Journal articles: 'Pumping mode'

1

Anis, Wagdy R., and M. Abdul-Sadek Nour. "Switching mode photovoltaic pumping system." Energy Conversion and Management 35, no. 9 (September 1994): 765–73. http://dx.doi.org/10.1016/0196-8904(94)90105-8.

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2

Kharun, V. R., V. М. Senchishak, V. Ya Popovych, and І. І. Shostakivskyi. "The research beam pumping unit of start-up mode." Oil and Gas Power Engineering, no. 1(35) (June 29, 2021): 48–59. http://dx.doi.org/10.31471/1993-9868-2021-1(35)-48-59.

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In the article, research of the beam-pumping unit start-up mode has been performed in accordance with the existing configurations of the rod column, the diameter of the plunger and the dynamic fluid level in the well. A mathematical model of the pumping unit actuator has been developed, it takes into account the mechanical characteristics of the drive motor, the moments of inertia of the belt drive and gears of the gearbox and the mass of the actuator components. Calculations have been performed for the variant of the pump rod column layout - two-stage, for the diameters of the plunger 55mm and depths of pump suspension of 1456 m. The problem of the beam-pumping units’ startup is defined for two cases. The first case is applied when the mass of the counterweights installed on the cranks of the pumping unit exceeds the mass of the column of rods and liquid, which is located in the tubing column above the plunger of the pump (rebalance of the beam pumping unit). The second - when the mass of counterweights is insufficient to balance the column of rods and the liquid in the tubing column above the pump plunger (imbalance of the beam pumping unit). The cases of rebalancing and imbalancing of the pumping unit occur in wells that are under periodic operative conditions. The first case - rebalancing occurs when the oil rocking pumping unit does not work, and the liquid level behind the tubing gradually increases up to its static level. After switching on the drive motor, the torque created by the crank counterweights exceeds the moment caused by means of the weight of the rod column and the liquid in the tubing column. Therefore, it is recommended to start the pumping unit from the lowest position of the rod suspender. In the second case, the imbalance occurs when the liquid’s dynamic level behind the tubing is lowered before receiving the submersible pump. Then the torque, created by the crank counterweights is insufficient to compensate the moment, caused by means of weight of the rods’ column and the liquid in the tubing column. Therefore, it is recommended to start the beam pumping unit from the top position of the rod suspension. As a result of calculations, the conditions of overload occurrence in wells with periodic operative conditions of the pumping unit are determined

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3

Margo, B. D., and J. Seyed-Yagoobi. "Heat Transfer Enhancement Under Various Orientations Resulting From Attraction Mode Induction Electrohydrodynamic Pumping." Journal of Heat Transfer 116, no. 3 (August 1, 1994): 598–603. http://dx.doi.org/10.1115/1.2910911.

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An induction electrohydrodynamic (EHD) pump in an axisymmetric configuration was designed and built to examine the heat transfer enhancement that accompanies fluid pumping. The apparatus was operated at several tilt angles between 0 (horizontal) and 90 while the augmentation of heat transfer was measured and compared to typical forced pumping and natural circulation. The increase in the overall conductance value for EHD pumping compared to typical forced pumping under turbulent flow conditions was as high as 71 percent. This corresponds to a much higher increase in the inside convection coefficient, which is the only resistance to heat transfer being affected by induction pumping.

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4

Xiao, Ye, and Xiao Tang Ding. "Analysis and Research on Dynamic Characteristics of Bulb Tubular Pumping Station Structure." Advanced Materials Research 594-597 (November 2012): 1917–21. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.1917.

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This paper was combined with the third Huaian pumping station to study the dynamic characteristics of the bulb tubular pumping station. By using dynamic finite element analysis method to create Huaian pumping station modes. Then using ANSYS Model Analysis and harmonic response analysis, the vibration modes and dynamic response were researched deeply. According to the mode analysis results, the fundamental frequencies of upper pump house were determined for 1.36Hz and the fundamental frequencies of substructure were determined for 20.11Hz. The dynamic response of the bulb tubular pumping station structure under fluctuating pressures is calculated by ANSYS harmonic response analysis, and the results show that dynamic displacement satisfied the maximum allowable of architectural construction permission，so it can satisfy design requirement, which provides references value for other tubular pumping station in anti-vibration design.

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5

Abidov, Kudrat, and Odiljon Zaripov. "Self-starting of pump units when extinguishing voltage in the energy saving mode." E3S Web of Conferences 139 (2019): 01088. http://dx.doi.org/10.1051/e3sconf/201913901088.

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The article discusses the main processes that occur during the self-start of pumping units of pumping stations of systems of machine lifting for irrigation, ensuring the rational use of electricity, pumping equipment and irrigation water.

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6

Zhang, Canran, Gangyi Zhu, Siqing He, and Jun Dai. "Side-mode suppression in ultraviolet quasi-semicircle microlaser cavity." Modern Physics Letters B 34, no. 30 (July 15, 2020): 2050330. http://dx.doi.org/10.1142/s0217984920503303.

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We report a quasi-semicircle GaN ultraviolet microcavity laser. Poincaré map of the quasi-semicircle cavity shows periodic, quasi-periodic and chaotic optical trajectories. Finite-element-method optical near-field distribution patterns of the periodic optical modes agree with the optical loops in the quasi-semicircle cavity. Based on the numerical results, optically pumped lasing experiment shows that ultraviolet multimode lasing action from different optical resonance modes can be effectively stimulated at low pumping intensity in the quasi-semicircle GaN cavity, and the side-mode suppression phenomenon can be obtained at high pumping intensity. Because the possible period optical loops are quasi-periodic and unstable, the quasi-whispering-gallery mode lasing with higher quality factor prefer to dominate the lasing action under high pumping. The experimental and simulated lasing modes suggest that side-mode suppression phenomenon can be caused by the mode competition between quasi-whispering-gallery modes and other quasi-periodic modes.

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7

Cheng, Yang, Aidan J. Lee, Guanzhong Wu, Denis V. Pelekhov, P. Chris Hammel, and Fengyuan Yang. "Nonlocal Uniform-Mode Ferromagnetic Resonance Spin Pumping." Nano Letters 20, no. 10 (September 21, 2020): 7257–62. http://dx.doi.org/10.1021/acs.nanolett.0c02640.

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Rozanov, Leonid, and Aleksandr Kirillov. "Non-stationary volume-adsorption model for pumping of vacuum chambers." MATEC Web of Conferences 245 (2018): 04007. http://dx.doi.org/10.1051/matecconf/201824504007.

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The non-stationary mathematical model of pumping of gas, located in the volume and adsorbed on the inner surface of vacuum chambers is considered. A feature of the model is the use of variation of adsorption heat with respect to the logarithm of the degree of coverage obtained from the Frendlich adsorption isotherm. The relations between pressure, gas release, heat of adsorption, the amount of adsorbed gas and the pumping time are calculated. The existence of a regular pumping mode is shown. Experimental verification of the model confirms the theoretical calculations. The model makes it possible to specify the pumping time of International Thermonuclear Experimental Reactor vacuum chambers and to obtain a significant economic effect when selecting pumping means by reducing the safety factor.

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9

Wang, Sen, Yang Yang Zhao, Hong Kui Yan, Dong Ling Liu, Dong Sheng Zhao, Si Yang Li, Yan Long Ren, and Jia Cheng Guo. "Multi-Physics Coupling Analysis of Efficient Pumping Unit Linear Motor." Applied Mechanics and Materials 872 (October 2017): 251–55. http://dx.doi.org/10.4028/www.scientific.net/amm.872.251.

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Taking efficient pumping-unit linear motor as the research object in this paper, SOLIDWORK has been used to establish 3D model and analyze multi-physics of the efficient pumping-unit linear motor, including vibration mode, stress analysis and the analysis of temperature field. Through the simulation analysis, getting efficient pumping unit linear motor of the top five order vibration frequency, pressure distribution and temperature distribution, theoretical references are provided for the analysis of the efficient pumping-unit linear motor. The innovation of the article is in coupling analysis of multi-physics.

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10

GUDKOVA, N. K., T. L. GORBUNOVA, and N. I. МАTOVA. "INFLUENCE OF MSW LANDFILLS ON DEGRADATION OF BIOGEOCENOSES OF COASTAL ZONES OF WATER COURSES AND THE BLACK SEA." Prirodoobustrojstvo, no. 5 (2021): 117–24. http://dx.doi.org/10.26897/1997-6011-2021-5-117-124.

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Since reducing energy consumption is a priority for an enterprise, economic effi ciency in general is directly related to the use of pumping equipment. The demand for electricity for pumping equipment will depend on various factors: the operating modes of pumping stations and installations, the equipment used measures to reduce the cost of electricity consumed, etc. The current practice indicates extremely inefficient operation of pumping equipment. Currently, a large number of pumping stations of water supply and sanitation systems operate in an uneconomical mode. Very often, this is due to incorrect selection of pumping equipment, outdated pumping equipment, the operation of pumps in non- calculation mode. In addition, pumping equipment has been installed in many industries since the establishment of production. Such equipment is morally and technically outdated. Now,technological progress allows us to use more efficient equipment and materials that allow us to reduce energy consumption. The article presents an analysis of the energy consumption of a pumping station of technical water supply on the example of JSC «Omsk Kauchuk», a variant of modernization is proposed in order to reduce the consumption of electricity by pumping equipment. The need to modernize the pumping station of technical water supply is associated with a significant service life and high –energy consumption of pumping equipment. Two pump brands were selected and a comparative analysis was carried out. Based on calculations of energy consumption and technological characteristics, the most profitable and optimal version of the D6300-80-2b pump was chosen, since the pump performance is greater and the power consumption is less than that of the JETEX DS600-750 pump, as well as reducing the wear rate of operating elements, improving the pump’s suction capacity

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11

КОRCHEVSKAYA, YU V., I. A. TROTSENKO, and E. E. NAZARKIN. "MODERNIZATION OF THE PUMPING STATION OF TECHNICAL WATER SUPPLY ON THE EXAMPLE OF JSC «OMSK KAUCHUK»." Prirodoobustrojstvo, no. 5 (2021): 111–16. http://dx.doi.org/10.26897/1997-6011-2021-5-111-116.

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Since reducing energy consumption is a priority for an enterprise, economic effi ciency in general is directly related to the use of pumping equipment. The demand for electricity for pumping equipment will depend on various factors: the operating modes of pumping stations and installations, the equipment used measures to reduce the cost of electricity consumed, etc. The current practice indicates extremely inefficient operation of pumping equipment. Currently, a large number of pumping stations of water supply and sanitation systems operate in an uneconomical mode. Very often, this is due to incorrect selection of pumping equipment, outdated pumping equipment, the operation of pumps in non- calculation mode. In addition, pumping equipment has been installed in many industries since the establishment of production. Such equipment is morally and technically outdated. Now,technological progress allows us to use more efficient equipment and materials that allow us to reduce energy consumption. The article presents an analysis of the energy consumption of a pumping station of technical water supply on the example of JSC «Omsk Kauchuk», a variant of modernization is proposed in order to reduce the consumption of electricity by pumping equipment. The need to modernize the pumping station of technical water supply is associated with a significant service life and high –energy consumption of pumping equipment. Two pump brands were selected and a comparative analysis was carried out. Based on calculations of energy consumption and technological characteristics, the most profitable and optimal version of the D6300-80-2b pump was chosen, since the pump performance is greater and the power consumption is less than that of the JETEX DS600-750 pump, as well as reducing the wear rate of operating elements, improving the pump’s suction capacity

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12

Bekibayev, T. T., G. I. Ramazanova, and M. A. Pakhomov. "The problem of optimizing pumping units for oil transportation." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 321, no. 2 (March 2, 2022): 38–46. http://dx.doi.org/10.31643/2022/6445.16.

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During pipeline transportation of oil through main oil pipelines, the greater part of the energy consumed is spent on the operation of main and booster pumping units at oil pumping stations. In this regard, the determination of the optimal operating modes of pumping units is an urgent problem for energy saving. The article is devoted to the optimization of the operation of pumping units for energy saving of oil pipeline transport. The operation of pumping units is regulated using removable rotors with different diameters of impellers or a frequency-controlled drive. An optimization criterion has been formulated to minimize the operating costs of pumping units. A technique for determining the energy consumption of pumping units with different diameters of impellers and a frequency-controlled drive is presented. An algorithm for finding the optimal operating mode of pumping units is presented, which was built using the definitions of graph theory and dynamic programming.

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13

Ishnazarov, Oybek, Abdusaid Isakov, Utkir Islomov, Umirzoq Xoliyorov, and Dilshod Ochilov. "Wear issues of pumping units." E3S Web of Conferences 264 (2021): 04081. http://dx.doi.org/10.1051/e3sconf/202126404081.

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The article presents the possibility of increasing the service life of pumping units. Particular attention is paid to the regulation of the speed of rotation of the pumping unit. There are some assumptions in the mathematical model that do not affect the final result. The factors influencing the operating mode are given. It is indicated that the speed of rotation of the pump shaft significantly affects the wear resistance of the pump blades. Thus, the regulation of the pump rotation speed will rationally increase its service life.

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14

Yaremak, I. I., Ya V. Batsala, and R. О. Yaremak. "Estimation of energy efficiency potential of electric drive pumping units in steady operating modes." Oil and Gas Power Engineering, no. 2(36) (December 29, 2021): 88–97. http://dx.doi.org/10.31471/1993-9868-2021-2(36)-88-97.

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According to the results of studies of steady operation modes of electric pumping units of Ukrainian oil pumping stations, have been identified the main reasons of efficiency decrease of their performance during operation. It is determined that the normative documents regulating the efficient operation of pumping units of the main oil pipelines of Ukraine need to be improved. The assessment of energy efficiency potential of the main pumping unit on the example of pump НМ-3600-230 with synchronous electric drive СТД-2500-2 is carried out and the main ways to increase the efficiency of electricity use at oil pumping stations of main oil pipelines are analyzed. A complex mathematical-graphic model of a centrifugal pump and a synchronous electric motor is used to determine the parameters of the process of energy consumption and energy use of hydraulic and electrical subsystems of the pump unit, which allowed to take into account possible changes in equipment characteristics and modes of operation. The value of the relative specific consumption of electricity for pumping of working fluid for regulated and unregulated electric drive based on a complex electro-hydraulic model of the main pump was calculated, which allowed to promptly recalculate the characteristics of the centrifugal pump and electric motor taking into account their technical condition and to determine the potential of the pumping unit. It is determined that an effective way to reduce energy consumption by main pumping units is applying of a controlled electric drive at oil pumping stations, but the feasibility of such a measure requires additional technical and economical calculations. It is determined that to increase the efficiency of pumping units is necessary to avoid low flow-duty modes, to form maps of main oil pipelines in a way to ensure optimal in terms of energy efficiency operation modes of electro-hydraulic equipment of oil pumping stations and to change operation mode of pump and motor in terms of their technical condition.

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15

Dadar, Sara, Bojan Đurin, Ebrahim Alamatian, and Lucija Plantak. "Impact of the Pumping Regime on Electricity Cost Savings in Urban Water Supply System." Water 13, no. 9 (April 21, 2021): 1141. http://dx.doi.org/10.3390/w13091141.

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The main purpose of the presented research is to raise the efficiency of pumping stations’ operational work by developing a model for reducing energy costs in urban water supply systems. Pumping systems are responsible for a significant portion of the total electrical energy use. Significant opportunities exist to reduce the pumping energy through smart design, retrofitting, and operating practices. Today, considering the increase in pumping energy prices in water conveyance systems, the problem of optimal operation of pumping stations is very actual. The optimal operation of pumping stations was determined using a Genetic Algorithm Optimization (GAO) to achieve the minimum energy cost. The paper presents a novel management model for the optimal design and operation of water pumping systems on a real case study for the town of Gonabad in Iran. To achieve this goal, three days in a year were selected randomly. The results indicate that the proposed mode in conjunction with a GAO is a versatile management model for the design and operation of the real pumping station. Modeling results show that optimization with a GAO reduces power consumption by about 15–20%.

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16

ElOugli, A., S. Miqoi, M. Boutouba, and B. Tidhaf. "Sliding mode controller for a photovoltaic pumping system." IOP Conference Series: Materials Science and Engineering 186 (March 2017): 012030. http://dx.doi.org/10.1088/1757-899x/186/1/012030.

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17

Ghasem, Nayef Mohamed. "Combined mode of operation for thermal parametric pumping." Journal of Chemical Technology & Biotechnology 78, no. 6 (2003): 666–69. http://dx.doi.org/10.1002/jctb.845.

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18

Bityukov, V. K., V. A. Petrov, and A. A. Sotnikova. "Operation of an inverting DC-DC converter with charge pumping and LDO in the LM 27762 microcircuit." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 1 (March 30, 2019): 35–43. http://dx.doi.org/10.38013/2542-0542-2019-1-35-43.

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The paper focuses on the study of operation of an inverting DC-DC converter with charge pumping and LDO, which are the part of the combined bipolar secondary power supply LM 27762. The measurements covered two modes amply included in the range of normalized parameters with input voltages equal to 3.5 and 5.5 V, and output voltages 1.8 and 4.9 V, respectively, as well as the mode with an input voltage of 5.0 V and an output voltage 4.7 V, with a difference in the input and output voltage not exceeding the normalized limit of the voltage drop across LDO . Pulsations of voltages were measured at various load currents from 15 to 250 mA at the positive and negative poles of the flying capacitor, at the output of the charge pumping system and, in the latter case, also at the output of the microcircuit. Based on the results obtained, it was shown for the first time how at low load currents up to about 100 mA the charge pumping system operates in the burst mode, and at higher currents, it operates in the charge pumping mode with a constant frequency

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19

Ikramov, Nazir, Eduard Kan, Mirasil Mirzoev, and Takhir Majidov. "Effect of parallel connection of pumping units on operating costs of pumping station." E3S Web of Conferences 97 (2019): 05014. http://dx.doi.org/10.1051/e3sconf/20199705014.

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In Uzbekistan, as well as in many other countries of the world, pumping units operate in parallel into a common pressure pipeline at some pumping stations of the irrigation system. This was done mainly to save on the capital costs of the pipeline. Analysis and hydraulic calculation of the existing large irrigation pumping stations with pumping units operating in parallel showed that at some of them the conditions of parallel operation of pumping units were impaired. As a result, a negative hydraulic process arises, in the form of self-induced vibrations of the water flow in the pipeline, which leads to various damage and deformation of the pressure pipeline and pipeline supports. The calculations showed that with different modes of pumping units operating together, the power consumption at the Amu-Bukhara-1 and Namangan pumping stations, accounting for one unit increases by 0.72 ... 6.53%, and at the Amu-Bukhara-2 and Amu-Zang-2 pumping stations, this index, on the contrary, decreases by 0.32 ... 1.67%. Therefore, a properly selected operating mode of parallel-connected pumping units will lead to a decrease in operating costs, i.e. decrease in the prime cost of raised water.

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20

Dem'Yanenko, A. V., G. A. Polyakov, and A. A. Puretzky. "IR-Luminescence of CF2Cl2 Molecules in Multiple-Photon Excitation With Co2-Laser Radiation." Laser Chemistry 8, no. 2-4 (January 1, 1988): 123–35. http://dx.doi.org/10.1155/lc.8.123.

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We studied the IR luminescence spectra of vibrationally excited CF2Cl2 molecules resulting from excitation of the ν1 (1098 cm−1) and ν8 (922 cm−1) modes with a pulsed CO2 laser. The nonequilibrium spectra obtained under pumping conditions where their equilibrium counterparts coincide (the number of the photons absorbed per molecule being the same) were found to differ considerably. We suppose that this difference is due to different types of vibrational distribution formed as a result of the IR laser pumping. When pumping the ν1 mode, excitation of the R-branch occurs, resulting in the molecules “sticking” on the lower vibrational levels, whereas in the case of the ν8 mode, it is the P-branch that gets excited so that the molecules become easy to raise to high-lying vibrational levels.

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21

Akimov, A. A., S. A. Guzairov, and V. V. Ivakhnik. "Quality of radiation conversion under four-wave mixing on thermal nonlinearity with feedback." Computer Optics 5, no. 45 (September 2021): 667–72. http://dx.doi.org/10.18287/2412-6179-co-888.

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Quality of radiation conversion under four-wave mixing on thermal nonlinearity with feedback for both signal and object waves has been investigated at high reflection coefficients. It has been shown that the optimal operating mode of a four-wave converter on thermal nonlinearity is the mode in which the pumping waves have equal intensities and there is a compensation for a phase shift arising from the pumping wave self-action. In this operating mode of the four-wave radiation converter, as compared with the case of the absence of feedback for both signal and object waves, a significant increase in the amplitude reflection coefficient is observed with an increase in the pumping waves intensities. In this case, despite the decrease in the bandwidth of spatial frequencies of the object wave with an increase in the pumping wave intensities, the quality of radiation conver-sion with feedback for both signal and object waves is better than in the absence of feedback.

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22

Akimov, A. A., S. A. Guzairov, and V. V. Ivakhnik. "Quality of radiation conversion under four-wave mixing on thermal nonlinearity with feedback." Computer Optics 5, no. 45 (September 2021): 667–72. http://dx.doi.org/10.18287/2412-6179-co-888.

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Quality of radiation conversion under four-wave mixing on thermal nonlinearity with feedback for both signal and object waves has been investigated at high reflection coefficients. It has been shown that the optimal operating mode of a four-wave converter on thermal nonlinearity is the mode in which the pumping waves have equal intensities and there is a compensation for a phase shift arising from the pumping wave self-action. In this operating mode of the four-wave radiation converter, as compared with the case of the absence of feedback for both signal and object waves, a significant increase in the amplitude reflection coefficient is observed with an increase in the pumping waves intensities. In this case, despite the decrease in the bandwidth of spatial frequencies of the object wave with an increase in the pumping wave intensities, the quality of radiation conver-sion with feedback for both signal and object waves is better than in the absence of feedback.

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23

Zhang, Quan, Junjie Yu, Biran Shi, Fanchun Tang, and Jianlang Li. "LG11-mode vortex Nd:YAG laser by applying second-order circular Dammann grating for annular pumping." Chinese Optics Letters 17, no. 5 (2019): 051402. http://dx.doi.org/10.3788/col201917.051402.

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24

Vakakis, Alexander F., D. Michael McFarland, Lawrence Bergman, Leonid I. Manevitch, and Oleg Gendelman. "Isolated Resonance Captures and Resonance Capture Cascades Leading to Single- or Multi-Mode Passive Energy Pumping in Damped Coupled Oscillators." Journal of Vibration and Acoustics 126, no. 2 (April 1, 2004): 235–44. http://dx.doi.org/10.1115/1.1687397.

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We examine passive energy pumping in a system of damped coupled oscillators. This is a one-way, passive and irreversible energy flow from a linear main system to a nonlinear attachment that acts, in essence, as a nonlinear energy sink (NES). Energy pumping is caused by 1:1 resonance captures on resonant manifolds of the damped systems. We show that the NES is capable of absorbing significant portions of the energies generated by transient, broadband external excitations. By performing a series of numerical simulations we confirm that the energy dependence of the nonlinear normal modes (NNMs) of the underlying undamped, unforced system determines, in essence, the resonance capture and energy pumping dynamics in the corresponding damped system. We present numerical simulations of single- and multi-mode energy pumping, that involve isolated resonance captures or resonance capture cascades, respectively. In addition, we discuss methodologies for enhancing the nonlinear energy pumping phenomenon by properly selecting the system parameters. The described technique of passively localizing and locally eliminating externally induced energy provides a new paradigm for vibration and shock isolation of mechanical oscillators.

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Adjati, Arezki, Toufik Rekioua, and Djamila Rekioua. "Degraded Mode of Dual Stator Induction Motor in Pumping." Journal Européen des Systèmes Automatisés 53, no. 2 (May 20, 2020): 273–82. http://dx.doi.org/10.18280/jesa.530215.

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El-Jouni, A., M. Guisser, and M. Salhi. "A Sliding Mode Optimization of a Photovoltaic Pumping System." International Review on Modelling and Simulations (IREMOS) 7, no. 3 (June 30, 2014): 466. http://dx.doi.org/10.15866/iremos.v7i3.339.

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27

Auerbach, D., and M. Moser. "Phase doublidg during liebau pumping in the pressure mode." Journal of Biomechanics 39 (January 2006): S633. http://dx.doi.org/10.1016/s0021-9290(06)85635-6.

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28

Semaltianos, N. G., A. De Rossi, B. Vinter, V. Berger, M. Calligaro, and V. Ortiz. "Electrical pumping of a third-order mode semiconductor laser." Optics & Laser Technology 36, no. 8 (November 2004): 669–76. http://dx.doi.org/10.1016/j.optlastec.2004.02.001.

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Liu, Guohua, and Deming Liu. "Optimization of pumping mode for double-clad fiber lasers." Optics & Laser Technology 40, no. 2 (March 2008): 256–60. http://dx.doi.org/10.1016/j.optlastec.2007.04.010.

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30

Haas, T., J. De Schutter, M. Diehl, and J. Meyers. "Wake characteristics of pumping mode airborne wind energy systems." Journal of Physics: Conference Series 1256 (July 2019): 012016. http://dx.doi.org/10.1088/1742-6596/1256/1/012016.

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31

Tibúrcio, B. D., D. Liang, J. Almeida, D. Garcia, and C. R. Vistas. "Dual-rod pumping concept for TEM00-mode solar lasers." Applied Optics 58, no. 13 (April 26, 2019): 3438. http://dx.doi.org/10.1364/ao.58.003438.

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32

Marouani, Rym, Mohamed Adel Sellami, and Abdelkader Mami. "Photovoltaic Water Pumping System Controlled by Cascade Sliding Mode." Research Journal of Applied Sciences, Engineering and Technology 7, no. 20 (May 20, 2014): 4364–69. http://dx.doi.org/10.19026/rjaset.7.810.

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33

Fang, Zhiqiang, Kegui Xia, Yao Yao, and Jianlang Li. "Radially polarized LG01-mode Nd:YAG laser with annular pumping." Applied Physics B 117, no. 1 (April 10, 2014): 219–24. http://dx.doi.org/10.1007/s00340-014-5825-y.

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34

Fetisov, Y. K., and A. A. Klimov. "Optical mode conversion in YIG film under microwave pumping." Journal of Magnetism and Magnetic Materials 140-144 (February 1995): 2119–20. http://dx.doi.org/10.1016/0304-8853(94)01398-5.

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35

Wang, Gui Chao, Shen Jie Zhou, Feng Ling Yang, and Song Ying Chen. "A CFD Study of an up- and a down-Pumping PBT Impeller in Solid-Liquid Stirred Tank." Advanced Materials Research 354-355 (October 2011): 696–700. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.696.

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Particles concentration distribution in a stirred tank with pitched blade turbine was investigated using computational fluid dynamics. The effect of the pumping mode on the turbulent flow and particles concentration distribution was studied. The turbulent solid-liquid flow in a stirred tank was simulated using a two-fluid model with standard k-ε turbulence model. The multiple reference frames approach was used to simulate impeller rotation. Results show that different pumping modes create different flow field which decide the characteristics of the mixing quality. A further detailed discussion about particles mixing at the bottom of the stirred tank was made. The computational model and the predicted results discussed here would be useful for understanding the solid-liquid mixing process.

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Vorobieva, E. V., V. V. Ivakhnik, and M. V. Luneva. "TIME DEPENDENCE OF THE POINT SPREAD FUNCTION OF A FOUR-WAVE CONVERTER IN A WAVEGUIDE WITH THERMAL NONLINEARITY." Vestnik of Samara University. Natural Science Series 20, no. 10 (May 29, 2017): 130–39. http://dx.doi.org/10.18287/2541-7525-2014-20-10-130-139.

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The time dependence of a quality of wave-front reversal has been analyzed at four-wave interaction in a waveguide with thermal nonlinearity. The inﬂuence of waveguide parameters and mode structure of pumping waves on time dependence character has been investigated. It has been shown, that increases of number of single-mode pumping waves lead to decreases of diﬀerence in point spread function width in steady state and initial state.

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Ahmadov, I. Z., S. E. Taghiyeva, and G. G. Guseinov. "Estimation of impact of pumping rate on operation parameters of sucker-rod pumps." Azerbaijan Oil Industry, no. 1 (January 15, 2021): 17–23. http://dx.doi.org/10.37474/0365-8554/2021-1-17-23.

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The paper presents the results of studies on the estimation of quantitative and qualitative impact of fluid pumping rate of sucker-rod pumps on the production parameters, as well as on the frequency of repair and overhaul period of the wells on the late stage of field development. The distribution of speed rates of pumping by wells and dependences of flowrates, flooding and coefficients of pumping capacity from pumping delivery have been analyzed based on the actual field data as well. The studies showed faster growth of water discharge compared to the oil, as well as reduction of oil delivery rate with increasing pumping speed. It is justified that the overhaul period reduces and the frequency of repair increases with raising pumping speed. The study results enable to make conclusions on the practicability of pumping speed limitation, as well as the necessity of measures towards flooding and reasonable selection of mode parameters for sucker-rod pumping during the exploitation of reviewed field.

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Comişel, Horia, Yasuhiro Nariyuki, Yasuhito Narita, and Uwe Motschmann. "On the role of ion-scale whistler waves in space and astrophysical plasma turbulence." Annales Geophysicae 34, no. 11 (November 9, 2016): 975–84. http://dx.doi.org/10.5194/angeo-34-975-2016.

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Abstract. Competition of linear mode waves is studied numerically to understand the energy cascade mechanism in plasma turbulence on ion-kinetic scales. Hybrid plasma simulations are performed in a 3-D simulation box by pumping large-scale Alfvén waves on the fluid scale. The result is compared with that from our earlier 2-D simulations. We find that the whistler mode is persistently present both in the 2-D and 3-D simulations irrespective of the initial setup, e.g., the amplitude of the initial pumping waves, while all the other modes are excited and damped such that the energy is efficiently transported to thermal energy over non-whistler mode. The simulation results suggest that the whistler mode could transfer the fluctuation energy smoothly from the fluid scale down to the electron-kinetic scale, and justifies the notion of whistler turbulence.

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Niu, Ben, Kun Ge, Zhiyang Xu, Xiaoyu Shi, Dan Guo, and Tianrui Zhai. "Laser Diode Pumped Polymer Lasers with Tunable Emission Based on Microfluidic Channels." Polymers 13, no. 20 (October 13, 2021): 3511. http://dx.doi.org/10.3390/polym13203511.

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Tunable whispering-gallery-mode (WGM) lasers have been paid lots of attention for their potential applications in the photonic field. Here, a tunable polymer WGM laser based on laser diode pumping is realized with a threshold of 0.43 MW/cm2 per pulse. The WGM laser is realized by a microfluidic microcavity, which consists of a quartz capillary and gain materials. The laser performance keeps stable for a long time (3.5 h), pumped by a 50-ns 50 Hz laser diode with a pumping peak power density of 1.08 MW/cm2 per pulse. The lasing wavelength can be tuned over 15 nm by changing the gain material concentration from 3.5 mg/mL to 12.5 mg/mL in the microfluidic channel. Moreover, the lasing mode can be switched between transverse magnetic (TM) and transverse electric (TE) modes by adjusting the pump polarization. These results provide the basis for designing nanophotonic devices with laser diode pumping.

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Vaughan, Martin, Hadi Susanto, Ian Henning, and Mike Adams. "The Overlap Factor Model of Spin-Polarised Coupled Lasers." Photonics 8, no. 3 (March 20, 2021): 83. http://dx.doi.org/10.3390/photonics8030083.

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A general model for the dynamics of arrays of coupled spin-polarised lasers is derived. The general model is able to deal with waveguides of any geometry with any number of supported normal modes. A unique feature of the model is that it allows for independent polarisation of the pumping in each laser. The particular geometry is shown to be introduced via ’overlap factors’, which are a generalisation of the optical confinement factor. These factors play an important role in determining the laser dynamics. The model is specialised to the case of a general double-guided structure, which is shown to reduce to both the spin flip model in a single cavity and the coupled mode model for a pair of guides in the appropriate limit. This is applied to the particular case of a circular-guide laser pair, which is analysed and simulated numerically. It is found that increasing the ellipticity of the pumping tends to reduce the region of instability in the plane of pumping strength versus guide separation.

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Zhang, Chong, Kaixuan Tan, Tingting Xie, Yahui Tan, Lingdi Fu, Nan Gan, and Lingzhen Kong. "Flow Microbalance Simulation of Pumping and Injection Unit in In Situ Leaching Uranium Mining Area." Processes 9, no. 8 (July 26, 2021): 1288. http://dx.doi.org/10.3390/pr9081288.

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In situ leaching (ISL) uranium mining technology is an in situ mining technology in which the chemical solution is injected into the ore-bearing strata through drilling wells, and the solution moves along the ore bed by controlling the hydraulic gradient of the flow field and reacts with the ore to form uranium-bearing solution. To reduce leaching dead angle in the process of leaching, each pumping and injection unit should achieve uniform leaching at the end of production, and appropriate pumping and injection mode should be adopted for pumping and injection wells of each unit in the mining area. In this paper, on the basis of the actual production data of a sandstone uranium mine, we established the unit flow model of ISL uranium mining area by using GMS software. The unit flow balance of 72 boreholes in the whole mining area was analyzed and optimized through the model. The concept of flow microbalance of pumping and injection unit in the mining area is put forward for the first time, and the calculation equation of supply and receive the flow of pumping and injection well is determined. The calculation and analysis process of flow microbalance of pumping and injection unit in mining area is established. The simulation results showed that the application effect of the model was good, and the correlation coefficient of the solute transport model reached 0.8.

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Zhu, Xi, Jian Guo Song, and Qing Lu Zhang. "Investigation on All Digital Control System of Brushless DC Motor for Beam-Pumping Unit." Applied Mechanics and Materials 336-338 (July 2013): 728–33. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.728.

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In order to drive beam-pumping unit with brushless DC motor (BLDCM), a kind of motor speed regulator was investigated. When pumping unit is in up stroke, BLDCM is power-driven; when in down stoke, pumping unit is braked by BLDCM. To meet the operation mode, PI double closed loops control strategy and Pulse Width Modulation (PWM) are applied. Simulation and test in field show that our design has good control effect and popularizing value.

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Tereshchenko, E. D., R. Y. Yurik, and L. Baddeley. "Stimulated electromagnetic emission polarization under different polarizations of pump waves." Annales Geophysicae 33, no. 3 (March 5, 2015): 295–300. http://dx.doi.org/10.5194/angeo-33-295-2015.

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Abstract. The results of investigations into the stimulated electromagnetic emission (SEE) polarization under different modes of the pump wave polarization are presented. The present results were obtained in November 2012 during a heating campaign utilizing the SPEAR (Space Plasma Exploration by Active Radar) heating facility, transmitting in both O- and X-mode polarization, and a PGI (Polar Geophysical Institute) radio interferometer capable of recording the polarization of the received radiation. The polarization ellipse parameters of the SEE DM (downshifted maximum) components were determined under both O-mode and X-mode polarization of the pump waves. The polarization direction of the SEE DM component was preserved under different polarizations of the pump waves. Different polarizations of the pump waves have a different SEE generation efficiency. The intensity of the DM component is observed to be greater during O-mode pumping. In addition, the numbers of observed SEE features are also greater during O-mode pumping.

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Tevyashev, Andrei, Olga Matviyenko, and Glib Nikitenko. "Stochastic Model and Method of Optimization of Operation Modes of a Group of Artesian Wells in Water Supply Systems." Pidvodni tehnologii, no. 11 (October 29, 2021): 56–66. http://dx.doi.org/10.32347/uwt2021.11.1501.

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Groups of spatially distributed wells interconnected by sections of pipelines (a common collector) supplying water to a clean water reservoir are used in water supply systems in order to provide drinking water to settlements. A group of wells together with a clean water reservoir is called a water intake facility of the water supply system. Further, water is supplied from the clean water reservoir to consumers in settlements by means of second stage pumping stations. In terms of each well the operating mode of the submersible pumping unit, i.e. the position of its operating point at a fixed moment in time, depends on the actual values of many internal and external factors: dynamic water level in the well; the actual characteristics of the pumping unit; the position of the final control elements (drive speed, opening degree of the regulating valve); hydraulic resistances of pipeline sections of the water intake facility; the water level in the clean water reservoir; the number and operating modes of pumping units in other wells of the water intake facility. The paper describes a deterministic model of a water intake well. At the same time, the processes of water consumption are random processes, since they depend on many uncontrolled and unmanageable factors. The parameters of the technological equipment of the water intake facility are also random values, since they are estimated from experimental data of finite length. Therefore, a stochastic model of a water intake well is also proposed. A model of a quasi-stationary operation mode of a water intake facility, which is used to optimize the operation of a group of artesian wells operating on a common collector, is considered.

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Trossman, David S., Lu Anne Thompson, Kathryn A. Kelly, and Young-Oh Kwon. "Estimates of North Atlantic Ventilation and Mode Water Formation for Winters 2002–06." Journal of Physical Oceanography 39, no. 10 (October 1, 2009): 2600–2617. http://dx.doi.org/10.1175/2009jpo3930.1.

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Abstract Lagrangian estimates for ventilation rates in the Gulf Stream Extension using Argo and World Ocean Circulation Experiment/Atlantic Climate and Circulation Experiment (WOCE/ACCE) float data, scatterometer (QuikSCAT) wind stress satellite observations, and altimetric [Archiving, Validation, and Interpretation of Satellite Oceanographic data (AVISO)] sea surface height (SSH) satellite observations from 2002 to 2006 are presented. Satellite winds and estimates of surface geostrophic currents allow the inclusion of the effects of currents on wind stress as well as their impact on the Ekman pumping. The presence of large surface geostrophic currents decreases the total Ekman pumping, contributing up to 20% where the Gulf Stream makes its two sharpest turns, and increases the total Ekman pumping by 10% or less everywhere else. The ageostrophic currents may be as large as 15% of the geostrophic currents, but only in proximity of the Gulf Stream. Using currents and mixed layer depths (MLDs) that are either climatological or vary from year to year, obducted water tends to originate along the Gulf Stream, while subducted water tends to originate to its south. However, using time-varying MLDs for each year, subduction varies significantly, sometimes oppositely from obduction. The 18° Water (EDW) subducts in different locations and is distributed differently each year but tends to be located in the Sargasso Sea. Vertical pumping is the only dominant factor in ventilation closer to the coast where MLDs are shallower and lighter parcels are subducted. Vertical pumping contributes up to 20% of the several hundreds of ventilated meters per year around the Gulf Stream and less elsewhere. Using a temperature- or density-based criterion for estimating the MLDs, especially along the coasts and north of 45°N, obduction estimates differ by up to 25%. The horizontal and temporal structure of the MLDs is the primary factor that controls the tens of sverdrups of ventilation (and a few sverdrups of EDW subduction).

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Аbidov, Kudrat Gayratovich, Odiljon Olimjonovich Zaripov, and Shakhlo Olimovna Zaripova. "ANALYSIS OF THE CALCULATION TECHNIQUE WHEN DETERMINING THE NUMBER OF SIMULTANEOUSLY STARTING PUMPING UNITS." INNOVATION IN THE OIL AND GAS INDUSTRY 2, no. 1 (January 30, 2021): 5–10. http://dx.doi.org/10.26739/2181-1482-2021-1-1.

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The article deals with the calculation technique for determining the number of self-starting pumping units depending on the network voltage setting and the main design dependencies of the self-starting process of electric motors fed from a three-phase three-winding transformer, and a replacement circuit for one phase of the circuit is made up. Technical solutions for the modernization of pumping units are proposed, which allow the application of the self-starting mode at reclamation pumping stations

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Mao, Kun Li. "Modal Analysis of Concrete Pump Truck Boom." Advanced Materials Research 889-890 (February 2014): 148–51. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.148.

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Boom is one of key components of concrete pump trucks which can be looked as a projecting beam when unfolded at pumping mode. Under different concrete pumping modes, vibration of boom is serious for the hydraulic cylinder switching over shock, which can lead to the early damage of boom structure. In the finite element analysis software, boom of 37 meters concrete pump truck is simulated for its modal. Natural frequencies and corresponding modes are got and analyzed. To reduce vibration of concrete pump trucks, advices are presented by finite element modal analysis.

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48

Yaremak, I. I. "THE ELECTRIC DRIVE PUMPING UNITS STEADY OPERATING MODES OPTIMIZATION BY THE MODES RELIABILITY CRITERIAS." METHODS AND DEVICES OF QUALITY CONTROL, no. 1(42) (June 27, 2019): 24–32. http://dx.doi.org/10.31471/1993-9981-2019-1(42)-24-32.

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According to the research results, the target functions of the task of optimizing the functioning of the units according to the criteria of the regime reliability, depending on the flow of the working fluid were synthesized, which made it possible to research the influence of the regime on the reliability of operation of electric and hydraulic subsystems of the pump unit. The extreme weight of local target functions of regime reliability of electric motor and the centrifugal pump in various (especially low-flow rate) operating modes are determined. It is proposed to optimize the operating modes of pumping units of oil pumping station with the simultaneous use of the reliability criteria of electric drive and centrifugal pump. . It was established that the maximum values of reliability of electric drive and centrifugal pump are achieved at different values of the load, which requires the involvement of multi-criteria optimization methods. The problem of optimization of the established modes of the pump unit in the multicriteria setting, taking into account the technological limitations of its subsystems was formalized. The analysis of modern methods of solving the problem of multicriteria optimization of the steady modes of operation of pump units is carried out. The method of solving the multicriterion optimization problem is substantiated, which fully takes into account the influence of operation mode on the reliability of electric and hydraulic subsystems of pumping unit. It is revealed that the most appropriate method for solving this problem is the method of approaching an ideal (utopian) point in the criteria space. With this method, the desired ratio of criteria at the optimum point is the best. The value of the "agreed optimum" of liquid flow has been determined in order to choose the optimum for the reliability of operation mode of the pumping unit of oil pumping station.

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Genin, Valeriy S., Lidia N. Vasileva, Nadezhda N. Ivanova, Elmira M. Artykaeva, and Tatiana V. Dmitrieva. "AUTOMATION OF CONTROL OF ROOM DEEP OIL PUMP USINGTRACE MODE SCADA SYSTEMS." Vestnik Chuvashskogo universiteta, no. 1 (March 30, 2022): 53–64. http://dx.doi.org/10.47026/1810-1909-2022-1-53-64.

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The issues of automation of technological processes are relevant for all industries. The article discusses the issues of automating the control of the operation of oil pumping units widely used in oil production using the TRACE MODE SCADA system from AdAstrA Research Group. To control the operation of a sucker rod pump of an oil pumping unit, the use of dynamometers is widespread in world practice. Technically, it is easier to carry out a more generalized control of the operation of an oil pumping unit using a wattmetergram, which displays the dependence of the active power consumed by the drive on time or the position of the polished rod. The results of power measurements are transmitted via communication channels to the computer of the SCADA system. Further, preliminary processing of the results of the control of the wattmeter diagram and the calculation of parameters characterizing the operation of the oil pumping unit are performed. At the stage of data preprocessing, noise filtering is performed using TRACE MODE tools that provide data exchange with MS Excel, MS Access, MS Visual Basic packages. The use of moving average, median filtering, and B-splines methods for this is considered. It is shown that cubic B-splines are an effective method of analytical description and graphical representation of experimental data, reducing the total mean square of the error. The use of splines in comparison with the polynomial approximation gives a slightly better approximation. The results of filtering and calculations by means of the SCADA system are displayed on the dispatcher’s monitor, archived, documented, etc. Thus, the related software products SCADA TRACE MODE and MS allow you to effectively implement complex data processing algorithms.

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Zhao, Guopeng, Jiyun Ren, Qiang Zhao, and Minxiao Han. "Simulation Method for Generating Mode and Pumping Mode Switching of Pumped Storage Hydropower Plant." IOP Conference Series: Materials Science and Engineering 394 (August 8, 2018): 042084. http://dx.doi.org/10.1088/1757-899x/394/4/042084.

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Journal articles on the topic 'Pumping mode'

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