https://sci.ldubgd.edu.ua/jspui/handle/123456789/971 Fri, 09 Jan 2026 01:50:58 GMT 2026-01-09T01:50:58Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/3389 Title: Математичне моделювання процесів в електроприводі водяного насоса з акумуляторними батареями  Authors: Боднар, Григорій; Шаповалов, Олег; Федишин, Ярослав; Гембара, Тарас Abstract: We consider scheme of power supplies of the water pump's electric drive of increase of water pressure of system of internal fire water supply from the backup source with batteries and autonomous voltage inverter, its mathematical model and simulation results of electromagnetic and of electromechanical processes in the engine during start–up and operation of the pump in absence of the main power on the network, that provides use internal fire water supply at extraordinary situations during the estimated time. This reserve system can also be used to support the continuity of processes. General mathematical model of electric drive formed with mathematical models of individual elements of the scheme represented of multipoles, and the processes in them describe a closed system of equations – differential, algebraic and logical. The estimated model of electric drive formed by the connection between the external branches of individual elements–multipoles, namely the power supply with the battery, inverter voltage (cathode and anode of valve group), transformers and induction motor. The way connection between the external branches of individual elements–multipoles mathematically described of matrices connections that draw up for each item on the principle: the number of rows equal number of independent units of the scheme and the number of columns equal to the number of external branches of element. Calculating implemented by language of FORTRAN. Common routines designed to perform mathematical operations on matrices; numerical integration of differential equations by the Runge–Kutta 2nd order; solution systems of algebraic equations by Gauss; definition moment of natural closing valves. The results of modeling the direct start induction motor from the network , the stator current; rotor's angular velocity and electromagnetic torque and moment loads was set. The calculation results confirmed those of experimental studies, almost identical curves of current and voltage induction motor from the network and independent source of battery at start–up and operation of the pump, the shape of the output voltage source and a pressure of pump during continuous operation of the electric pump. Tue, 01 Nov 2016 00:00:00 GMT https://sci.ldubgd.edu.ua/jspui/handle/123456789/3389 2016-11-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/3388 Title: ВПЛИВ НАВОДНЮВАННЯ СТІНКИ КОЛЕКТОРА БАРАБАНА ПАРОВОГО КОТЛА НА ЙОГО МІЦНІСТЬ ТА ДОВГОВІЧНІСТЬ ЗА ТЕРМОЦИКЛЮВАННЯ Authors: Гембара, Оксана; Чепіль, Ольга; Гембара, Тарас; Гвоздюк, Микола Abstract: The cyclic resource of the collector drum of boiler from exposure to the entire spectrum of unsteady regimes during its operation estimated using the criterion of limit accumulated damage. It was found that most damages occured on the outer wall of the drum in the vicinity of holes. A study of different forms of holes and found that the maximum local stresses occur in the vicinity of the hole at the peak of holes. It was shown that circular holes are the most optimal form because lifetime of collector with such holls is 40% larger than with the holes elliptical shapes. Hydrogen reduces longevity drum for all forms holes for the investigational treatment burden to 30%. Sun, 01 May 2016 00:00:00 GMT https://sci.ldubgd.edu.ua/jspui/handle/123456789/3388 2016-05-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/2187 Title: РАСЧЕТНЫЙ МЕТОД ЭКСПЕРТНОЙ ОЦЕНКИ ПРОГНОЗИРОВАНИЯ ЧРЕЗВЫЧАЙНЫХ СИТУАЦИЙ ДЛЯ ЭКСПЛУАТАЦИИ ОБОРУДОВАНИЯ В ВОДОРОДНОЙ СРЕДЕ Authors: Боднар, Григорій Йосипович; Гембара, Тарас Васильович Abstract: Исследование накопления и перераспределения водорода в металле оборудования осуществлено математическим моделированием с помощью уравнений математической физики параболического типа. Концентрацию водорода находят из решения дифференциального уравнения в частных производных 2-го порядка в одномерном приближении. Fri, 01 Jan 2016 00:00:00 GMT https://sci.ldubgd.edu.ua/jspui/handle/123456789/2187 2016-01-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/2184 Title: Математичне моделювання електромеханічних систем з автономним електроживленням Authors: Боднар, Григорій Йосипович; Гембара, Тарас Васильович; Шаповалов, Олег Валерійович Abstract: Researched electric drive of water pump to increase water pressure of internal fire water supply, which is powered by redundant power with batteries and autonomous voltage inverter. The mathematical model of electric drive and presents the results of simulations of electromagnetic and electromechanical processes in the engine during start-up and operation of the pump. Fri, 01 Jan 2016 00:00:00 GMT https://sci.ldubgd.edu.ua/jspui/handle/123456789/2184 2016-01-01T00:00:00Z