Енергетика та системи керування
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Item Математичне моделювання температурного режиму потоку газу в системах його обліку при імпульсних режимах роботи(Видавництво Львівської політехніки, 2013) Федоришин, Роман; Комарецький, Олександр; Чура, Мар’янThe mathematical model of the temperature regime of gas flow in a metering system is built based on the law of conservation of energy. Using the developed model the transient processes are simulated and compared to the results of experimental studies. On the basis of verification of the developed model it was defined that the maximum absolute deviation of the simulated values from the experimental results was 0.73 ºC. The developed model provides the possibility to define the systematic error of natural gas flow temperature measurement caused by inertia of the thermometer in pulse regimes of flow. The pulse regime of flow is present in natural gas metering systems installed in boiler houses where the switching on and off of the boiler leads to the pulse regime of gas consumption. Ways to define and eliminate the systematic error of flow temperature measurement caused by inertia of the thermometer in pulse regimes of flow are proposed in this paper in order to improve the accuracy of natural gas metering.Item Планування виробничих експериментів для багатофакторного дослідження технології сушіння торфу в парових трубчатих сушарках(Видавництво Львівської політехніки, 2013) Кулаковський, Леонід; Алтухов, ЄвгенійThe paper highlights the necessity for planning the experiment in steam pipe dryers of peat for multivariate investigation of the drying process and for further searching power saving regimes of drying. Analysis of plans of experiments allowed to identify the main criteria for the construction plan of the experiment in steam pipe dryer. The basis for the planning of the experiment should take regime maps of tube steam dryers, which provide required quality of a dried peat and changing of control actions carry out in the range of operating conditions. In order to decrease the number of experiments, and also not to rid planning matrix its best features is necessary to develop fractional factorial experiment (FFE) and to identify fractional replica. The optimal experiment’s plan for creating a mathematical model of the drying process is FFE 25-1 with shoulder g=1 and experiments in the center of the plan.Item Моделювання процесів в теплоенергетиці за допомогою використання дробових похідних(Видавництво Львівської політехніки, 2013) Кравець, Тарас; Кузнецова, МартаSymbolic models of technological processes in the heat power engineering, based on classic differential equations, fail to provide certainty in some cases and may contain considerable skewing. The object of this research is dynamic and static processes of heat power systems, that are described by means of differential equations of fraction order, specifically, the processes of temperature alternation in heat-exchange units. The aim of the article is to use the method of reduction of order to provide analytical solution of heat and mass transfer problems in different environments, with different boundary conditions, for flat, cylindrical and spherical surfaces on the edge of heat carriers in motion. The paper reveals, that the use of the theory of fractional estimation to describe the processes of coordinate alternation in heat-exchange units allows finding solution in the cases of other mathematical methods inefficiency.Item Mathematical model of the inertial object programmed control method(Видавництво Львівської політехніки, 2011) Gapon, Anatoly; Savitskiy, Sergey; Rudakova, NataliaThe article deals with the development of the extrapolator mathematical model of the software management system for the objects with the distributed parameters, which possess properties of the linear object with self-alignment.