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Academic literature on the topic 'Коефіцієнт перевищення'
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Journal articles on the topic "Коефіцієнт перевищення"
Бугайов, Микола Вікторович, Олександр Анатолійович Нагорнюк, and Роман Вікторович Шапар. "Огляд аналізаторів радіочастотного спектра та пропозиції щодо динамічної реалізації енергетичного детектора." Технічна інженерія, no. 2(88) (November 30, 2021): 95–102. http://dx.doi.org/10.26642/ten-2021-2(88)-95-102.
Full textВишняков, Володимир Михайлович, and Мхамад Ібрагім Ахмад Альомар. "Збільшення корисного завантаження вузлового обладнання комп’ютерних мереж." New computer technology 11 (November 22, 2013): 159–60. http://dx.doi.org/10.55056/nocote.v11i1.164.
Full textГЛУХОВСЬКИЙ, В. П., М. Г. МАР’ЄНКОВ, and С. М. САМОЙЛЕНКО. "ОЦІНКА МІЦНОСТІ МОНОЛІТНОГО БЕТОНУ В КОНСТРУКЦІЯХ ЗА РЕЗУЛЬТАТАМИ УЛЬТРАЗВУКОВИХ ВИПРОБУВАНЬ." Наука та будівництво 18, no. 4 (May 9, 2019): 69–73. http://dx.doi.org/10.33644/scienceandconstruction.v18i4.60.
Full textRubtsov, Ihor. "ПОРІВНЯЛЬНА ОЦІНКА ТЕЛИЦЬ УКРАЇНСЬКОЇ ЧОРНО-РЯБОЇ ТА ЧЕРВОНО-РЯБОЇ МОЛОЧНИХ ПОРІД ЗА РОСТОМ, ПРОМІРАМИ ТА ПРИРОСТАМИ ЖИВОЇ МАСИ НА ЧЕРНІГІВЩИНІ." Bulletin of Sumy National Agrarian University. The series: Livestock, no. 1(44) (March 29, 2021): 80–85. http://dx.doi.org/10.32845/bsnau.lvst.2021.1.11.
Full textZhuk, V. M., M. S. Malovanyy, I. V. Mysak, I. S. Tymchuk, Dirk Muschalla, and Marcus Pichler. "Часова та просторова нерівномірність випадання дощів при моделюванні поверхневого стоку з урбанізованих територій." Scientific Bulletin of UNFU 31, no. 5 (November 25, 2021): 67–73. http://dx.doi.org/10.36930/40310510.
Full textЗдещиц, В., and А. Здещиц. "ВИЗНАЧЕННЯ ВЕЛИЧИНИ КОЕФІЦІЄНТА ВІДНОВЛЕННЯ ПРИ ЗІТКНЕННІ ТІЛ: ПЕРЕВІРКА ГІПОТЕЗИ НЬЮТОНА." Physical and Mathematical Education 27, no. 1 (April 26, 2021): 50–56. http://dx.doi.org/10.31110/2413-1571-2021-027-1-008.
Full textПІВТОРАК, Галина, Віктор ГОЛОМОВЗИЙ, and Мар’яна ЖИЛА. "ОЦІНКА ВПЛИВУ ЗМІНИ ПАРАМЕТРІВ ФУНКЦІЇ ПЕРЕВАГИ НА РОЗПОДІЛ ПОПИТУ НА ПЕРЕМІЩЕННЯ МІЖ ТРАНСПОРТНИМИ РАЙОНАМИ МІСТА." СУЧАСНІ ТЕХНОЛОГІЇ В МАШИНОБУДУВАННІ ТА ТРАНСПОРТІ 2, no. 15 (November 27, 2020): 118–26. http://dx.doi.org/10.36910/automash.v2i15.399.
Full textВАЛЕРКО, Руслана, and Людмила ГЕРАСИМЧУК. "ЕКОЛОГІЧНА ОЦІНКА СТАНУ ПІДЗЕМНИХ ВОД БЕРДИЧІВСЬКОГО РАЙОНУ ЖИТОМИРСЬКОЇ ОБЛАСТІ." Проблеми хімії та сталого розвитку, no. 4 (January 19, 2022): 11–16. http://dx.doi.org/10.32782/pcsd-2021-4-2.
Full textФурдига, М. М. "Адаптивна здатність та потенційні властивості сортів картоплі селекції Інституту картоплярства НААН." Аграрні інновації, no. 12 (May 23, 2022): 103–9. http://dx.doi.org/10.32848/agrar.innov.2022.12.16.
Full textЛИТВИН, Вадим, and Ігор ТАРАН. "КІЛЬКІСНА ОЦІНКА ВПЛИВУ ОБЛАШТУВАННЯ ПАРКУВАЛЬНИХ МІСЦЬ У КРАЙНІЙ ПРАВІЙ СМУЗІ НА ЕФЕКТИВНІСТЬ ДОРОЖНЬОГО РУХУ." СУЧАСНІ ТЕХНОЛОГІЇ В МАШИНОБУДУВАННІ ТА ТРАНСПОРТІ 2, no. 15 (November 26, 2020): 41–53. http://dx.doi.org/10.36910/automash.v2i15.391.
Full textDissertations / Theses on the topic "Коефіцієнт перевищення"
Гапон, Дмитро Анатолійович. "Методи та засоби аналізу якості електропостачання та електромагнітної сумісності електротехнічних комплексів та систем." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48421.
Full textThe dissertation on competition of a scientific degree of the doctor of technical sciences on a specialty 05.09.03 - "Electrotechnical complexes and systems". - National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. In the dissertation the important scientific and technical problem of increase of quality of power supply of electrotechnical objects, complexes and systems and maintenance of their electromagnetic compatibility by development of mathematical and hardware of systems of the account of the electric power taking into account energy efficiency of modes of power consumption and the revealed infringements of electromagnetic compatibility energy or its consumer. In the introduction the existing problem is defined and the urgency of the dissertation topic is substantiated, the connection of work with scientific programs, plans, themes is given, the purpose and tasks of scientific research are formulated, the object and subject of researches are considered, the list of research methods applied for achievement of the set purpose is given work. The scientific no velty and practical significance of the obtained results are stated, the data on publications and approbation of the results of the work are given, the personal contribution of the applicant is characterized, the information on the implementation of the results of the work is given. In the first section, based on the study and systematization of the results of analysis of materials from open sources, the main shortcomings of existing methods of assessing the quality of electricity supply and regulatory framework, which does not fully resolve conflict situations in violation of electromagnetic compatibility in terms of electricity supplier - consumer. Methods for determining the responsibility for the deterioration of electricity quality and its individual indicators are also considered. The second section analyzes the typical power supply scheme, which allowed to draw conclusions and obtain the main numerical characteristics of the power supply system of a three-phase electrical facility with a supply voltage of 10 kV. The computer model shows the mutual influence of several consumers on the quality indicators of the voltage at the point of connection and analyzes the influence of the parameters of the power supply system, these indicators. It is shown that the definition of the source of higher harmonics in the direction of the component power of the higher harmonic does not guarantee to allocate a consumer with a nonlinear load if the number of such consumers is greater than one. The compatibility of EN 50160 and IEEE 519 standards in terms of the norm of levels of harmonic components in the composition of current and voltage is also analyzed. The obtained results allow to speak about the presence of certain moments in which the higher harmonic components of the current generated by the consumer without violating the IEEE 519 standard can cause the presence of voltage harmonics exceeding the norms set by EN 50160. It is also concluded that the generation of higher harmonic components system resistance values. The third section proposes further development of the mathematical apparatus for determining power and loss coefficients as indicators of power consumption quality, in particular, the determination of integrated loss coefficients for three-phase three-wire and four-wire networks is substantiated. The theory of the "reference" consumer was further developed. It is shown that in a three-phase three-wire network the reference consumer, regardless of the voltage parameters, is a symmetrical triangle of constant active resistances. It is shown that in a three-phase four-wire system the reference consumer, regardless of voltage parameters, is a combination of a symmetric triangle of constant active resistances and a symmetric star, the resistance in the branches of which is as many times the resistance of the triangle as the active resistance of the neutral conductor. For the first time, a mathematical apparatus for selecting individual components from the total power and loss coefficients for such types of distortions as asymmetry, nonlinearity, reactivity and nonstationarity has been proposed. The concept of the reference reactive consumer from the conditions of maximum power or minimum losses at equality of ratios of power flows from and to the consumer is offered, that allows to realize calculation of coefficient of reactivity and power at any form of voltage in single-phase and three-phase networks. It is shown that in such a statement the reference reactive consumer tends to generate higher harmonics and does not have a convenient analytical or numerical solution for comparison with the current consumer. The concept of the average reactive consumer is proposed, in which all harmonics have an equal ratio of power flows to and from the consumer, which allows to compare the current consumption mode of the current consumer with such an average reactive one. A method for estimating the coefficients of loss and power from asymmetry for a three-phase consumer at arbitrary voltage is proposed. A method for estimating the ratio of the coefficients of losses from reactivity and nonlinearity of the consumer by dividing the corresponding harmonics of the Frieze current in the direction of the active component is proposed. A method for estimating the coefficients of losses and power from non-stationary consumption is proposed. In the fourth section the analysis of character of complex resistance of an electric network depending on parameters of its elements for typical cases of connection of consumers on voltage of 10 KV is carried out. The obtained dependence allows us to talk about the possible use of normalized values to estimate network bandwidth. The method of measuring the electrical parameters of a three-phase network based on the approximation of the input signal by the sum of harmonic components has been further developed. Features of the method are automatic adjustment of the frequency and duration of the observation interval in a given range, the use of a complete set of phase voltages (or linear) in determining the frequency taking into account their weight values, which reduces measurement errors in difficult conditions - in the presence of asymmetry, higher harmonics, aperiodic component or in the absence of voltage in a separate phase. In addition, the measurement method uses a constant quantization frequency of the input digital data, which simplifies the hardware of the device. A method of calculating the current values with a precise reference to the voltage period obtained by the previous method is proposed, which eliminates the frequency error in the measurement regardless of the location of the beginning and end of the observation interval relative to the input digital signal. The system of the account of electric energy with use of indicators of quality of electric energy and efficiency of electric consumption is offered. A feature of the system is the additional accounting of losses for the transmission of electricity by comparing the characteristics of electricity consumption of the current consumer with those for the reference consumer, ie the use of loss factors or power. This method of accounting allows you to correctly rate all deviations in the modes of load, such as reactivity, nonlinearity and nonstationarity. A system of penalties for deterioration of electricity quality is proposed, based on the calculation of "penalty" energy if the consumer violates the norms of electricity consumption and "non-tariffed" energy, if there are no violations by the consumer, but the quality of electricity does not meet the norms. The basics of billing on the basis of this electricity metering system are proposed. In the fifth section, the data confirming the theoretical provisions of sections 3 and 4 were experimentally obtained. In particular, estimates of the quality of electricity consumption were implemented by comparison with a set of reference consumers. The experiment showed the possibility of successful application of Frieze current generation and its subsequent analysis to assess the quality of electricity consumption. At the same time parallel use of its three-phase and single-phase implementations for an estimation of asymmetry, nonlinearity and reactivity accordingly is possible. The method of comparison with the reference average reactive consumer proposed in section 3 has not proved to be an effective tool of analysis and does not seem promising. At the same time, the separation of the harmonic components of the Frieze current in the direction of their active component allows you to effectively track the source of currents of higher harmonics. The above methods using the model of a fragment of the power system with different types of load confirmed the correctness of the developed methods for assessing the quality of electricity consumption. Tests using oscillograms obtained on real three-phase loads (traction substation) also confirmed the efficiency and effectiveness of the developed assessment methods. In models with exceeding the permissible modes, the use of the mathematical apparatus developed in Section 4 allowed to identify the source of distortion, even if several consumers act as sources of these distortions at the same time.