http://ea.donntu.ru/handle/123456789/1700 Tue, 21 Apr 2026 22:05:23 GMT 2026-04-21T22:05:23Z http://ea.donntu.ru/handle/123456789/22629 Title: ДИАГНОСТИКА МОМЕНТАЛЬНЫХ ТЕПЛОВЫХ БАЛАНСОВ ПЕЧИ ДЛЯ АНАЛИЗА ЭФФЕКТИВНОСТИ ТЕПЛОТЕХНИЧЕСКИХ ПАРАМЕТРОВ Authors: Скоробогатова, И.В.; Бирюков, Алексей Борисович; Гавриленко, Б.В.; Skorobogatova, I.; Biryukov, A.; Gavrylenko, B.; Скоробогатова, І.В.; Бірюков, Олексій Борисович; Гавриленко, Б.В. Abstract: Проведен анализ теплотехнических параметров, влияющих на качество нагрева заготовок в камерной печи. Получены динамические уравнения в периоды основного нагрева и выдержки металла в печи. Description: We analyze thermal parameters that affect the quality of billet heating in the chamber furnace. Dynamic equations were obtained during primary heating and during exposure of metal in the furnace. In the heat treatment chamber furnaces blanks controlled variable to implement diagnostics is the surface temperature of the material. It was determined that the normalized measure of the quality of the heating is heated by the thermal state of the billet At a certain approach to the installation of the sensors is possible to study the asymmetry of heat within the furnace. Measure the surface temperature of heated bodies in the furnace chamber pyrometers is a daunting technical challenge. A disadvantage of the known system of automatic control is the absence of current information about the actual heating of the metal. The use of a heat meter in the automatic control system will evaluate the current heat absorption of the metal and keep heating for a given temperature regime map. Increasing the value of the fuel utilization factor and reduce gas consumption can be achieved by lowering the temperature of flue gases. The problem can be solved by increasing the convective heat transfer coefficient or emissivity. It has been studied experimentally. It has been found that the use of pulsed mode will increase the heat transfer coefficient by 30-35% and to reduce the heating time by 15-20%. The implementation of the requirements of energy-saving technology to increase fuel efficiency requires a change in the number of operations in the automation of the furnace, and thus changes the functionality of the system being developed. This in turn complicates the concept of separate blocks and links and the use of additional control circuits. Enhanced functionality, improving performance of the furnace requires a change in the structure of the automation system thermal furnace. Tue, 01 Jan 2013 00:00:00 GMT http://ea.donntu.ru/handle/123456789/22629 2013-01-01T00:00:00Z http://ea.donntu.ru/handle/123456789/22627 Title: СОВЕРШЕНСТВОВАНИЕ МЕТРОЛОГИЧЕСКИХ ХАРАКТЕРИСТИК ТЕРМОКАТАЛИТИЧЕСКОГО ДАТЧИКА МЕТАНА Authors: Новиков, Е.Н.; Novikov, Ye.N.; Новіков, Є.М. Abstract: Выполнен анализ динамических процессов в термокаталитическом датчике метана. Рассмотрены параметры, влияющие на постоянную времени переходных процессов и способы её уменьшения. Показаны способы диагностики метрологических характеристик термокаталитического датчика метана. Description: Among all types of failures the explosions of methane and coal dust mixtures are of particular danger. They result in group accidents with lethality and great damage of equipment. Exploitation of the existing gas control facilities is connected with considerable running expenses conditioned by the necessity of periodic technical service and testing of measuring accuracy. The problems of gas control facilities automatic diagnostics have not been practically solved. Therefore diagnostics of catalytic methane sensor in the automatic mode requires practical realization. The analysis of dynamic processes in a methane sensor was performed. We considered the parameters influencing the constant of time transients and the methods of its reduction. The paper provides the methods of diagnostics of metrology descriptions of a catalytic methane sensor as well as the methods of diagnostics of dynamic and static parameters of thermocatalytic methane sensors. The new methods of control and indentification of dynamic errors of catalytic sensors are offered. The new methods of methane sensor sensitivity control by changing gas-exchange resistance are described. Tue, 01 Jan 2013 00:00:00 GMT http://ea.donntu.ru/handle/123456789/22627 2013-01-01T00:00:00Z http://ea.donntu.ru/handle/123456789/22626 Title: МАТЕМАТИЧЕСКОЕ ОПИСАНИЕ ОСНОВНЫХ ЗВЕНЬЕВ СИСТЕМЫ АВТОМАТИЧЕСКОГО РЕГУЛИРОВАНИЯ ВОДООТЛИВНОЙ УСТАНОВКИ Authors: Никулин, Эдуард Константинович; Неежмаков, Сергей Владимирович; Nikulin, E.; Nyeyezhmakov, S.; Нікулін, Едуард Констянтинович; Нєєжмаков, С.В. Abstract: Выполнен графоаналитический анализ работы шахтных водоотливных установок, оборудованных центробежными нагнетателями серийных типоразмеров. Установлены ранее неизвестные математические зависимости, позволяющие вычислить основные динамические параметры передаточных функций рассматриваемых основных звеньев системы регулирования шахтных водоотливных установок. Description: We defined the ranges of the process parameters of a sump installation in the area of industrial use of the pump. This will allow using a linear mathematical tool to describe the dynamic processes taking place in the controlled system. A study was conducted to increase the level of automation and improvement of technical and economic parameters of the drainage. It was found that the creation of an additional unit of pump installation in stationary mode will expand the functionality of control equipment. Functionally complete technological units for hydraulic circuit sump installation were considered. We performed a graph-analytical analysis of mine dewatering plants that are equipped with centrifugal superchargers. The main functionally complete units, which have been identified, and regulatory disturbances are considered. On the basis of the boundaries we defined changes in the main technological parameters of the control system. We have obtained previously unknown mathematical relationships that tie together the input and output actions. The effective methods of linearization and transformation of the approximating functions were identified. On this basis, the transfer functions were obtained. The research results do not contradict the basic assumptions of the theory of turbomachinery blade and control theory of objects of this class. Tue, 01 Jan 2013 00:00:00 GMT http://ea.donntu.ru/handle/123456789/22626 2013-01-01T00:00:00Z http://ea.donntu.ru/handle/123456789/22625 Title: ВИЗНАЧЕННЯ ТЕРМІНУ ПРОХОДЖЕННЯ СТРУМОМ ДВОХ ФІКСОВАНИХ РІВНІВ ЯК СПОСІБ ПРИСКОРЕННЯ ФУНКЦІЇ МАКСИМАЛЬНОГО СТРУМОВОГО ЗАХИСТУ Authors: Маренич, Костянтин Миколайович; Marenych, K.N.; Маренич, Константин Николаевич Abstract: Досліджені і проаналізовані параметри електричної мережі при виникненні трифазного короткого замикання в електротехнічному комплексі шахтної дільниці, визначений можливий інформаційний параметр, що дозволятиме підвищити швидкодію виявлення процесу короткого замикання. Description: A modern mine is an energy-intensive enterprise in which all the processes are electrified. The modern protection against short circuits is based on the method of measuring a parameter proportional to the electric current in the consumer’s cable, comparing this value with the maximum allowed and turning off the network, if the measured value is higher than the maximum parameter. The short circuit in the power supply has a high risk of fire or methane-air mixture explosion in the atmosphere. Improvement of technological equipment is a prerequisite for increasing cross sections of cables, increasing the power transformers. Therefore, the properties of the power to limit the short circuit current are reduced. The problem of limiting the thermal overload in case of short circuit can be solved by reducing the duration of identifying and disabling this dangerous process. From here follows the need for high-speed methods of detecting short circuits in electric power networks. An analysis of electric system, based on the measurement of the phase between the current and voltage, the speed of current increase in a mine electrical system and the combination of these methods is interesting. Tue, 01 Jan 2013 00:00:00 GMT http://ea.donntu.ru/handle/123456789/22625 2013-01-01T00:00:00Z