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Academic literature on the topic 'Акустичний імпульс'
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Journal articles on the topic "Акустичний імпульс"
Моркун, В. С., Н. В. Моркун, В. В. Тронь, О. Ю. Сердюк, І. А. Гапоненко, and А. А. Гапоненко. "Попереднє оброблення пульпи ультразвуком для очищення рудних зерен та дезінтеграції флокулоутворень на основі ефектів кавітації." ВІСНИК СХІДНОУКРАЇНСЬКОГО НАЦІОНАЛЬНОГО УНІВЕРСИТЕТУ імені Володимира Даля, no. 1(271) (February 8, 2022): 24–35. http://dx.doi.org/10.33216/1998-7927-2022-271-1-24-35.
Full textOksen, Y. І. "Досвід застосування віброакустичного аналізу при випробуваннях залізобетонного мосту через річку Дністер в с. Заліски." Наука та будівництво 22, no. 4 (December 24, 2019): 11–20. http://dx.doi.org/10.33644/scienceandconstruction.v22i4.115.
Full textDissertations / Theses on the topic "Акустичний імпульс"
Гурин, Анатолій Григорович, and А. Г. Ведмідь. "Конструкція грузонесучого геофізичного кабелю з оптоволоконною лінією передачі сигналів управління акустичними випромінювачами." Thesis, НТУ "ХПІ", 2013. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21509.
Full textГурин, Анатолій Григорович, Сергій Петрович Мостовий, В. В. Підашов, and Ольга Миколаївна Ярмак. "Застосування електродинамічних випромінювачів у технології пошуку та інтенсифікації видобутку нафти." Thesis, НТУ "ХПІ", 2011. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21490.
Full textГурин, Анатолій Григорович, and Є. С. Москвітін. "Визначення демпфуючих властивостей електроізоляційних матеріалів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48719.
Full textСалам, Буссі. "Електромагнітно-акустичні перетворювачі для ультразвукового контролю металовиробів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48184.
Full textThesis for a Candidate Degree in Engineering (Doctor of Philosophy), specialty 05.11.13 "Devices and methods of testing and determination of composition of substances" - National Technical University "Kharkiv Polytechnic Institute". The dissertation is devoted to development of new ultrasonic electromagnetic-acoustic transducers with a source of pulsed polarizing magnetic field, methods of sensitive testing and diagnostics of metalware with the use of transducers of this type. Analytical review and analysis of modern means and methods of testing and diagnostics via electromagnetic-acoustic method [1-3] of ferromagnetic and electrically conductive or strictly electrically conductive products under conditions of impact of constant and pulse polarizing magnetic fields taking into account the presence of coherent interferences of different types, technical level of modern electromagnetic circuits, means of their power supply, reception of ultrasonic pulses from metalware and their processing, determination of known advantages and disadvantages, and opportunities of their use in research and development. The direction of the research is defined and justified: development of electromagnetic-acoustic transducer in the form of a simplified single-wind coil model [4] of a source of a magnetic polarizing field with a ferromagnetic core and a high-frequency coil, which is located between the core and the sample; by modeling [5] the distribution of induction of polarizing magnetic field at the end face of the core of the magnetic field source and in the surface layer of both ferromagnetic and non-ferromagnetic metallurgy the features of the location of the high frequency coil of inductance under the magnetic field source are effectively determined for the effective excitation of shear ultrasonic pulses (near the peripheral end of the ferromagnetic core) [6]. The increase in number of winds of magnetization coil in presence of a ferromagnetic core leads to a significant increase in time of transients during the process of powering of a pulsed source of a polarizing magnetic field and during its switching off. As a result, the duration of the power pulse increases to 1 ms or more, which leads to an increase in the force of attraction of EMAP to the ferromagnetic product, additional losses of electricity, deterioration of temperature conditions of the transducer. To reduce the duration of powering pulse of magnetic field it is necessary to reduce the number of winds of the magnetizing coil, but this leads to a decrease in magnetic induction magnitude, even in presence of a ferromagnetic core. As a result of rational choice of the design of the magnetic field source, the flat coil of magnetization must be made with a two-window three-wind and made of high-conductive high-heat-conducting material [7-9]. The core should be placed in the windows of the magnet coil only by the ends. As a result, the action time of the magnetization pulse is reduced to 200 μs, which is sufficient for testing of samples up to 300 mm thick. The high-frequency inductor coil is made of two linear working sections that are located under the windows of the coil [9]. In opposite directions of high-frequency current in these working areas, in-phase powerful pulses of shear ultrasonic waves are excited in the surface layer of the product. The ratio of the excited amplitudes of the shear and longitudinal pulses exceeds 30 dB. That is, the coherent pulses of longitudinal waves in the testing of the moon by the method will practically not affect the results of the diagnosis of ferromagnetic products. Design variants of electromagnetic-acoustic transducers with one-wind [7], two-wind [8] and three-wind magnetization coils [9] of a source of a pulsed polarizing magnetic field are developed. With a single-coil [7], the transients are minimal when the power pulse is winded on. However, it is necessary to excite in the coil a current of several kA, which complicates the temperature conditions of the transducer and power equipment. With a three-coil [9] magnetization, the amplitude of the bottom pulses in relation to the amplitude of the interference exceeds 24 dB, which allows for testing and diagnostics of large variety of samples. When using the charge core [9], the ratio of amplitudes increased to 38 dB, which makes it possible to monitor the echo by the method. The method [10] of ultrasonic electromagnetic - acoustic testing of ferromagnetic products is developed. vectors of intensity with duration of several periods of high filling frequency, n and this excitation of the pulses of the electromagnetic field is performed at a time equal to the time of transients to establish the operating value of the induction of the polarizing magnetic field, and the reception of ultrasonic pulses reflected from the product is performed in the time period tпр, which is determined by the expression T – t1 – t2 – t3 < tпр = t1 + t2 + t3 + 2H/C, where T is the duration of the magnetization pulse; t1 is the time of transients to establish the working value of the induction of a polarizing magnetic field; t2 - time of packet pulse of electromagnetic field; t3 is the time of damping oscillations in the flat high frequency inductor; H is the thickness of the product or the distance in volume of the product to be ultrasound; C is the velocity of propagation of shear ultrasonic waves in the material of the product. It is established [9] that the interferences in the ferromagnetic core caused by the Barkhausen effect and magnetostrictive transformation of electromagnetic energy into ultrasound are practically excluded by production of the core blended, usage of the material of the core plates which has a low coefficient of magnetostrictive conversion, perpendicular core plates orientation in relation to the conductors of the working areas of the flat high-frequency inductor, as well as filling of the gaps between the plates with a high density fluid, such as glycerol. It is shown that the sensitivity of direct EMA transducers with pulse magnetization when powered by a batch high frequency probe pulse generator [11] and when receiving via a low noise amplifier [12] provide detection of flat-bottomed reflectors with a diameter of 3 mm or more, probe frequency of 40 Hz, peak high-frequency current of 120A, shear linearly polarized ultrasonic oscillations of 2.3 MHz, high frequency packet pulse duration 6…7 filling frequency periods, magnetization pulse duration 200 μs, magnetization current density of 600 A / mm2 and at the gap between the EMAP and the product of 0.2 mm [9]. The amplitude of the echo momentum reflected from the flaw in relation to the noise amplitude reaches 20 dB. The EMATs developed are protected with 2 utility model patents.
Салам, Буссі. "Електромагнітно-акустичні перетворювачі для ультразвукового контролю металовиробів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48181.
Full textThesis for a Candidate Degree in Engineering, specialty 05.11.13 – Devices and methods of testing and determination of composition of substances. National Technical University “Kharkiv Polytechnic Institute”, Kharkiv, 2020. A relevant scientific – practical problem on development of new types of EMAP for effective ultrasonic control of metal products is solved in the dissertation. Computer simulation of EMAT magnetic fields distribution in pulse magnetization of ferromagnetic and non-magnetic products is performed. Ways to build transducers with maximum sensitivity are established. The method of excitation of pulsed batch ultrasonic pulses due to the sequential formation of pulsed magnetic and electromagnetic fields is developed. Technical solutions for suppression of coherent interference in the core and in the product have been developed. The geometrical and structural parameters of pulsed magnetic field source were determined, which made it possible to excite powerful in-phase packet pulses of high-frequency shear oscillations in a sample. It is shown that the sensitivity of direct EMA transducers with pulse magnetization provide detection of flat-bottom reflectors with a diameter of 3 mm and more at a probing frequency of 40 Hz, a frequency of shear linearly polarized ultrasonic oscillations of 2.3 MHz, a peak current of high-frequency packet pulses of 120 A, duration of batch high frequency current pulses in 6 periods of filling frequency, magnetization pulse duration of 200 μs, magnetization current of 600 A and at the gap between EMAP and product of 0.2 mm.
Гурин, Анатолій Григорович, Г. В. Євменова, Р. І. Кащавцев, and Ольга Миколаївна Ярмак. "Розповсюдження ударного імпульсу у навколишньому середовищі колектора нафтової свердловини при електрогідравлічному розряді." Thesis, НТУ "ХПІ", 2010. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21487.
Full textГутак, О. І. "Удосконалення технології інтенсифікації видобутку вуглеводнів шляхом різночастотного імпульсно-хвильового впливу на нафтогазонасичені породи." Thesis, Івано-Франківський національний технічний університет нафти і газу, 2013. http://elar.nung.edu.ua/handle/123456789/4449.
Full textДиссертация посвящена проблеме усовершенствования технологии интенсификации добычи углеводородов импульсно-волновыми методами воздействия на нефтегазонасыщенные породы. В работе проведено исследование механизма распространения акустических волн различных частот в насыщенных средах, характерных для месторождений нефти и газа. Получено уравнение разночастотной суперпозиции цилиндрических упругих волн, описано явление образования разностной низкочастотной волны биения и проведена оценка их влияния на продуктивный пласт в зависимости от частот и расстояния между излучателями. Экспериментально подтверждено образование низкочастотной волны вследствие взаимодействия высокочастотных волн диапазона 50 Гц - 20 кГц с разницей в частоте до 5% в условиях насыпной насыщенной модели пласта. Акустические сигналы получали одновременно двумя способами с помощью геофона и сейсмодатчика типа СВ 5 по двухканальной линии и регистрировали на персональном компьютере программой SpectraPLUS. Проведена оценка градиента давления при волновом воздействии, который возникает в призабойной зоне пласта в процессе фильтрации флюида. Нефти многих месторождений характеризуются повышенным содержанием высокомолекулярных парафиновых углеводородов, которые с изменением термобарических условий кристаллизируются в твердую фазу, в результате чего образуются сложные коллоидно-дисперсные системы, которые приобретают вязкопластические свойства. Установлено, что одновременное действие гидродинамического градиента давления и акустического градиента давления, приводит к преодолению предельного напряжения сдвига коллоидно-дисперсных систем, причём, при длительном волновом воздействии частично разрушается их структура и снижается предельное напряжение сдвига. Исследовано характер изменения мениска на границе двух фаз вследствие воздействия упругих колебаний, проведено теоретическую оценку их влияния на динамическое изменение капиллярного давления. Установлено, что влияние упругими колебаниями интенсивностью 0,01 Вт/см2 при фильтрации нефтеводяной смеси в насыпной модели пласта приводит к увеличению фазовой проницаемости для нефти вязкостью 50 мПа•с на 25 %, а после полного обводнения продукции, действие такими колебаниями приводит к дополнительному извлечению остаточной нефти на 5-11%. Теоретическими и экспериментальными исследованиями установлено, что периодическое увеличение и уменьшение давления в пласте, которое возникает вследствие воздействия упругими колебаниями, приводит к дополнительному разгазированию нефти, в том числе при условии полного выделения газа при текущем пластовом давлении. Установлено, что влияние упругими колебаниями на процесс движения жидкости в капилляре приводит к увеличению скорости движения, что даёт основания предполагать аналогичный эффект в пористой среде. Получено зависимости между расходом жидкости через капилляр диаметром 4 мм и частотой упругих колебаний диапазона 22-45 Гц на стенки капилляра для воды и водных растворов КМЦ с вязкостью от 1 до 10 мПа•с. Разработаны технологии разночастотного импульсно-волнового воздействия на нефтегазонасыщенные породы с использованием устройств с несколькими излучателями, в том числе разночастотными, которые позволят дифференцированно обрабатывать ближнюю и отдаленную зоны пласта, достигая при этом дополнительного разгазирования и увеличение фазовой проницаемости для нефти в условиях обводнения пласта. Промышленные испытания разработанных технологий подтвердили их эффективность и перспективность широкого внедрения в нефтегазодобывающих скважинах.
The thesis is devoted to the problem of improvement enhanced hydrocarbons recovery technology using the pulse-wave treatments in the oil and gas saturated rocks. Evaluation study of the different frequencies acoustic waves propagation mechanism in saturated environments typical for oil and gas was presented in the paper. The equation of different frequency interference of cylindrical elastic waves in the reservoir and an assessment of their impact was obtained. The phenomenon of the difference low-frequency waves beating formation and assessed their impact on the productive layer, depending on the frequency and distance between the emitters, was described. The formation of low-frequency waves by the interaction of high-frequency waves in the range of 50 Hz - 20 kHz with a difference in the frequency of 5% in sand packed saturated model was experimentally confirmed. The variation of the meniscus on the two phase border due to the impact of elastic vibrations was investigated. Was determined the effect of elastic vibration treatment with intensity 0.01 W/cm2 at filtering oil-and-water mixture in the sand packed model leads to increasing oil relative permeability at 25% for oil with viscosity of 50 mPa•s, and in case of full watering leads to additional remaining oil recovery at 5-11%. Theoretical and experimental evaluations shows that as a result of elastic vibration treatment the effect of repetitive pressure increasing and decreasing leads to the additional oil degasification, including completely degassing at the current reservoir pressure. Effect of the elastic vibration treatment to the fluid flow process in the capillary leads to the velocity increasing was experimentally founded. It allows suggesting that similar effects take place in porous media. The different frequencies pulse wave treatment technology on oil and gas saturated rocks using devices with several emitters, including different frequencies emitters, that will differentially handle near and remote well bore zone, which allows achieving additional degasification and oii relative permeability increasing in case of watering. Industrial tests of the developed technologies proved their effectiveness and promising wide introduction into the oil and gas wells.
Таратута, Владислав Олександрович. "Дослідження шляхів імпульсно–акустичного впливу на швидкості горіння природного газу." Магістерська робота, 2021. https://dspace.znu.edu.ua/jspui/handle/12345/5314.
Full textUA : Робота викладена на 99 сторінках друкованого тексту, містить 22 таблиці, 7 рисунків. Перелік посилань включає 51 джерел з них на іноземній мові 15. Було розглянуто приклади інтенсифікації процесів теплообміну за допомогою ультразвуку. Було проведено експеримент по опроміненню трансформаторного масла, в яке була занурена розігріта пластина. На основі отриманих даних було розраховано темп охолодження і коефіцієнт тепловіддачі, параметри ультразвукової кавітації.
EN : The work is presented on 99 pages of printed text, contains 22 tables, 7 figures.The list of references includes 51 sources,15 of them in foreign language. Examples of intensification of heat transfer processes with the help of ultrasound were considered. An experiment was performed on the irradiation of transformer oil, in which a heated plate was immersed. Based on the obtained data, the cooling rate and heat transfer coefficient, ultrasonic cavitation parameters were calculated.