scholarly journals Boiler drum automatic power management system

2020 ◽  
Vol 222 ◽  
pp. 01009
Author(s):  
Tatiana Efremova ◽  
Sergey Shchegolev
Keyword(s):  
Automatic Control ◽  
Transfer Functions ◽  
Dynamic Properties ◽  
Block Diagram ◽  
Control Object ◽  
Feed Water ◽  
Boiler Drum ◽  
Action Models ◽  
Working Out ◽  
Feed Water Temperature

Dynamic properties of boiler sections as control objects are studied. The requirements for mathematical models and the main adjustable parameters in drum boilers are determined, on the basis of which the requirements for the designed model are made. The construction of a block diagram and calculation of transfer functions of the automatic control system of the control object. The main types of disturbances are determined: feed water and steam consumption, consumer load, fuel consumption, and feed water temperature. Each perturbation is represented as a control action. Models of the object using perturbation channels are obtained. The article considers the construction of an effective model of the system of automatic control of the drum boiler power supply based on the system’s working out of disturbing influences. The paper uses the Matlab application software and the Simulink graphical programming environment.

Automation of Concrete Heat Treatment in Thermoactive Formwork in Monolithic Housing Construction

2020 ◽  
Vol 897 ◽  
pp. 250-254
Author(s):  
Anatoly Fedorovich Tikhonov
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Control System ◽  
Transfer Functions ◽  
Block Diagram ◽  
Control Object ◽  
Housing Construction ◽  
Control Actions ◽  
Concrete Mix ◽  
Concrete Temperature

The block diagram and algorithm for concrete treating in thermoactive formwork is presented. Article presents parameters of the concrete mix, to enter in a command block before automated heating of the concrete mix in thermoactive formwork in accordance with the schedule of changes in concrete temperature in the process of obtaining desired strength. Article formulates mathematical model of the control object for thermal treatment of concrete with consideration of the specifics and general patterns, processes and technological requirements. Article determined control actions, transfer functions of the object and phase graph of the control system.

scholarly journals АЛГОРИТМЫ УПРАВЛЕНИЯ УГЛОВЫМ ДВИЖЕНИЕМ КОРОМЫСЛА С ВИНТОВЫМИ ЭЛЕКТРОПРИВОДАМИ

2020 ◽  
pp. 44-59
Author(s):  
Анатолий Степанович Кулик ◽  
Константин Юрьевич Дергачев ◽  
Сергей Николаевич Пасичник ◽  
Юрий Александрович Немшилов
Keyword(s):  
Automatic Control ◽  
State Space ◽  
Mathematical Description ◽  
Transfer Functions ◽  
Control Object ◽  
The State ◽  
Angular Motion ◽  
Synthesis Process ◽  
Electric Actuator ◽  
Functional Features

The subject of study in the article is the process of forming algorithms for controlling the angular motion of the rocker with a screw electric actuator. The purpose is to develop approaches to the formation of algorithms for controlling the angular motion of the rocker with a screw electric actuator as the automatic control object. Tasks: to specify the synthesis process of the state control algorithm for a linear mathematical description of the automatic control object in the state space according to the minimum criterion of the integral from the weighted error module. To form the block diagram of the automatic control system by the state. To improve the approach to the development of algorithms for controlling automatic control objects by output for mathematical description in the frequency domain. To illustrate the features of the approach on the specific example of automatic control object represented by transfer functions in terms of references and disturbances. To develop the simulation scheme in Simulink and study the reactions to stepwise references and disturbances. To develop the approach to the formation of control algorithms for the diagnosis of the rocker as the automatic control object. To describe the procedure and means of deep diagnosis of emergency situations of the automatic control object. To develop means of recovery the automatic control object. The methods used are the state space method, transfer function method, integral optimality criteria, methods of diagnosing, and recovering. The following results were obtained: approaches to the formation of algorithms for controlling the angular motion of the rocker with a screw electric actuator using linear mathematical descriptions in time and frequency domains were formed. Conclusions. The scientific novelty lies in the formation of approaches to the development of algorithms for controlling the angular position of the rocker with a screw electric actuator which differs from the known accounting the structural and functional features of the automatic control object.

scholarly journals TECHNOLOGICAL FEATURES OF AUTOMATIC CONTROL OF LONG FIBRE PRODUCTION

2020 ◽  
pp. 3-6
Author(s):  
L. V. Mochalov ◽  
V. G. Drozdov
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Negative Feedback ◽  
Block Diagram ◽  
Control Object ◽  
Fibre Production ◽  
Flax Fibre ◽  
Movement Speed ◽  
The Way

Machines for producing flax fibre as automatic control objects are described in this article. Versions of control of drying machine by control of amount of supplied heat, intensity of replacement of spent drying agent with fresh one, change of drying agent speed in drying region, change of material movement speed in drying space are considered. It is shown that what is the most rational way of controlling the moisture of retted straw is the way that uses a closed control system with negative feedback. The block diagram of the automatic drying control system that acts on the control object, in this case on the dryer, through the actuator, in order to reduce the amount of humidity deviation depending on the amount and the sign of deviation, is developed.

scholarly journals MODELING OF PHYSICAL PROCESSES OF ENERGY CONVERSION IN SMALL-SIZED VORTEX ENERGY SEPARATORS

2021 ◽  
pp. 20-30
Author(s):  
Anatoliy Kulik ◽  
Sergey Pasichnik ◽  
Dmytro Sokol
Keyword(s):  
Mathematical Model ◽  
Automatic Control ◽  
Energy Conversion ◽  
Gas Flow ◽  
Dynamic Properties ◽  
Full Range ◽  
Control Object ◽  
Parametric Identification ◽  
Static Characteristics ◽  
Physical Processes

The object of study in the article is the vortex effect of temperature separation in a rotating gas flow, which is realized in small-sized vortex energy separators. The subject matter is the models that describe the physical processes of energy conversion in small-sized vortex energy separators as objects of automatic control. The goal is to obtain models of a vortex energy separator reflecting its static and dynamic properties as an automatic control object. The tasks to be solved are: to develop a three-dimensional computer model of a small-sized vortex energy separator which will allow analyzing the parameters of the gas flow and physical processes of energy conversion directly inside the object and obtaining its static characteristics. A linearization method of static characteristics on the interval of input and output values is proposed which will expand the operating range without loss of linearization accuracy. A method of structural-parametric identification based on experimental logarithmic magnitude-frequency characteristics is proposed which will allow for the same set of experimental points to select the structure of the mathematical model of varying complexity depending on the specified accuracy. As a result of the work, the scheme for modeling the automatic control object was formed, consisting of the drive unit, sensor unit, and vortex energy separator, with the reflection of all the obtained operating modes. The methods used are the method of graphic linearization, Laplace transform, structural-parametric identification. The following results were obtained: a computer and linearized mathematical model of the small-sized vortex energy separator as an automatic control object reflecting its properties in the time and frequency domains was obtained. A comparative analysis of the reactions of the model and the real object to the same input action was carried out. Conclusions. The scientific novelty of the results obtained is as follows: 1) multiple graphic linearizations of one static characteristic to use the full range of the operation mode of vortex energy separator, which distinguishes it from the known;2) mathematical model structural-parametric identification for vortex energy separator with the help of known points of the Bode magnitude plots by using the interpolation polynomial and its derivatives graphs.

scholarly journals АНАЛИТИЧЕСКОЕ КОНСТРУИРОВАНИЕ РАЗОМКНУТЫХ СИСТЕМ СТОХАСТИЧЕСКОГО УПРАВЛЕНИЯ МНОГОМЕРНЫМ НЕЛИНЕЙНЫМ ОБЪЕКТОМ

2017 ◽  
Vol 8 (3) ◽  
Author(s):  
Л. Н. Блохин ◽  
С. И. Осадчий ◽  
В. А. Зозуля
Keyword(s):  
Control System ◽  
Transfer Functions ◽  
Block Diagram ◽  
Control Object ◽  
Metrological Certification ◽  
Open Loop ◽  
Problem Solution ◽  
Loop Control ◽  
Control Signals ◽  
Random Components

This article is devoted to the development of a new method of synthesis a regulators’ transfer functions matrix of an optimal multivariable open-loop control system. The regulator is designed to maximize an accuracy of a nonlinear multivariable control object transition from one steady state to another. It is assumed that disturbances act on the control object and sensors measuring data has inertia and noise. Both disturbances and noises are an additive combination of regular and random components. Random components belong to a class of interconnected stationary processes with rational spectral density matrices. A substantiated method differs from the known one by the fact that during formulation and solution of the problem somebody uses a new block diagram of the control system, which takes into account the results of metrological certification of a sensor dynamics. Synthesis of the regulator is carried out in the frequency domain by the Wiener-Kolmogorov method. A new algorithm, which is obtained as a result of synthesis problem solution, allows you to find the matrix of regulator transfer functions , which provides a minimum of corresponding quadratic quality criteria’s. The first of them is equal to the sum of certain way weighted squared deviations regular repetition errors of the object path and control signals. The second criterion is equal to the sum of the weighted variance of the random error components and the control signals. To execute the proposed algorithm it is necessary to perform the operations of Wiener factorization and separation of rational matrices. The corresponding functions are contained in the freely distributed software package SciLab.

scholarly journals Research of the control system for liquids level maintenance in tanks

2021 ◽  
Vol 29 (1) ◽  
pp. 104-119
Author(s):  
Aleksandr M. Abakumov ◽  
Pavel K. Kuznetsov ◽  
Vladimir P. Kurgan ◽  
Alecsandr A. Goryachkin
Keyword(s):  
Control System ◽  
Quality Indicators ◽  
Transfer Functions ◽  
Block Diagram ◽  
Control Process ◽  
Control Object ◽  
Liquid Level ◽  
Nonlinear Dependence ◽  
Level Control ◽  
Stabilization Control

The problems of controlling the operating modes of pumping units with a frequency-controlled drive based on an asynchronous short-circuited motor are considered. The specific features of the requirements for the control process quality indicators of liquid level stabilization control system for the reservoirs are discussed. Mathematical models of functionally necessary parts of the system are obtained in the form of transfer functions: a frequency-controlled drive with scalar control, a generalized control object, and a feedback sensor. The linearized model of the controlled object taking into consideration a nonlinear dependence of the the torque at the motor shaft on rotational speed is obtained in the form of a transfer function of the aperiodic unit. A block diagram of a closed loop liquid level control system has been developed. It is shown that the use of standard settings for the system under consideration, focused on maximum performance achievement, can leads to unacceptable values of control action speed variations and hence to generation of hydraulic shocks that decreases a wear of kinematic parts of the unit. A method for the synthesis of the controller is proposed, which takes into account the limitations on the quality indicators of the transient process of a speed variation of the pump unit when control system counteracts main disturbances. The synthesis of controller is carried out for an example of a specific installation and the results of modeling transients of a control system and perturbing effects are discussed.

Synthesis of a Scalar Automatic Control System of a Valve Engine with Field Control for a Rowing Electric Installation with an Azipod Propulsion and Steering System

2021 ◽  
Vol 64 (6) ◽  
pp. 29-35
Author(s):  
Vitaly Vysotsky ◽  
◽  
Igor Markov ◽  
Yuri Matveev ◽  
◽  
...  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Electric Drive ◽  
Structural Complexity ◽  
Control Object ◽  
Steering System ◽  
Synchronous Machine ◽  
Object A ◽  
Valve Engine

The article deals with the main trends in the development of marine automatic AC electric drive systems. A variant of the implementation of an electric drive using an electromechanical converter of a synchronous machine with electromagnetic field excitation is presented. A promising electric drive system with a valve engine for the icebreaker's with the Azipod propulsion and steering system is proposed. The aim of the work is to eliminate the structural complexity and expand the functional capabilities of the electric drive by using a scalar automatic control system of the frequency of rotation in the two-zone control of the valve motor of the EPS. The novelty lies in the use of the approach and representation of the control object-a valve motor as an analog of a DC collector motor controlled by an armature and by a field. The analysis of control processes is directly related to the processes of electromechanical energy conversion occurring in a synchronous machine.

Using Sliding Mode Control to Adjust Drum Level of a Boiler Unit With Time Varying Parameters

2010 ◽  
Author(s):  
Hamed Moradi ◽  
Firooz Bakhtiari-Nejad ◽  
Majid Saffar-Avval ◽  
Aria Alasty
Keyword(s):  
Water Level ◽  
Transfer Functions ◽  
Sliding Mode ◽  
Operating Conditions ◽  
Model Parameters ◽  
Feed Water ◽  
Time Varying ◽  
Boiler Unit ◽  
Varying Parameters ◽  
Time Varying Parameters

Stable control of water level of drum is of great importance for economic operation of power plant steam generator systems. In this paper, a linear model of the boiler unit with time varying parameters is used for simulation. Two transfer functions between drum water level (output variable) and feed-water and steam mass rates (input variables) are considered. Variation of model parameters may be arisen from disturbances affecting water level of drum, model uncertainties and parameter mismatch due to the variant operating conditions. To achieve a perfect tracking of the desired drum water level, two sliding mode controllers are designed separately. Results show that the designed controllers result in bounded values of control signals, satisfying the actuators constraints.

scholarly journals Dynamic control of maximal ventricular elastance via the baroreflex and force-frequency relation in awake dogs before and after pacing-induced heart failure

2010 ◽  
Vol 299 (1) ◽  
pp. H62-H69 ◽  
Author(s):  
Xiaoxiao Chen ◽  
Javier A. Sala-Mercado ◽  
Robert L. Hammond ◽  
Masashi Ichinose ◽  
Soroor Soltani ◽  
...  
Keyword(s):  
Heart Failure ◽  
Transfer Function ◽  
Transfer Functions ◽  
Dynamic Properties ◽  
System Response ◽  
Force Frequency ◽  
Arterial Baroreflex ◽  
Ventricular Elastance ◽  
Arterial Blood ◽  
Frequency Relation

We investigated to what extent maximal ventricular elastance ( Emax) is dynamically controlled by the arterial baroreflex and force-frequency relation in conscious dogs and to what extent these mechanisms are attenuated after the induction of heart failure (HF). We mathematically analyzed spontaneous beat-to-beat hemodynamic variability. First, we estimated Emax for each beat during a baseline period using the ventricular unstressed volume determined with the traditional multiple beat method during vena cava occlusion. We then jointly identified the transfer functions (system gain value and time delay per frequency) relating beat-to-beat fluctuations in arterial blood pressure (ABP) to Emax (ABP→ Emax) and beat-to-beat fluctuations in heart rate (HR) to Emax (HR→ Emax) to characterize the dynamic properties of the arterial baroreflex and force-frequency relation, respectively. During the control condition, the ABP→ Emax transfer function revealed that ABP perturbations caused opposite direction Emax changes with a gain value of −0.023 ± 0.012 ml−1, whereas the HR→ Emax transfer function indicated that HR alterations caused same direction Emax changes with a gain value of 0.013 ± 0.005 mmHg·ml−1·(beats/min)−1. Both transfer functions behaved as low-pass filters. However, the ABP→ Emax transfer function was more sluggish than the HR→ Emax transfer function with overall time constants (indicator of full system response time to a sudden input change) of 11.2 ± 2.8 and 1.7 ± 0.5 s ( P < 0.05), respectively. During the HF condition, the ABP→ Emax and HR→ Emax transfer functions were markedly depressed with gain values reduced to −0.0002 ± 0.007 ml−1 and −0.001 ± 0.004 mmHg·ml−1·(beats/min)−1 ( P < 0.1). Emax is rapidly and significantly controlled at rest, but this modulation is virtually abolished in HF.

scholarly journals МЕТАЛОГІДРИДНИЙ АКУМУЛЯТОР-КОМПРЕСОР ВОДНЮ З АВТОМАТИЧНОЮ СИСТЕМОЮ УПРАВЛІННЯ ТА КОНТРОЛЮ

2020 ◽  
pp. 53-60
Author(s):  
Михайло Романович Ткач ◽  
Борис Георгійович Тимошевський ◽  
Аркадій Юрійович Проскурін ◽  
Юрій Миколайович Галинкін
Keyword(s):  
Automatic Control ◽  
Metal Hydride ◽  
Block Diagram ◽  
Automatic Monitoring ◽  
Outer Side ◽  
Piping System ◽  
Air Cooling ◽  
Monitoring And Control ◽  
Compression Pressure ◽  
Made In

A project of metal hydride hydrogen compressor is presented, which can be used as an element of refueling complexes, hydrogen storage and compression systems. The capacity of the developed sample is 40 kg of hydrogen, the mass is 4,8 ton, and the maximum compression pressure is 15 MPa. The base metal hydride material on the basis of which this compressor battery model is developed is LaNi4.5Al0.5. the sorption capacity of hydrogen of which is determined experimentally, and is at least 1.38 % by weight. A feature of the developed compressor battery is the use of air cooling, the presence of an automatic monitoring and control system, I allow a number of operations to be performed in automatic mode, and the use of software, electrical and automatic protection against overpressure. Each accumulator-compressor is made in the form of a steel box in which six blocks (capsules) are placed. The block, respectively, is made in the form of a steel coaxial multilayer cylinder, on the outer side of which there is a heating element and a layer of thermal insulation. In the middle of the cylinder is a sealed capsule filled with metal hydride material. Capsules are interconnected with the collector through a piping system. Also, the piping system is equipped with an inlet valve connecting the volume formed with an external receiver. The battery-compressor is equipped with an external receiver, to which a hydrogen, vacuum, nutrient and consumable outline is connected. Each circuit is equipped with an electromagnetic valve, as well as measuring devices, which makes it possible to carry out automatic control of parameters and automatic control of the device in accordance with the operating mode. A list of equipment is presented, on the basis of which a system of automatic control and monitoring, a block diagram of the main operating modes, an interface of the developed software are developed. Depending on the mode chosen by the operator, the automatic control and monitoring system allows activation of metal hydride materials, purification of contaminants of harmful impurities, sorption and desorption of hydrogen.

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