Кафедра "Загальна електротехніка"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/2838

Офіційний сайт кафедри http://web.kpi.kharkov.ua/ze

Кафедра "Загальна електротехніка" заснована в 1931 році на базі електротехнічного факультету.

Курс електротехніки як самостійної дисципліни першим почав читати Клобуков Микола Петрович ще в 1892 році. Першим завідувачем кафедри був професор Копняєв Павло Петрович.

Кафедра входить до складу Навчально-наукового інституту енергетики, електроніки та електромеханіки Національного технічного університету "Харківський політехнічний інститут" .

У складі науково-педагогічного колективу кафедри працюють: 2 доктора технічних наук, 5 кандидатів технічних наук; 2 співробітника мають звання професора, 3 – доцента.

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2016 - 201912020 - 20212

Налаштування

Автор: search.filters.author.Omelchenko, A.

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  • Ескіз
    Документ
    Reduction of auto seismic oscillations of the ballistic laser gravimeter on account of the excitation of the induction-dynamic catapult by a pulse packet
    (Національний науковий центр "Інститут метрології", 2020) Bolyukh, V.; Vinnichenko, O.; Neyezhmakov, P.; Omelchenko, A.
    In order to reduce auto seismic oscillations in the ballistic laser gravimeters (BLG) with a symmetric method of mea suring the gravitational acceleration (GA), an induction-dynamic catapult (IDC) is used, which is excited by a pulse packet from a capacitive energy storage unit (CES). With such excitation, a decrease in the amplitude of auto seismic oscillations is achieved by reducing the amplitude and increasing the duration of action of the electrodynamic force that occurs in the IDC when pushing the test body (TB). A mathematical model of the IDC of the ballistic laser gravimeter with a symmetric method of measuring the GA is developed and the modeling of its electromechanical characteristics is carried out. Various methods of generating a packet of excitation pulses of the IDC inductor are considered and the characteristics of electrodynamic force pulses that accelerate the armature of the catapult with TB are investigated for them. The effect of IDC excitation by a pulse packet on the auto seismic component of the GA measurement is investigated. It is shown that on account of the excitation of the IDC by a ten-pulse packet, the auto seismic component of the uncertainty of the GA measurement by ballistic gravimeters can be reduced several (3–5) times in comparison with the excitation of the catapult by a single pulse.
  • Ескіз
    Документ
    Reduction of the auto seismic component of error of a ballistic laser gravimeter by excitation of an inductiondynamic catapult from an AC voltage source
    (Національний науковий центр "Інститут метрології", 2021) Bolyukh, V. F.; Vinnichenko, A. I.; Omelchenko, A.
    The purpose of the study is to analyse the influence of the excitation of an induction-dynamic catapult of a ballistic laser gravimeter from an AC voltage source at different frequencies on electromechanical indicators that provide a reduced value of the auto seismic component of error in measuring the gravitational acceleration g due to a decrease in the recoil force. A mathematical model of the gravimeter catapult when excited from an AC voltage source is proposed, taking into account the interrelated electrical, magnetic and mechanical processes. The nature of the electromechanical processes in the catapult of the gravimeter with such excitation has been established. It is shown that a phase shift occurs between the currents in active elements, as a result of which positive (repulsive) pulses of the electrodynamic force alternate with negative (attractive) pulses of force. A criterion for the efficiency of the gravimeter catapult has been introduced, taking into account the maximum value of push of the test body at the smallest values of the electrodynamic force and current of the inductor winding. It was found that the highest efficiency of the gravimeter catapult is provided at a frequency of 250 Hz, at which the catapult efficiency is 3.5 times higher than at a frequency of 50 Hz. It is shown that the transition from the method of excitation of an induction-dynamic catapult with one short pulse to excitation from an AC voltage source makes it possible to reduce the uncertainty in measuring the gravitational acceleration.
  • Ескіз
    Документ
    A ballistic laser gravimeter for a symmetrical measurement method with the inductive-dynamic catapult and auto-seismic vibration preventing
    (State Research Center of the Russian Federation, 2016) Bolyukh, V. F.; Omelchenko, A.; Vinnichenko, A. I.
    A ballistic laser gravimeter (BLG) with a symmetrical measurement method of the gravity acceleration (GA) is considered. Special treatment is given to the problem of eliminating the measurement error due throw of the catapult when it speeds up the test body (TB). It is possible to decrease the indicated errors thanks to the use of the induction and dynamic catapult. However, a short-term boost catapult generates vibrations of the basement (i.e. a pillar) and the mechanical elements of the gravimeter, what causes auto-seismic (i.e. recoil-related) component of the measurement error. To reduce them it is proposed to launch the TB with the help of a massive platform, installed on a light spring. It is shown, that the considered BLG can provide auto-seismic component of the measurement error of less than 1 μGal. With the reduction of the light spring constant the auto-seismic component of GA measurement uncertainty is reduced. The value of this measurement error can be reduced by the use of damping in the system of BG protection from auto-seismic fluctuations. A concept of BLG with induction-dynamic catapult for symmetric method of gravitational acceleration measuring is presented. The concept is based on using electromagnetic compensator of stiffness.