during measurements executing by this automatic control system. The method of match making between the received signals through the satellite segment and the identifiers of earth stations of the satellite network is presented.

Cannula Tip With Integrated Volume Sensor for Rotary Blood Pump Control: Early-Stage Development.

The lack of direct measurement of left ventricular unloading is a significant impediment to the development of an automatic speed control system for continuous-flow left ventricular assist devices (cf-LVADs). We have developed an inlet cannula tip for cf-LVADs with integrated electrodes for volume sensing based on conductance. Four platinum-iridium ring electrodes were installed into grooves on a cannula body constructed from polyetheretherketone (PEEK). A sinusoidal current excitation waveform (250 μA pk-pk, 50 kHz) was applied across one pair of electrodes, and the conductance-dependent voltage was sensed across the second pair of electrodes. The conductance catheter was tested in an acute ovine model (n = 3) in conjunction with the HeartMate II rotary blood pump to provide circulatory support and unload the ventricle. Echocardiography was used to measure ventricular size during pump support for verification for the conductance measurements. The conductance measurements correlated linearly with the echocardiography dimension measurements more than the full range of pump support from minimum support to suction. This cannula tip will enable the development of automatic control systems to optimize pump support based on a real-time measurement of ventricular size.

NEURO-FUZZY FORECASTING OF NON-LINEAR PROCESSES OF BLAST FURNACE PRODUCTION

Context. Neuro-fuzzy forecasting of the chemical composition of cast iron at the blast furnace output to improve the quality of blast furnace production control is considered. Objective. The aim of the work is to reduce the errors of forecasting non-linear processes of blast-furnace production. Method. It was proposed to use neural-fuzzy adaptive filter-approximators for forecasting non-linear processes of blast-furnace production (in the form of: Adaptive neuro-fuzzy inference system, fuzzy algorithm of subtractive clustering and fuzzy C-means clustering algorithm), which realize sequential and step-by-n step integration of current information. To optimize these filters for real processes, their parameters are identified by the accuracy criterion on the training and verification sequences. Results. As a result of the simulation of neural-fuzzy forecasting of the content of the chemical composition of cast iron at the blast furnace output, it was found that the best accuracy is provided by a fuzzy filter with subtractive clustering with sequential integration of the current data. At the same time, the forecast error is 4.2%, and the time for finding the optimal solutions does not introduce time restrictions on the application of this approach in blast-furnace production. The adequacy of the data was confirmed. Conclusions. Neural-fuzzy filters allow to increase the accuracy of the forecast of non-linear processes of blast furnace smelting and, due to this, to improve the quality of management of the production of cast iron. Further research should be directed to the development of automatic control systems for non-linear processes of blast-furnace production.

Development of system of automatic control of robotic arm drive

Currently, the scope of application of robotic systems and complexes is expanding significantly. The introduction of industrial robots is one of the most promising areas of complex automation of production processes, which will significantly increase labor productivity and save people from monotonous, difficult and harmful work. Many tasks are solved by facilitating robotic manipulators to facilitate human performance and to achieve higher quality and accuracy of production. Thus, thanks to the development of automatic control systems, information technologies and their application in the creation of modern robotic systems, the opportunity has emerged to release a person from work that poses a threat to his life and health. When using manipulator robots, an important task is to develop a control system that provides positioned movement of the links of the manipulator. The main task of the automatic drive control system is to form and implement a set of control effects, in accordance with technological requirements. In this work we propose a system of automatic control of the actuator of the manipulator, which provides positioned movement of the manipulator link along a given trajectory. Using the tables of originals and images of typical functions for which continuous Laplace transforms and Z-transforms are calculated, a discrete linear steady-state mathematical model of the robot-manipulator automatic control system is constructed. The parameters of the corrective devices of the system of automatic control of the electric actuator of the robot manipulator were made, which allowed to improve the characteristics of the transient process, namely: to reduce the time of over-regulation and the duration of the transient. The obtained results of the simulation of transients allow to confirm that the synthesized parameters of the corrective devices for the analog automatic control system can be used in the digital automatic control system of the electric actuator of the robot manipulator.

油气管道自动化控制系统现状及发展趋势

油气管道自动化控制系统现状及发展趋势

РАЗРАБОТКА АВТОМАТИЧЕСКОЙ СИСТЕМЫ УПРАВЛЕНИЯ ТЯГОВЫМ ПРИВОДОМ ЛОКОМОТИВА В УСЛОВИЯХ ВНЕШНИХ ВОЗМУЩАЮЩИХ ФАКТОРОВ

РАЗРАБОТКА АВТОМАТИЧЕСКОЙ СИСТЕМЫ УПРАВЛЕНИЯ ТЯГОВЫМ ПРИВОДОМ ЛОКОМОТИВА В УСЛОВИЯХ ВНЕШНИХ ВОЗМУЩАЮЩИХ ФАКТОРОВ

Mathematical simulation of the control process over water distribution in the tiers of the scrubber of blast-furnace gas wet cleaning

The pipeline of water distribution, ramified for each of the tiers of the scrubber, has been examined, as an object of control. Scrubber is intended for cleaning blast-furnace gas. The input values for this object are pressure and common amount of water that is supplied to the scrubber. The output values are pressure and amount of water before the sprayers on each tier. To clean the gas effectively it is necessary to keep the pre-set values of output parameters on each of the tiers constant. According to the technology of cleaning blast-furnace gas the water pressure before the sprayers must be for all the tiers identical and twice that blast furnace gas, and its common amount for the scrubber is determined by the correlation 4-6 l. of water for 1м3 of gas. To provide such terms it is necessary to find mathematical dependence between the input and output parameters of this object. To receive such a dependence the method of calculation of complex type pipelines is used with branching and water distribution in end points. It made it possible to get the mathematical model of an object as a system of algebraic equations. The system contains the pressure differentials of water for all the tiers of the scrubber, water constant amount for each tier and corresponding coefficients of linear losses of pressure along the length of vertical pipeline. The solution of this system gives an opportunity to find the water pressure differentials for each tier. Stabilizing these pressure differentials provides stabilizing preset water parameters (pressure and amount) on each tier of the scrubber. The obtained mathematical model of the object can be the basis for development of automatic control system of water distribution. Such system will keep pressure and water consumption constant for the tiers of the scrubber at pre-set level and will provide the effective cleaning of blast-furnace gas, without regard to his pressure and charges fluctuation. The paper furnishes an example of the system of algebraic equations for the real data scrubber; the values of necessary pressure differentials of water for the tiers have been obtained

IMPLEMENTATION OF THE METHODS OF IDENTIFICATION OF STATIC CONTROL OBJECTS

One of the main tasks solved in the development of automatic control systems is the identification of the control object, which consists in obtaining its mathematical description. The nature and type of the mathematical model is determined by the goals and tasks for which it will be used. In the present case, the aim of obtaining the model is the synthesis of an automatic control system. Proceeding from the requirements of control problems, the identification problem consists in determining the structure and parameters of the mathematical model that ensure the best similarity of the model and object responses to the same input action. The article considers the experimental method of obtaining a mathematical description of the control object based on the results of measuring its input and output parameters and then processing the obtained results. The control object is the EP10 emulator made by the Oven Company, which is a miniature furnace. The emulator is used in experimental research in the process of commissioning using thermostat controls, and also applicable for educational purposes as part of training and research stands. As a result of structural identification with subsequent adjustment of the coefficients with the help of parametric identification, a model of the control object in the form of a second order aperiodic link is obtained. Parameters and type of the mathematical model allowed to make calculations and determine the parameters of adjustment of the TRM251 PID-controller. The software implementation of the automatic control system in the MatLAB environment made it possible to evaluate transient processes in a closed system. Thus, the calculation and analysis of the automatic control system in the first approximation were made. The final result can be obtained at the stage of commissioning the automatic temperature control system in the EP10 emulator using adaptation algorithms.

Development of Optimal Control Systems for Trickling Filter

This study aimed at developing and evaluating techniques for the development of automatic control systems for wastewater treatment systems involving trickling filter. The proposed control systems were established from the application of Optimal Control Theory, considering the use of a simplified dynamic model of the trickling filter. Computer simulations were used to assess the performance of the control systems proposed. The results showed that the dynamic model of the trickling filter utilized in this study was stable and suitable for the definition of control systems.

Development of automatic control system of underwater complex branch with flexible connections

Synthesis of automatic control systems (ACS) of spatial motion of underwater systems with flexible connections (USFC) forms the actual scientific problem. Own nonlinearity remotely operated underwater vehicle (ROV) enhanced nonlinearity flexible connections that make up USFC. Synthesis of ACS and USFC link forms the basis for automatic control of both onelink and multilink USFC. The method of the formalization of USFC structure is in the form of a graph model. It is represented on the basis of defined-controlled units of USFC. The method of inverse dynamics is synthesized from the regulators spatial movement of TPA and cable winches to control the length of the flexible part of the issued bonds. A BAC USFC link, which includes TPA, a cable winch and synthesized regulators, is the basis for the automation of spatial movement of onelink and multilink USFC. Computer simulation work of NAO investigates USFC link. The result is quite satisfactory for the automatic management of objects of such complexity.

Determination of transfer functions of the automatic electrohydraulic drive for special process equipment

This article discusses the improvement of special technological equipment due to the development of mathematical models of work processes that occur in the equipment and take into account the particular purpose of the process equipment. The main objective is to construct a mathematical model and obtaining the transfer functions of the electro-hydraulic drive equipment with passport data of standard devices and drive devices. The linearization of the mathematical model is made on the basis of the analysis of dynamic and statistical characteristics of work processes in equipment subject to a number of assumptions. The developed mathematical model and transfer function of the system allows you to perform a stability analysis, assessment of the quality of regulation and correction of dynamic characteristics based on passport data elements of the drive. The research results can be used by engineers involved in the development of automatic control systems of special technological equipment. A mathematical model is proposed in the work enables the development of automatic control system, which will expand the functionality and efficiency of special technological equipment.

An Auto-Tuning PI Control System for an Open-Circuit Low-Speed Wind Tunnel Designed for Greenhouse Technology.

Wind tunnels are a key experimental tool for the analysis of airflow parameters in many fields of application. Despite their great potential impact on agricultural research, few contributions have dealt with the development of automatic control systems for wind tunnels in the field of greenhouse technology. The objective of this paper is to present an automatic control system that provides precision and speed of measurement, as well as efficient data processing in low-speed wind tunnel experiments for greenhouse engineering applications. The system is based on an algorithm that identifies the system model and calculates the optimum PI controller. The validation of the system was performed on a cellulose evaporative cooling pad and on insect-proof screens to assess its response to perturbations. The control system provided an accuracy of <0.06 m·s−1 for airflow speed and <0.50 Pa for pressure drop, thus permitting the reproducibility and standardization of the tests. The proposed control system also incorporates a fully-integrated software unit that manages the tests in terms of airflow speed and pressure drop set points.

Research and Development of Automatic Control System for Electric Arc Furnace Electrode Positioning

The article is concerned with the advanced automatic control system of electrode positioning at electric arc steel making furnaces and ladle furnaces. Analysis of structure of modern electrode positioning control systems’ nonlinear controllers for electric arc furnaces and ladle furnaces is considered. Disadvantages of these systems were analyzed. A control system with a conventional structure from well-established foreign suppliers was compared with the advanced automatic control system of electrode positioning.

РАЗРАБОТКА АВТОМАТИЧЕСКОЙ СИСТЕМЫ УПРАВЛЕНИЯ

РАЗРАБОТКА АВТОМАТИЧЕСКОЙ СИСТЕМЫ УПРАВЛЕНИЯ

Desenvolvimento de sistema de Controle Ótimo para processo de tratamento de efluentes

Este trabalho teve por objetivo geral propor e avallar técnicas de desenvolvimento de sistemas de controle automático para processos de tratamento de efluentes envolvendo lodos ativados. Os sistemas de controle propostos foram estabelecidos a partir da aplicação da Teoria de Controle Ótimo, considerando o emprego de um modelo dinâmico simplificado do processo de lodos ativados. Simulações computacionais foram utilizadas para a avaliação do desempenho dos sistemas de controle propostos. Os resultados obtidos permitiram concluir que o modelo dinâmico do processo de lodos ativados utilizado neste trabalho, estabelecido a partir de uma simplificação de modelo largamente aceito, segundo literatura técnica corrente, mostrou-se estável e adequado à definição de sistemas de controle.