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Journal articles on the topic 'Capacitance calculation'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Wardaya, Asep Yoyo, Zaenul Muhlisin, Jatmiko Endro Suseno, Charis Munajib, Susilo Hadi, Heri Sugito, and Jaka Windarta. "Capacitance Calculation Model in Corona Discharge Case." Mathematical Modelling of Engineering Problems 9, no. 5 (December 13, 2022): 1161–71. http://dx.doi.org/10.18280/mmep.090501.

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The (I-V) characteristic pattern of the corona discharge case is very different from the pattern of ordinary electric circuits, so it is interesting to investigate. Several previous studies involved the concept of Maxwell's equations on several physical case models such as coaxial cylinder, electrohydrodynamic, and the electric wind. In this study, we use a capacitance calculation model for positive dc corona discharge in air, especially in calculating the (I-V) current-voltage characteristics of an electrode configuration model, often referred to as capacitively coupled plasma (CCP). The configuration model comprises active and passive electrodes, with the active electrode in the form of a pentagonal with the sharp end (in the middle) facing downwards in an upright position. The passive electrode under the active electrode has a large rectangular shape in a lying place. This configuration model is named The Chisel Eye and Midpoint-Plane (CEM-P). The analytical calculation of the (I-V) characteristics uses the geometric properties of the active electrode, which will produce a large corona current flow at the pointed electrode. These properties in analytical calculation manifest with the emergence of the corona flow multiplication factor at the sharp active electrode’s integration boundary condition called the shape sharpness factor k. The Python GUI Programming simulation program makes graphic simulations, Standard Deviation (SD), t-tests, and calculating the factor k (fitting curve value) between numerical calculations and research data. The values of the SD, the t-tests, and the Percentage of tangent points meet the requirements for a high level of accuracy for the four CEM-P configuration models of the (I-V) characteristics simulation graph with the graph has a relatively large percentage of tangent points values (82.35% – 94.44%).

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2

Milovanović, Alenka, and Miroslav Bjekić. "Approximate Calculation of Capacitance of Lines with Multilayer Medium." Journal of Electrical Engineering 62, no. 5 (September 1, 2011): 249–57. http://dx.doi.org/10.2478/v10187-011-0040-0.

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Approximate Calculation of Capacitance of Lines with Multilayer Medium In this paper calculations of the capacitance per unit length of one or multilayer dielectric lines are presented. Special attention is given to the calculations of the capacitance per unit length of lines with rectangular cross sections, whose electrodes may be in different or the same layers of a two layer dielectric line. For the purpose of performing the above, several numerical methods are used and simple approximate expressions are proposed.

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3

Rahman, Md Mosaddequr, and Sazzadur Chowdhury. "Square Diaphragm CMUT Capacitance Calculation Using a New Deflection Shape Function." Journal of Sensors 2011 (2011): 1–12. http://dx.doi.org/10.1155/2011/581910.

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A new highly accurate closed-form capacitance calculation model has been developed to calculate the capacitance of capacitive micromachined ultrasonic transducers (CMUTs) built with square diaphragms. The model has been developed by using a two-dimensional polynomial function that more accurately predicts the deflection curve of a square diaphragm deformed under the influence of a uniform external pressure and also takes account of the fringing field capacitances. The model has been verified by comparing the model-predicted deflection profiles and capacitance values with experimental results published elsewhere and finite element analysis (FEA) carried out by the authors for different material properties, geometric specifications, and loading conditions. New model-calculated capacitance values are found to be in excellent agreement with published experimental results with a maximum deviation of 1.7%, and a maximum deviation of 1.5% has been observed when compared with FEA results. The model can help in improving the accuracy of the design methodology of CMUT devices and other MEMS-based capacitive type sensors built with square diaphragms.

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4

Wen, Baogang, Hongjun Ren, Pengfei Dang, Xu Hao, and Qingkai Han. "Measurement and calculation of oil film thickness in a ball bearing." Industrial Lubrication and Tribology 70, no. 8 (November 12, 2018): 1500–1508. http://dx.doi.org/10.1108/ilt-11-2016-0265.

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PurposeThe oil film thickness provides a key performance indicator of a ball bearing lubrication condition. This paper aims to propose an approach to calculate and measure the oil film thickness of the bearing.Design/methodology/approachOn a specially designed test rig, measurement of the capacitance is used to monitor the oil film thickness of ball bearing. A corrected film thickness formula taking account of the influences of non-Newtonian shear thinning and thermal is introduced to predict the oil film thickness of ball bearing. And then the film thickness distribution and the corresponding capacitances are calculated.FindingsMeasurement and calculation of oil film thickness in a ball bearing are carried out under various rotating speeds and external loads. By comparing the calculated capacitances with measured results, it can be concluded that the calculated results obtained by the amended film thickness formula are much closer to the test findings than the classical computed values according to Hamrock–Dowson.Originality/valueA new corrected film thickness formula is introduced in predicting oil film thickness of ball bearing and verified by the series of experiments according to capacitance method.

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5

KULVITIT, YOUTHANA. "ENERGY CAPACITY OF A VOLTAGE-DEPENDENT CAPACITOR FOR THE CALCULATION OF MOSFET's SWITCHING LOSS." Journal of Circuits, Systems and Computers 22, no. 09 (October 2013): 1340006. http://dx.doi.org/10.1142/s0218126613400069.

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Energy capacity of a voltage-dependent capacitor is investigated and defined. An equation for the calculation of energy capacity of the MOSFET's parasitic capacitance is formulated. The defined energy capacity of a voltage-dependent capacitance can be used to calculate switching loss of resonant switches by simply calculating the energy transferred into or retrieved from the MOSFET. The validity of the proposed formula is verified by computer simulation. The discrepancy between energy capacity of the MOSFET's parasitic capacitance calculated from the formulated equation and that calculated from the results of computer simulation is negligible. Computer simulation is also used to validate the proposed switching-loss calculation technique.

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6

Lu, Jun-Qiang, and X. G. Zhang. "Nucleotide Capacitance Calculation for DNA Sequencing." Biophysical Journal 95, no. 9 (November 2008): L60—L62. http://dx.doi.org/10.1529/biophysj.108.140749.

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7

Le, Cuong P., and Einar Halvorsen. "Capacitance calculation for electrostatic transducer applications." Journal of Intelligent Material Systems and Structures 24, no. 10 (December 14, 2012): 1176–86. http://dx.doi.org/10.1177/1045389x12470308.

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8

Wang, Hanfeng, Yaojiang Zhang, James L. Drewniak, Jun Fan, and Bruce Archambeault. "Capacitance Calculation for Offset Via Structures Using an Integral Approximation Approach Based on Finite Element Method." International Symposium on Microelectronics 2010, no. 1 (January 1, 2010): 000408–12. http://dx.doi.org/10.4071/isom-2010-wa2-paper3.

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A simple yet efficient approach is presented to extract the via-plane capacitances for an offset via structure. According to the integral approximation approach, the geometry of offset via is first divided into several segments with equally distributed angles from the origin. The two-dimensional FEM method for the concentric case is used for each segment based on its pad-stack parameters. Then, the final offset via-plane capacitance is approximated as the average of these ‘segmental’ capacitance values. Numerical examples demonstrated that the combined method has similar accuracy with a three-dimensional solver but it has much higher efficiency in both CPU time and memory cost.

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9

Chen, Meng Qi, Hua Wei Li, Fu Wei Chen, Shan Ying Li, Tian Zhi Cao, and Tao Wu. "Calculating Capacitance by the Mirror Image Method." Applied Mechanics and Materials 644-650 (September 2014): 3743–46. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3743.

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For quantitative analysis of impact of grounding capacitance on the traction power supply system, in this paper, two wires system as an example with the mirror image method concluded the calculation formula of two wires system to ground capacitance and partial capacitance. At last, the influence of grounding capacitance on the traction power supply system is given quantitatively to provide the more accurate basis for engineering calculation.

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10

Jos, Rik. "RF Monte Carlo calculation of power amplifier efficiency as function of signal bandwidth." International Journal of Microwave and Wireless Technologies 8, no. 2 (February 10, 2015): 125–33. http://dx.doi.org/10.1017/s175907871500015x.

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We propose a definition of the efficiency bandwidth for a power amplifier (PA) using a modulated signal as the signal bandwidth at which the amplifier efficiency has dropped to a level of 90% of the maximum efficiency at small bandwidth. We introduce a Monte Carlo method to calculate the efficiency bandwidth for some popular PA architectures. The method assumes a given modulated signal at the load. From this load signal the wave forms at the drains of the transistors are derived and the energy dissipation in the transistors can be calculated. Using idealized transistors with no output capacitance the maximum realizable efficiency bandwidth of an asymmetrical Doherty amplifier is 60%, which is much larger than that of an outphasing amplifier, which is 14%. More realistic transistors that include output capacitances, need a matching circuit with a high Q-value which decreases the efficiency bandwidth. Using output capacitance values typical for LDMOS transistors, the asymmetrical Doherty amplifier shows an efficiency bandwidth of about 400 MHz for a signal centered at 1 GHz. For a signal at 2 GHz the efficiency bandwidth is found to be 520 MHz. Due to the fixed values of the output capacitances the efficiency bandwidth does not scale with frequency.

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11

Li, Xiao Ming, Yong Zhong Pan, Hong Jun Li, Jie Shuai Ren, Po Hu, and Li Li Li. "Calculation of Capacitance Variation in Corona Cage." Applied Mechanics and Materials 740 (March 2015): 405–10. http://dx.doi.org/10.4028/www.scientific.net/amm.740.405.

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Corona cage is an important supplementary method for studying corona phenomenon, which is an indispensable for designing transmission lines. In this paper, the bundle conductors are chosen as research objects and the charge simulation method (CSM) is applied to build calculation model, using line electric charges to simulate bundle conductors, walls of corona cage and space charges. The method of tight coupling of electric field and potential is first introduced in corona processing, in which the Kaptzov hypothesis is directly applied to establish equations of charge - electric field and charge - electric potential. In addition, in order to analyze the capacitance value variation of corona cage when corona onset occurs, the emission, migration and composite process of space charges is simulated. Finally, 4, 8, 12 conductors in corona cage under different meteorological conditions are modeled, and the research results are analyzed. This research can also be applied to model corona cage and high voltage transmission lines at different voltage levels and different bundles under different meteorological conditions.

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12

Gerasimov, Ya S., V. V. Shorokhov, A. G. Maresov, E. S. Soldatov, and O. V. Snigirev. "Calculation of the mutual capacitance of nanoobjects." Journal of Communications Technology and Electronics 56, no. 12 (December 2011): 1483–89. http://dx.doi.org/10.1134/s106422691111009x.

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13

Malik, N. H., and A. A. Al-Arainy. "Capacitance Calculation of Three Core Belted Power Cables." International Journal of Electrical Engineering & Education 25, no. 1 (January 1988): 27–32. http://dx.doi.org/10.1177/002072098802500107.

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Based on charge simulation technique for solving the electrostatic field problems, a method to compute the capacitance of three core belted power cables is discussed. It is shown that very accurate capacitance calculations are possible if an appropriate number of simulating charges are used. Furthermore, the factors which influence the accuracy of such computations are analyzed.

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14

Kim, Chan-Ho, Sung-Bae Jun, Han-Joon Yoon, Nam-Ho Kim, Ho-Chang Jung, Rae-Eun Kim, and Sang-Yong Jung. "Calculation of Parasitic Capacitance to Analyze Shaft Voltage of Electric Motor with Direct-Oil-Cooling System." Processes 10, no. 8 (August 5, 2022): 1541. http://dx.doi.org/10.3390/pr10081541.

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In modern electric vehicles, electrical failure has become a critical problem that reduces the lifetime of traction motors. Moreover, traction motors with high-voltage and high-speed systems for a high power density have been aggravating the shaft voltage problems. This study identifies that direct-oil-cooling systems exacerbate this problem. To address this, an analytical method for calculating parasitic capacitance is proposed to determine the effects of cooling oil in a traction motor with a direct-oil-cooling system. Capacitance equivalent circuits are configured based on whether the slot is submerged in the cooling oil. In addition, an electric field decomposition method is applied to analyze the distortion of the electric field by the structure of the conduction parts in the motor. The results indicate that the parasitic capacitances of the traction motor are increased by the influence of the cooling oil resulting in an increase in the shaft voltage.

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15

Maier, T., D. Droste, and M. Siegel. "Best usage of free-space capacitors in ASIC regulators." Advances in Radio Science 11 (July 4, 2013): 125–30. http://dx.doi.org/10.5194/ars-11-125-2013.

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Abstract. In this work we examine how to improve the performance of voltage regulators in application specific integrated circuits (ASICs) by placing capacitors into free layout space. The problem arising after layout, when there are areas not covered by functional elements, is where to connect the free-space capacitors (FSCs), as they can be connected to the input or the output net of a voltage regulator. Therefore we designed a testbench for mathematical calculations and one for simulations to identify the influence of a capacitance connected at these certain positions. We mainly focused on PSR analysis while not losing sight of transient effects. The results of calculation and simulation illustrate that the best solution is to split the capacitance half by half to both possible nets if no output capacitance was installed during design. Otherwise a ratio of one to one for input capacitance to output capacitance has to be set up for best performance.

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16

Le, Jia-Bo, Qi-Yuan Fan, Jie-Qiong Li, and Jun Cheng. "Molecular origin of negative component of Helmholtz capacitance at electrified Pt(111)/water interface." Science Advances 6, no. 41 (October 2020): eabb1219. http://dx.doi.org/10.1126/sciadv.abb1219.

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Electrified solid/liquid interfaces are the key to many physicochemical processes in a myriad of areas including electrochemistry and colloid science. With tremendous efforts devoted to this topic, it is unexpected that molecular-level understanding of electric double layers is still lacking. Particularly, it is perplexing why compact Helmholtz layers often show bell-shaped differential capacitances on metal electrodes, as this would suggest a negative capacitance in some layer of interface water. Here, we report state-of-the-art ab initio molecular dynamics simulations of electrified Pt(111)/water interfaces, aiming at unraveling the structure and capacitive behavior of interface water. Our calculation reproduces the bell-shaped differential Helmholtz capacitance and shows that the interface water follows the Frumkin adsorption isotherm when varying the electrode potential, leading to a peculiar negative capacitive response. Our work provides valuable insight into the structure and capacitance of interface water, which can help understand important processes in electrocatalysis and energy storage in supercapacitors.

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17

Liang, Da, Kunlun Zhang, Qilong Jiang, and Ying Wang. "A Novel Analytic Method to Calculate the Equivalent Stray Capacitance of the Low-Speed Maglev Train’s Suspension Electromagnet." Energies 13, no. 20 (October 19, 2020): 5469. http://dx.doi.org/10.3390/en13205469.

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The suspension electromagnet (SEM) is one of the most critical components of the low-speed maglev train to achieve the stable suspension and non-contact operation with the track. Therefore, it is valuable for optimizing the maglev system to study the characteristics of the SEM. This paper proposes a novel analytic method to calculate the equivalent stray capacitance of the SEM efficiently. It considers the capacitances inside the winding (turn to turn and layer to layer) and between the winding and core. Firstly, utilizing the compensation analytic method (CAM) calculates the static capacitances to reduce the calculation error, and the results of the CAM have significant improvement comparing with that of the traditional analytic method (TAM). Secondly, the analytical formula of the core floating potential is derived based on the partial capacitance theory, which has a 2.1% relative error to the finite element method (FEM). Finally, the experiment results of the SEM of a test rig prove the accuracy and efficiency of the proposed method.

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18

Tezuka, Toshikazu, and Kazunori Sato. "An Improved Calculation for Differential Voltage Capacitance Spectroscopy." Japanese Journal of Applied Physics 28, Part 2, No. 10 (October 20, 1989): L1731—L1733. http://dx.doi.org/10.1143/jjap.28.l1731.

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19

Liu, Xiaojing, Youhua Wang, Jianguo Zhu, Youguang Guo, Gang Lei, and Chengcheng Liu. "Calculation of Capacitance in High-Frequency Transformer Windings." IEEE Transactions on Magnetics 52, no. 7 (July 2016): 1–4. http://dx.doi.org/10.1109/tmag.2016.2522976.

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20

Gavrilakis, A., A. P. Duffy, K. G. Hodge, and A. J. Willis. "Partial Capacitance Calculation for Shielded Twisted Pair Cables." IEEE Transactions on Electromagnetic Compatibility 46, no. 2 (May 2004): 299–302. http://dx.doi.org/10.1109/temc.2004.826883.

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21

Lee, Bora, Choong-Ki Lee, Seungwu Han, Jaichan Lee, and Cheol Seong Hwang. "First-principles calculation of capacitance including interfacial effects." Journal of Applied Physics 103, no. 2 (January 15, 2008): 024106. http://dx.doi.org/10.1063/1.2832413.

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22

Ma, Yu Quan, Li Hong Zhang, Shu Fen Han, and Zhi Peng Lin. "Parameters Design of Main Circuit of AC Constant Voltage Power Supply Based on Dual Directional Reversible PWM Control." Advanced Materials Research 383-390 (November 2011): 5771–77. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5771.

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The constant voltage power supply with dual directional reversible PWM compensation has merits of high precision, high efficiency, small volume, and so on. To ensure the quality of supply, it is important to fix the value of inductance, capacitance in main circuit. From the angle of filtering, and through analysis of the circuit working, detailed formulas of the inductance and capacitance calculation are given and an example of it is given too. In parameters calculation, to reduce the volume, the filter inductance is taken a smaller value but the capacitance is taken a greater value; the DC smoothing capacitance should be chosen according to the amplitude limit of DC voltage rising in inversion, and should be taken as great as possible to maintain voltage stabilizing precision.

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23

Šetrajčić, Jovan P., Stevo K. Jaćimovski, and Vjekoslav D. Sajfert. "Phonon contribution to heat capacitance of nanolayered crystalline structures." Modern Physics Letters B 29, no. 04 (February 10, 2015): 1550008. http://dx.doi.org/10.1142/s0217984915500086.

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The paper presents the innovated method of two-time dependent Green's functions applied to the bounded and translational perturbed systems. Film-structures and superlattices were analyzed by employing the phonon spectra for the calculation of relevant thermodynamic characteristics. Free energy and the internal energy of the system were found as well as the temperature behavior of layered structures. Heat capacitances of these nanostructures were compared to bulk ones. It was shown that heat capacitances of nanolayered structures in low-temperature region were higher than the same quantities of the corresponding bulk sample. In the middle and the highest temperature region, temperature behavior was inverse: heat capacitance of layered structures was lower than of the corresponding bulk ones. The consequences were discussed with relation to the (super)conductive properties of nanomaterials.

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24

Wu, Feng, Chen Yao, and Yi Bing Xie. "Electrolyte-Dependent Capacitance of Titanium Dioxide Nanotube Array Electrode Substrate." Journal of Nano Research 75 (September 21, 2022): 71–80. http://dx.doi.org/10.4028/p-72934g.

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The anatase titanium dioxide nanotube array (TiO2 NTA) with short and independent nanotube film structure is applied as stable metal oxide electrode substrate. The influence of different proton acid electrolytes is fully investigated on the electrical double-layer capacitance. The anatase TiO2 NTA electrode substrate conducts reversible protonation-deprotonation process of dissociation hydrogen ion and electrostatic adsorption-desorption process of equilibrium anion in the cycling charge-discharge process. The reversible properties could be well proved by highly symmetric characteristic of positive-negative sweeping current and charge-discharge potential. The protonated TiO2 NTA electrode substrate reveals cyclic voltammetry-based capacitances of 0.147 and 0.124 mF cm-2, galvanostatic charge-discharge-based capacitances of 0.167 and 0.148 mF cm-2 when similar dissociation proton concentration is maintained in 1.0 M H2SO4 and 1.0 M HCl. The TiO2/H2SO4 exhibits similar capacitance enhancement ratio of 1.19 and 1.13 in comparison with of the TiO2/HCl. The corresponding electrical double-layer capacitance at the same dissociation proton condition is mostly dependent on the electrostatic interaction between the protonated TiO2 and equilibrium anions in different proton acid electrolytes rather than anion diffusion. The theoretical simulation calculation reveals that TiOOH+-HSO4- shows lower interaction interface energy and higher total densities of states than TiOOH+-Cl-. Accordingly, TiO2/H2SO4 conducts more feasible protonation and electrostatic adsorption process rather than TiO2/HCl, contributing to its superior electrical double-layer capacitance.

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25

Wang, Hanfeng, Siming Pan, Jingook Kim, Albert E. Ruehli, and Jun Fan. "Capacitance Calculation for Via Structures Using an Integral Equation Method Based on Partial Capacitance." IEEE Transactions on Components, Packaging and Manufacturing Technology 3, no. 12 (December 2013): 2134–46. http://dx.doi.org/10.1109/tcpmt.2013.2272323.

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26

Zong, Wei, and Yu Shan Zhang. "Mutual Capacitance Element." Applied Mechanics and Materials 448-453 (October 2013): 2105–8. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2105.

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In order to realize the integration of electronic circuits and avoid the electromagnetic interference between mutual inductance components and periphery circuit, the paper put forward a new kind of coupling element-mutual capacitance components, which were dual with mutual inductance components, according to the duality principle and the gyrator application theory. First of all, the paper used the basic electrical components-operational amplifier, resistance and capacitor to set up the circuit implementation model of mutual capacitance component, and then selected device parameters to execute theory calculation. On the basis of the previous step, a simulation software-PSpice, was used to simulate the model. Finally, comparison of two different groups of simulation data showed the correctness of the circuit model and the feasibility of the mutual capacitance component.

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27

Connor, Paula, Jona Schuch, Bernhard Kaiser, and Wolfram Jaegermann. "The Determination of Electrochemical Active Surface Area and Specific Capacity Revisited for the System MnOx as an Oxygen Evolution Catalyst." Zeitschrift für Physikalische Chemie 234, no. 5 (May 26, 2020): 979–94. http://dx.doi.org/10.1515/zpch-2019-1514.

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AbstractIn the last decades several different catalysts for the electrochemical water splitting reaction have been designed and tested. In so-called benchmark papers they are compared with respect to their efficiency and activity. In order to relate the different catalyst to each other the definition of well-defined procedures is required. Two different methods are mainly used: Either the normalization with respect to the geometric surface area or to the catalyst loading. Most often only one of these values is available for a sample and the other one cannot be estimated easily. One approach in electrocatalysis is to determine the Helmholtz double layer capacitance (DLC) and deduce the electrochemical active surface area (ECSA). The DLC can be obtained from two different methods, either using differential capacitance measurement (DCM) or impedance spectroscopy (EIS). The second value needed for the calculation of the ECSA is the specific capacitance, which is the capacitance for a perfectly flat surface of given catalyst material. Here, we present the determination of the different capacitance values using manganese oxide as the exemplary model for the oxygen evolution reaction (OER). We determine the capacitance by DCM and EIS to calculate the ECSA using literature values for the specific capacitance. The obtained values are comparable from the two methods, but are much larger than the surface areas obtained by atomic force microscopy. Therefore, we consider the possibility of using the measured AFM area together with the Helmholtz capacitance to determine the specific capacitances for this material class. The comparison of these results with literature values illustrates the actual limits of the ECSA method, which will be discussed in this paper.

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28

ROTKIN, SLAVA V., VAISHALI SHRIVASTAVA, KIRILL A. BULASHEVICH, and N. R. ALURU. "ATOMISTIC CAPACITANCE OF A NANOTUBE ELECTROMECHANICAL DEVICE." International Journal of Nanoscience 01, no. 03n04 (June 2002): 337–46. http://dx.doi.org/10.1142/s0219581x02000279.

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An atomistic capacitance is derived for a single-wall carbon nanotube in a nano-electromechanical device. Multi-scale calculation is performed using a continuum model for the geometrical capacitance, and statistical and quantum mechanical approaches for the quantum capacitance of the nanotube. The geometrical part of the capacitance is studied in detail using full three-dimensional electrostatics. Results reported in this paper are useful for compact modeling of the electronic and electromechanical nanotube devices.

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29

Safonova, Galyna, and Elena D. Vinogradova. "RIGOROUS APPROACH TO CALCULATION OF CAPACITANCE IMAGES OF METALLIC SAMPLES FOR USE IN CAPACITANCE MICROSCOPY." Progress In Electromagnetics Research B 55 (2013): 383–99. http://dx.doi.org/10.2528/pierb13091002.

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30

Barke, E. "Line-to-ground capacitance calculation for VLSI: a comparison." IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 7, no. 2 (1988): 295–98. http://dx.doi.org/10.1109/43.3160.

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31

Chowdhuri, P. "Calculation of Series Capacitance for Transient Analysis of Windings." IEEE Power Engineering Review PER-7, no. 1 (January 1987): 45–46. http://dx.doi.org/10.1109/mper.1987.5527311.

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Chowdhuri, P. "Calculation of Series Capacitance Eor Transient Analysis of Windings." IEEE Transactions on Power Delivery 2, no. 1 (1987): 133–39. http://dx.doi.org/10.1109/tpwrd.1987.4308083.

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33

Xikui, Ma. "Calculation of capacitance for rectangular coaxial strip transmission line." Journal of Electronics (China) 4, no. 2 (April 1987): 155–60. http://dx.doi.org/10.1007/bf02778802.

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34

Yan, H., F. Q. Shao, and S. Wang. "Fast calculation of sensitivity distributions in capacitance tomography sensors." Electronics Letters 34, no. 20 (1998): 1936. http://dx.doi.org/10.1049/el:19981176.

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35

Das, B. N., and B. Chakrabarty. "Calculation of the electrical capacitance of a truncated cone." IEEE Transactions on Electromagnetic Compatibility 39, no. 4 (1997): 371–74. http://dx.doi.org/10.1109/15.649838.

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36

Kuznetsov, Andrei, and Alexander Sipin. "Monte Carlo Algorithms for the Extracting of Electrical Capacitance." Mathematics 9, no. 22 (November 17, 2021): 2922. http://dx.doi.org/10.3390/math9222922.

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We present new Monte Carlo algorithms for extracting mutual capacitances for a system of conductors embedded in inhomogeneous isotropic dielectrics. We represent capacitances as functionals of the solution of the external Dirichlet problem for the Laplace equation. Unbiased and low-biased estimators for the capacitances are constructed on the trajectories of the Random Walk on Spheres or the Random Walk on Hemispheres. The calculation results show that the accuracy of these new algorithms does not exceed the statistical error of estimators, which is easily determined in the course of calculations. The algorithms are based on mean value formulas for harmonic functions in different domains and do not involve a transition to a difference problem. Hence, they do not need a lot of storage space.

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37

Chuen, J., D. Y. Li, Y. Tian, and L. X. Shao. "Self-Consistent Calculation on the Time-Dependent Electrons Transport Properties of a Quantum Wire." Journal of Nanomaterials 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/842937.

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Responses of a quantum wire (QW) connected with wide reservoirs to time-dependent external voltages are investigated in self-consistent manner. Distributions of the internal potential and the induced charge density, capacitance, and conductance are calculated. Results indicate that these physical quantities depend strongly on the Fermi energy of systems and the frequency of external voltages. With the increase of the Fermi energy, capacitance and conductance show some resonant peaks due to the open of the next higher quantum channels and the oscillations related to the longitudinal resonant electron states. Frequency-dependent conductance shows two different responses to the external voltages, inductive-like and capacitive-like; and the peaks structure of capacitance is related to the plasmon-like excitation in mesoscopic conductor.

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Wu, Guozeng, and Quanlin Dong. "The establishment and simulation of bidirectional Cockcroft-Walton circuit model." Circuit World 43, no. 4 (November 6, 2017): 152–55. http://dx.doi.org/10.1108/cw-11-2016-0057.

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Purpose The purpose of this paper is to improve the stability of high voltage DC power supply and reduce the ripple. Design/methodology/approach The study was conducted using the simulation analysis model and numerical calculation. Findings By increasing the output arm capacitance, the expression of ripple and times of the output arm capacitance and the auxiliary arm capacitance is derived. The output ripple is determined by the value of the output arm capacitance. Finally, the correctness of the method and the formula are verified using circuit simulation. Originality value This paper presents a method to improve the power supply stability.

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Ma, Min, Min Hou, Cai Xia Zhang, and Lu Jun Han. "The Optimal Design of ECT Electrodes Array Based on APDL." Applied Mechanics and Materials 130-134 (October 2011): 3740–45. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3740.

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A model of Electrical Capacitance Tomography (ECT) electrodes array was established by ANSYS Parameter Design Language (APDL). A analysis platform of ECT is developed through the macro feature of APDL for the function of interaction. Based on this fast and approximate calculation of capacitance, optimal design will be put forward more conveniently.

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Pourmirzaei Deylami, Fazel, and Ahmad Darabi. "Conceptual method for the detailed analytical calculation of capacitance matrix elements in variable capacitance synchronous machines." IET Electric Power Applications 15, no. 5 (March 6, 2021): 513–27. http://dx.doi.org/10.1049/elp2.12027.

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Li, Xin Xin, Wen Wang, and Jian Ping Yu. "Structural Optimization for Direct-Decoupling Planar Capacitive Sensor." Advanced Materials Research 139-141 (October 2010): 2271–74. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2271.

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To optimize the structure of posed direct-decoupling planar capacitive sensor (PCS), methods for capacitance and sensitivity computation are studied, and the structural optimization is established. Firstly, four methods are compared with to find a suitable analytical method for the calculation of posed PCS capacitance and sensitivity. Then, electrostatic field equation method are applied and under the condition of given sensitivity, PCS structural parameters, i.e. the length of side and the number of plates is optimized. Computation results indicate that electrostatic field equation method is available for the calculation of capacitance and sensitivity on one hand, and on the other hand, when the length of side of PCS plate is twice the gap of two parallel part (l≈2d )and the number of plates is seven (N=7), PCS can meet sensitivity requirement and take up the smallest dimension.

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Li, Zheng Hui, Qing Zhi Zhai, and Wen Li. "Research on Stand-Alone PMSG Voltage Stabilizing Method Based on Series Resonance." Advanced Materials Research 614-615 (December 2012): 1221–25. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1221.

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Stand-alone PMSG has to face voltage fluctuation problems. This paper proposes a kind of voltage stabilizing method based on series resonance in the armature loop and analyses the principle of stabilizing voltage and expounds on the calculation method of series capacitance. Taking a 5kVA three-phase PMSG as an example, we have done the model calculation and simulation, and steady-state analysis results verify the effectiveness of this method. Transient analysis results show that the reasonable selection of capacitance in series has good effects both on limiting short circuit current and avoiding demagnetization of the permanent magnet materials.

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Waindok, Andrzej, and Paweł Piekielny. "Transient Analysis of a Railgun with Permanent Magnets Support." Acta Mechanica et Automatica 11, no. 4 (December 1, 2017): 302–7. http://dx.doi.org/10.1515/ama-2017-0046.

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Abstract The calculation and measurement results of transients for an electrodynamic accelerator with permanent magnet support have been presented in this paper. The calculations have been made using the magnetostatic model in the Maxwell software, as well as using a Matlab/Simulink transient model. The waves of mechanical parameters (projectile velocity and acceleration, force) and electric ones (excitation current and capacitor voltage) have been analyzed for different supply conditions (voltage value, capacitance). The efficiency and projectile energy have been studied as well. The mathematical models have been verified experimentally using the original laboratory stand. A good conformity between calculation and measurement results has been obtained.

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Han, Zhen, Xiaobing Zhang, Bing Yan, Liang Qiao, and Zhihua Li. "Methods on the Determination of the Circuit Parameters in an Underwater Spark Discharge." Mathematical Problems in Engineering 2022 (May 18, 2022): 1–9. http://dx.doi.org/10.1155/2022/7168375.

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We constructed an underwater discharge system to conduct a number of experiments. Considering the constant resistance of the plasma channel, we got an analytic expression for the current containing unknown parameters on the basis of the Kirchhoff voltage law. Therefore, we are required to determine the total circuit resistance R with the measured current data in hand. Three methods are employed to get this job done, namely, nonlinear least squares with three variables (NLS-TV), nonlinear least squares with a single variable (NLS-SV), and waveform calculation method (WCM). The Levenberg–Marquardt (L-M) algorithm and particle swarm optimization (PSO) algorithm are employed in NLS-TV and NLS-SV, and the root mean square error (RMSE), as well as an improved cosine similarity (ICS), was selected to evaluate the performance of algorithms. The results show that NLS-TV gives an optimal solution with the combination of the PSO algorithm and L-M algorithm. Then, by calculation, R = 1.3195 Ω , C = 0.56865 μF, and L = 17.172 μH. RMSE and ICS between fitted current data and measured one are 43.9689 and 0.9947, respectively. NLS-SV gives a satisfying solution either by PSO or by L-M, yet it needs information of angular frequency from the measured current waveform and the total inductance C . In this case, we get R = 1.3115 Ω , L = 16.969 μH, RMSE = 48.0883, and ICS = 0.9967. As for WCM, it is completely dependent on the measured current waveform and the total inductance C . The corresponding values of R and L are 1.2463 Ω and 16.993 μH. Also, we get RMSE = 52.1902 and ICS = 0.9728. For NLS-SV and WCM, the needed total capacitance during calculation is determined using the computed capacitance by NLS-TV. If the energy storage capacitance is used as the total capacitance, the obtained solution is frustrating. Therefore, independent use of NLS-SV or WCM demands a precise capacitance of the total circuit measured by an RLC meter. We also draw a conclusion that ignoring the capacitance of other parts of the circuit is incorrect and will lead to an enormous error during calculation.

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Xiang, Chuan, Xinwei Chen, Hongge Zhao, Zejun Ren, and Guoqing Zhao. "Studying the Effect of Stray Capacitance on the Measurement Accuracy of the CVT Based on the Boundary Element Method." Complexity 2021 (May 30, 2021): 1–11. http://dx.doi.org/10.1155/2021/1155443.

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The capacitive voltage transformer (CVT) is a special measuring and protecting device, which is commonly applied in high-voltage power systems. Its measurement accuracy is affected seriously by the stray capacitances of the capacitance voltage divider (CVD) to ground and other charged parts. In this study, based on the boundary element method, a mathematical model was established firstly to calculate the stray capacitance. Then, the voltage distribution of the CVD was obtained by the CVD’s equivalent circuit model. Next, the effect of stray capacitance on the voltage distribution and the voltage difference ratio (VDR) of CVD was analysed in detail. We finally designed three types of shield and optimized their structure parameters to reduce VDR. The results indicated that the average deviation rate between calculated and experimental measured voltages is only 0.015%; that is to say, the method has high calculation precision. The stray capacitance of the CVD to ground is far larger than that of the CVD to the high-voltage terminal. It results in the inhomogeneous distribution of voltage and the increase of VDR. For the test CVT, its VDR exceeds the requirement of class 0.2. Among all of the three types of shield, the C type reduced the VDR of the test CVT the most. After optimizing the structure parameters of C-type shield, the VDR is further reduced to 0.08%. It is not only in accord with the requirement of class 0.2 but also has an adequate margin.

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Chen, Yong, and Jian Sheng Yuan. "Calculation of Single Conductor Capacitance by Estimating the Electrostatic Field." Advanced Materials Research 542-543 (June 2012): 1242–47. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.1242.

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The capacitance between two terminals of a single conductor working with time-dependent signals is defined by the amount of energy stored in the electric field outside the conductor. A simple approach for calculating the capacitance is presented in this paper, which only needs the computation of an electrostatic field. The approach is derived based on two assumptions, (1) the distribution of potentials on the conductor surface is almost the same, created by a time-dependent current and a direct current flowing in the conductor, (2) the distribution of the potential created by a direct current in the conductor can be modeled by an electrostatic field, in which the conductor is replaced by a dielectric with high permittivity. The approach is only suitable for low-frequency situations, where the displacement current and the inductive electric field can be disregarded.

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Racec, P. N., and Ulrich Wulf. "Small-Signal Circuit Elements of MIS-Type Nanostructures." Solid State Phenomena 121-123 (March 2007): 549–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.549.

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Starting from a mean field calculation for the static capacitance of a MIS-nanostructure with a near back gate [P.N. Racec, E. R. Racec and U. Wulf, Phys. Rev. B 65, 193314, (2002)] we develop an approach to determine the equivalent small-signal circuit. The analyzed system has an open character, taken into account in the Landauer-Büttiker formalism. The Coulomb interaction is treated in Hartree approximation. Consistent with our static calculations we determine the charge-charge correlation function in the random phase approximation to find the ac-admittances. The small-signal circuit consists of a voltage-dependent capacitance and a resistance in series. Beyond a characteristic frequency c ν they become frequency dependent. The characteristic frequency is given by the life time of specific resonance which develops in the system.

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Du, Ming-Xing, Yuxiao Zhang, Hongbin Wang, Ye Tian, Ziwei Ouyang, and Ke-Xin Wei. "AN IMPROVED CALCULATION METHOD FOR STATIC CAPACITANCE IN INDUCTOR WINDINGS." Progress In Electromagnetics Research C 104 (2020): 25–36. http://dx.doi.org/10.2528/pierc20051203.

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Ymeri, H., B. Nauwelaers, and K. Maex. "On the two-dimensional capacitance calculation of multiconductor multilayered interconnects." Annales Des Télécommunications 56, no. 9-10 (September 2001): 550–59. http://dx.doi.org/10.1007/bf03008832.

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Ha, Heng Xu, Xiao Liu, and Xi Tong Hu. "The Calculation of Earth Capacitance Based on Least Square Method." Advanced Materials Research 433-440 (January 2012): 6028–32. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.6028.

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The grounding capacitive current is one of the most important parameters of ungrounded neutral system. Usually this parameter is obtained with the method of additional capacitor or metal grounding. However, the former is complicated and the additional capacitor has negative effects on measurement results, and the later is dangerous when used in testing. In view of that, the paper proposes a new method to calculate grounding capacitance current based on the data of single-phase-grounding faults in power system with indirectly earthed neutral. This method reduces the error by using the least-square method .The ATP simulation results show that this method is accurate basically.

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