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Dissertations / Theses on the topic "621.317.42"
Світлична, Олена Євгеніївна. "Вибір параметрів ефективних засобів блискавкозахисту електроенергетичних об'єктів за допомогою моделювання електрофізичних процесів." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19651.
Full textThesis for scientific degree of candidate of technical sciences, specialty 05.14.02 – electrical power stations, networks and systems. - National Technical University "Kharkov Polytechnic Institute", Kharkov 2016. The thesis is devoted to solution of modern scientific and technical problem of choosing of the parameters of effective means of lightning protection of electric power facilities using advanced models the electrical processes in the final stages of motion of leader channel of lightning to the ground with regard of the possibility of appearance of an ascending leader from grounded objects. A statistical model for determination of the probability of lightning strokes at objects on the ground, taking into account their height and size, as well as probabilities of development of ascending sparks from them, based on the usage of experimental data on the parameters of lightning and the electrical physical processes at breakdown of long air gaps has been proposed. The results of experimental studies of the correlation between the intensity of corona from earthed electrodes (simulate a lightning rod in a thunderstorm situation) and probability of being hit by a high-voltage impulse discharges (simulate lightning strike) have been presented.
Светличная, Елена Евгеньевна. "Выбор параметров эффективных средств молниезащиты электроэнергетических объектов с помощью моделирования электрофизических процессов." Thesis, НТУ "ХПИ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19652.
Full textThesis for scientific degree of candidate of technical sciences, specialty 05.14.02 – electrical power stations, networks and systems. - National Technical University "Kharkov Polytechnic Institute", Kharkov 2016. The thesis is devoted to solution of modern scientific and technical problem of choosing of the parameters of effective means of lightning protection of electric power facilities using advanced models the electrical processes in the final stages of motion of leader channel of lightning to the ground with regard of the possibility of appearance of an ascending leader from grounded objects. A statistical model for determination of the probability of lightning strokes at objects on the ground, taking into account their height and size, as well as probabilities of development of ascending sparks from them, based on the usage of experimental data on the parameters of lightning and the electrical physical processes at breakdown of long air gaps has been proposed. The results of experimental studies of the correlation between the intensity of corona from earthed electrodes (simulate a lightning rod in a thunderstorm situation) and probability of being hit by a high-voltage impulse discharges (simulate lightning strike) have been presented.
Волоський, Володимир Петрович, and Volodymyr Voloskyi. "Програмно-апаратне забезпечення системи контролю Li-ion акумуляторних батарей." Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2021. http://elartu.tntu.edu.ua/handle/lib/36533.
Full textВСТУП 10 РОЗДІЛ 1 АНАЛІЗ ПРЕДМЕТНОЇ ОБЛАСТІ ТА ОГЛЯД ІСНУЮЧИХ СИСТЕМ КОНТРОЛЮ АКУМУЛЯТОРНИХ БАТАРЕЙ 13 1.1 Призначення системи контролю Li-ion акумуляторів 13 1.2 Повторне використання Li-ion акумуляторів 16 1.3 Методи зарядки Li-ion акумуляторів 18 1.4 Методи захисту акумуляторних батарей реалізовані на BMS 19 1.5 Огляд існуючих систем безперебійного живлення на базі Li-ion акумуляторів 21 1.6 Висновки до розділу 1 24 РОЗДІЛ 2 ВИБІР ЗАСОБІВ ТА МЕТОДІВ ДЛЯ ПРИСТРОЮ BMS 26 2.1 Вибір алгоритму балансування 26 2.2 Алгоритм визначення внутрішнього опору Li-ion акумулятора 31 2.3 Опис алгоритм створення таблиці OCV 33 2.4 Вибір мікросхеми датчика струму 35 2.5 Вибір мікросхеми BMB 39 2.6 Висновки до розділу 2 42 РОЗДІЛ 3 РОЗРОБКА ТА ТЕСТУВАННЯ АПАРАТНО - ПРОГРАМНОЇ ЧАСТИНИ 43 3.1 Розробка плати BMS 43 3.2 Розробка алгоритму балансування 45 3.2 Тестування алгоритму визначення внутрішнього опору батареї 48 3.3 Тестування алгоритму створення таблиць OCV 50 3.4 Тестування алгоритму визначення температури 52 3.5 Тестування алгоритму балансування 54 3.6 Висновки до розділу 3 58 РОЗДІЛ 4 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ 59 4.1 Охорона праці 59 4.2 Інженерний захист персоналу об’єкту та населення 61 4.3 Висновки до розділу 4 63 ВИСНОВКИ 65 СПИСОК ВИКОРИСТАНИХ ДЖЕРЕЛ 67 ДОДАТОК А 70 ДОДАТОК B 77
Сергєєв, Дмитро Віталійович. "Імітатор магнітного поля для наносупутників." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/44626.
Full textThis paper describes the process of creating a control system for a magnetic field simulator, which will be used to test the orientation and stabilization subsystem of nanosatellites of Igor Sikorsky Kyiv Polytechnic Institute. The design and principle of operation of magnetic simulators are considered. The analysis of existing analogues of the control system was carried out. Based on the results of the analysis, it was decided to use the pulse regulation method and the bridge circuit of the regulator. The structural and schematic diagrams of the device were developed. The necessary components were selected and an experimental system layout was created, for which software was written. A test was performed, during which significant current ripple in the simulator coils was detected. To reduce ripple, the output filter for the coil driver was calculated and created. The calculation results are confirmed by experimental data.
Гетьман, Андрій Володимирович. "Аналіз та синтез структури магнітного поля технічних об'єктів на основі просторових гармонік." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39626.
Full textDissertation for the degree of Doctor of Technical Sciences in the specialty 05.09.05 – theoretical electrical engineering (141 – electric power engineering, electrotechnics and electromechanics). – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The dissertation is devoted to solve the actual scientific problem of the development of theoretical bases, analysis and synthesis methods and means of the spatial structure of the stationary magnetic field of technical objects on the basis scalar potential’s of elongated spheroidal, spherical, flattened-spheroidal, and cylindrical harmonics. In the thesis substantiated practical application principles of spatial harmonic analysis of the magnetic field near the technical objects (TO) surface, taking into account their forms peculiarities. To use as a theoretical basis for the synthesis of magnetic fields current sources, the generalized vector’s potential representation is obtained in the form of its interrelation with elongated-spheroidal, spherical and oblate-spheroidal harmonics of the scalar potential of the magnetic field. The experimental determination method of amplitude coefficients of spatial harmonics, based on the generalized representation of spherical and spheroidal harmonics of the magnetic field, is developed for practical determination of the spatial structure of the magnetic field near the surface of technical objects, using a single experimental-methodical basis. The method for practical determination of the values of the 24 amplitude coefficients of spherical harmonics of a magnetic field by means of a system of circular contour windings using, in the mathematical processing of rotational signatures, the property of reducing the relative contribution to the measured magnetic flux from the harmonics of the higher power magnetic field when moving away from the surface of TO is developed. The method of experimental determination of multipole magnetic moments, based on integral processing of pass-through characteristics of three magnetics induction projections, fixed near the technical object, with its linear displacement, is developed. The classification of methods and means of experimental spherical harmonic’s determination of technical object’s magnetic field is fulfilled. The principles of system’s construction for experimental determination of spatial harmonics of magnetic field TO are substantiated. An analytical electromagnet’s model of the magnetic field, based on a cylindrical harmonic analysis of the inductive magnetization of its ferromagnetic core, was developed to find cylindrical electromagnet’s parameters with a maximum-created magnetic moment. To create a quadrupole electromagnet with the given quality of the magnetics field spatial structure, a method for minimizing the contributions of nonquadrupture intermediate-integral lengths of the magnetic induction coefficients in the aperture, based on their found relationship with the parameters of the floors yarn construction and the superconducting current winding, was developed.
Гетьман, Андрій Володимирович. "Аналіз та синтез структури магнітного поля технічних об'єктів на основі просторових гармонік." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39623.
Full textDissertation for the degree of Doctor of Technical Sciences in the specialty 05.09.05 – theoretical electrical engineering (141 – electric power engineering, electrotechnics and electromechanics). – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The dissertation is devoted to solve the actual scientific problem of the development of theoretical bases, analysis and synthesis methods and means of the spatial structure of the stationary magnetic field of technical objects on the basis scalar potential’s of elongated spheroidal, spherical, flattened-spheroidal, and cylindrical harmonics. In the thesis substantiated practical application principles of spatial harmonic analysis of the magnetic field near the technical objects (TO) surface, taking into account their forms peculiarities. To use as a theoretical basis for the synthesis of magnetic fields current sources, the generalized vector’s potential representation is obtained in the form of its interrelation with elongated-spheroidal, spherical and oblate-spheroidal harmonics of the scalar potential of the magnetic field. The experimental determination method of amplitude coefficients of spatial harmonics, based on the generalized representation of spherical and spheroidal harmonics of the magnetic field, is developed for practical determination of the spatial structure of the magnetic field near the surface of technical objects, using a single experimental-methodical basis. The method for practical determination of the values of the 24 amplitude coefficients of spherical harmonics of a magnetic field by means of a system of circular contour windings using, in the mathematical processing of rotational signatures, the property of reducing the relative contribution to the measured magnetic flux from the harmonics of the higher power magnetic field when moving away from the surface of TO is developed. The method of experimental determination of multipole magnetic moments, based on integral processing of pass-through characteristics of three magnetics induction projections, fixed near the technical object, with its linear displacement, is developed. The classification of methods and means of experimental spherical harmonic’s determination of technical object’s magnetic field is fulfilled. The principles of system’s construction for experimental determination of spatial harmonics of magnetic field TO are substantiated. An analytical electromagnet’s model of the magnetic field, based on a cylindrical harmonic analysis of the inductive magnetization of its ferromagnetic core, was developed to find cylindrical electromagnet’s parameters with a maximum-created magnetic moment. To create a quadrupole electromagnet with the given quality of the magnetics field spatial structure, a method for minimizing the contributions of nonquadrupture intermediate-integral lengths of the magnetic induction coefficients in the aperture, based on their found relationship with the parameters of the floors yarn construction and the superconducting current winding, was developed.
Голуб, Екатерина Юрьевна. "Методы и средства повышения точности диэлькометрических влагомеров." Thesis, Национальный аэрокосмический университет им. Н. Е. Жуковского "Харьковский авиационный институт", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22690.
Full textThesis for the degree of Ph. D. in Engineering Science, specialty 05.11.13 – devices and methods of testing and determination of substances structure. – National Technical University "Kharkiv Polytechnic Institute" Ministry of Education and Science of Ukraine, Kharkiv, 2016. Thesis is devoted to accuracy increase for capacitive moisture meters by improving and developing of the methods and means allowing to reduce "uncertainty of substance type" of measurements by these moisture meters. In the thesis the test algorithms of substances moisture determination allowing to compensate "uncertainty of substance type" of measurements by capacitive moisture meters are proposed: the first test algorithm in which as test influences an additive and multiplicative tests are applied; the second test algorithm in which except additive and multiplicative tests a combined test is carried out. Comparative analysis of the received test algorithms with the best of the found analogs is carried out. Capacitive primary converter of adaptive moisture meter for bulk and liquid substances moisture measurements is developed for realization of the proposed test algorithms. The calibration methodology for primary converter on the basis of oven-drying moisture determination method is given. The mathematical model of measuring process for bulk substances moisture determination on the basis of oven-drying method is received using the procedure of iterative experiment planning. As a result, the factors that have the greatest influence at moisture determining by this method are determined and uncertainty of measurement is estimated.
Заболотний, Олександр Віталійович. "Розвиток теорії діелькометричної вологометрії та алгоритмічних методів підвищення точності вимірювання вмісту вологи речовин." Thesis, Національний аерокосмічний університет ім. М. Є. Жуковського "Харківський авіаційний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40893.
Full textDissertation for Doctor Degree of Technical Science (Doctor of Science) in specialty 05.11.13 “Devices and Methods of Control and Defining the Composition of Materials”. – National Aerospace University “Kharkiv Aviation Institute”, Kharkiv, 2019. The dissertation is dedicated to the problem of different materials moisture measurement accuracy increase in a way of new methods of moisture measurement development, synthesis of a new testing algorithms to calculate the quantity of moisture, conditionality examination for the solutions, received with a help of new testing algorithms, development of a new mathematical models of a static transformation characteristics, able to consider the influence of material’s type, temperature and granulometric composition of a material under research, and new initial and secondary transducers of moisture measurement development. In the dissertation we can find a comparative analysis of already developed methods of moisture measurement, provided for testing influences on the material under research. As a result, it was determined that for most of already developed testing algorithms used to calculate the result of moisture measurement the influence of “type uncertainty” is significant. To synthesize more adequate tests the function, which describes deviation of a simplified test from the universal Wiener equation, had been graphically defined with its approximation by the instruments of general type linear regression. The function of amendment had been received after approximation. Adding it to the simplified Wiener equation allowed to provide complete overlap of simplified and original Wiener formulas. The new testing algorithm, that should decrease variation between calculated and standard moisture values had been created. Really, decrease of variation had been provided, but invariance to the type of material disappeared. These attempt can not be called successful. After that a new principle of testing algorithms using least squares method and different Lagrange polynomials had been suggested. It allowed to wide the adequate range of moisture values up to 30 %, but maximal variation still has a value of 7,4 % and we don’t have effective “type uncertainty” compensation. Testing algorithm, synthesized from one additive and one multiplicative test, provided maximal deviation of 1,5 % from linear function in comparison with 3,6 % for the best analogue. To decrease variation between standard and calculated values of moisture new testing algorithm with one additive, one multiplicative and one complementary tests had been suggested. Maximal variation for it has a value of 1,16 % taking the full range of moisture measurement from 0 % to 40 %. For the first time it was done theoretical verification of the moisture values conditionality, obtained with a help of developed testing algorithms application. Mentioned above testing algorithms happened to be unusable because of low moisture values conditionality in a points 0 % and 10 % of moisture control. That’s why the new method of moisture measurement, where a testing algorithm had been constructed from two additive, two multiplicative and two complementary tests had been developed. It’s application allowed to provide conditionality of calculated moisture values at satisfactory level. A comparison analysis had been fulfilled for three best analogues and the last testing algorithm with a help of two measures of distance between calculated and nominal moisture values. It allowed to see that new method of moisture measurement provides the smallest deviation with standard moisture values and is preferable to use. During further researches a new differential method of moisture measurement for dry and liquid materials had been suggested. It provides the usage of four measuring capacitors, where two of them are filled with a probe of the material under research and the rest of capacitors should be filled with same material, but previously dehydrated. The method provides low sensitivity to the type of researched material (∆̅ Σ = 0,72%) in comparison with traditional differential method of measurement (∆̅ Σ = 1,16%). New mathematical models of a static transformation characteristics for the capacitance initial measuring transducers have been received for the first time, that allowed to fulfill the comparison analysis of thermal compensation properties for single initial transducer, classic differential transducer and a transducer, created from four measuring capacitors. After capacitance initial and secondary transducers had been developed, some number of experiments had been carried out to define the level of material’s type influence on the result of moisture measurement when using the new differential method and a method with testing algorithm, synthesized from two additive, two multiplicative and one complementary tests. Results of these experiments showed low sensitivity to the material’s type variation. Results of fulfilled theoretical and experimental researches are implemented in practice of such a firms and organizatios: limited company “VO OVEN” (Kharkiv, Ukraine); industrial enterprise “ES – Automatica” (Kharkiv, Ukraine); limited company “KODA” (Kharkiv, Ukraine); in the learning process of National Aerospace University (Kharkiv, Ukraine).
Голуб, Катерина Юріївна. "Методи і засоби підвищення точності діелькометричних вологомірів." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22689.
Full textThesis for the degree of Ph. D. in Engineering Science, specialty 05.11.13 – devices and methods of testing and determination of substances structure. – National Technical University "Kharkiv Polytechnic Institute" Ministry of Education and Science of Ukraine, Kharkiv, 2016. Thesis is devoted to accuracy increase for capacitive moisture meters by improving and developing of the methods and means allowing to reduce "uncertainty of substance type" of measurements by these moisture meters. In the thesis the test algorithms of substances moisture determination allowing to compensate "uncertainty of substance type" of measurements by capacitive moisture meters are proposed: the first test algorithm in which as test influences an additive and multiplicative tests are applied; the second test algorithm in which except additive and multiplicative tests a combined test is carried out. Comparative analysis of the received test algorithms with the best of the found analogs is carried out. Capacitive primary converter of adaptive moisture meter for bulk and liquid substances moisture measurements is developed for realization of the proposed test algorithms. The calibration methodology for primary converter on the basis of oven-drying moisture determination method is given. The mathematical model of measuring process for bulk substances moisture determination on the basis of oven-drying method is received using the procedure of iterative experiment planning. As a result, the factors that have the greatest influence at moisture determining by this method are determined and uncertainty of measurement is estimated.
Заболотний, Олександр Віталійович. "Розвиток теорії діелькометричної вологометрії та алгоритмічних методів підвищення точності вимірювання вмісту вологи речовин." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40892.
Full textDissertation for Doctor Degree of Technical Science (Doctor of Science) in specialty 05.11.13 “Devices and Methods of Control and Defining the Composition of Materials”. – National Aerospace University “Kharkiv Aviation Institute”, Kharkiv, 2019. The dissertation is dedicated to the problem of different materials moisture measurement accuracy increase in a way of new methods of moisture measurement development, synthesis of a new testing algorithms to calculate the quantity of moisture, conditionality examination for the solutions, received with a help of new testing algorithms, development of a new mathematical models of a static transformation characteristics, able to consider the influence of material’s type, temperature and granulometric composition of a material under research, and new initial and secondary transducers of moisture measurement development. In the dissertation we can find a comparative analysis of already developed methods of moisture measurement, provided for testing influences on the material under research. As a result, it was determined that for most of already developed testing algorithms used to calculate the result of moisture measurement the influence of “type uncertainty” is significant. To synthesize more adequate tests the function, which describes deviation of a simplified test from the universal Wiener equation, had been graphically defined with its approximation by the instruments of general type linear regression. The function of amendment had been received after approximation. Adding it to the simplified Wiener equation allowed to provide complete overlap of simplified and original Wiener formulas. The new testing algorithm, that should decrease variation between calculated and standard moisture values had been created. Really, decrease of variation had been provided, but invariance to the type of material disappeared. These attempt can not be called successful. After that a new principle of testing algorithms using least squares method and different Lagrange polynomials had been suggested. It allowed to wide the adequate range of moisture values up to 30 %, but maximal variation still has a value of 7,4 % and we don’t have effective “type uncertainty” compensation. Testing algorithm, synthesized from one additive and one multiplicative test, provided maximal deviation of 1,5 % from linear function in comparison with 3,6 % for the best analogue. To decrease variation between standard and calculated values of moisture new testing algorithm with one additive, one multiplicative and one complementary tests had been suggested. Maximal variation for it has a value of 1,16 % taking the full range of moisture measurement from 0 % to 40 %. For the first time it was done theoretical verification of the moisture values conditionality, obtained with a help of developed testing algorithms application. Mentioned above testing algorithms happened to be unusable because of low moisture values conditionality in a points 0 % and 10 % of moisture control. That’s why the new method of moisture measurement, where a testing algorithm had been constructed from two additive, two multiplicative and two complementary tests had been developed. It’s application allowed to provide conditionality of calculated moisture values at satisfactory level. A comparison analysis had been fulfilled for three best analogues and the last testing algorithm with a help of two measures of distance between calculated and nominal moisture values. It allowed to see that new method of moisture measurement provides the smallest deviation with standard moisture values and is preferable to use. During further researches a new differential method of moisture measurement for dry and liquid materials had been suggested. It provides the usage of four measuring capacitors, where two of them are filled with a probe of the material under research and the rest of capacitors should be filled with same material, but previously dehydrated. The method provides low sensitivity to the type of researched material (∆̅ Σ = 0,72%) in comparison with traditional differential method of measurement (∆̅ Σ = 1,16%). New mathematical models of a static transformation characteristics for the capacitance initial measuring transducers have been received for the first time, that allowed to fulfill the comparison analysis of thermal compensation properties for single initial transducer, classic differential transducer and a transducer, created from four measuring capacitors. After capacitance initial and secondary transducers had been developed, some number of experiments had been carried out to define the level of material’s type influence on the result of moisture measurement when using the new differential method and a method with testing algorithm, synthesized from two additive, two multiplicative and one complementary tests. Results of these experiments showed low sensitivity to the material’s type variation. Results of fulfilled theoretical and experimental researches are implemented in practice of such a firms and organizatios: limited company “VO OVEN” (Kharkiv, Ukraine); industrial enterprise “ES – Automatica” (Kharkiv, Ukraine); limited company “KODA” (Kharkiv, Ukraine); in the learning process of National Aerospace University (Kharkiv, Ukraine).