EXCITATION OF A PULSE ELECTROMECHANICAL CONVERTER OF ELECTRODYNAMIC TYPE FROM A TWO-SECTION CAPACITOR ENERGY STORAGE

A mathematical model of a pulsed electromechanical converter (PEC) of electrodynamic type has been developed, in which the solutions of the equations are presented in a recurrent form, which, when numerically implemented, allows taking into account the interrelated electrical, magnetic, mechanical and thermal processes and their nonlinear parameters. While maintaining the total energy of the pulsed source, the influence of the distribution of energy between the two sections of the capacitive energy storage (CES) and the voltage at which the additional section of the CES is connected was established. When operating in an accelerating mode, the largest amplitude of electrodynamic forces (EDF) and maximum speed occur in the basic version of the PEC, which is excited only from the main section of the CES, and the most effective is the PEC with the smallest capacity of the main section of the CES, and its maximum value is 2.61 higher than for the basic version of the PEC. When operating in the shock-power mode, compared with the basic version of the PEC, the amplitude of the EDF decreases. The most effective is the PEC with the smallest capacity of the main section of the CES, and its maximum value is 5.17 higher than that of the basic version of the PEC. Experimental studies of the PEC in the shock-power mode established that the oscillograms of the voltage of the CES and the current of the PEC correspond to the calculated characteristics, and their main indicators are consistent with each other with an accuracy of 5-7%. References 16, figures 6.

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INFLUENCE OF AN EXCITATION SOURCE ON THE POWER INDICATORS OF A LINEAR PULSE ELECTROMECHANICAL CONVERTER OF INDUCTION TYPE

Tekhnichna Elektrodynamika ◽

10.15407/techned2021.03.028 ◽

2021 ◽

Vol 2021 (3) ◽

pp. 28-36

Author(s):

V.F. Bolyukh ◽

◽

I.S. Shchukin ◽

◽

...

Keyword(s):

Voltage Source ◽

Capacitive Energy Storage ◽

Maximum Value ◽

Unipolar Pulse ◽

Induction Type ◽

Linear Pulse ◽

Voltage Frequency ◽

Power Mode ◽

Electromechanical Converter ◽

Alternating Voltage

The purpose of the article is to evaluate the efficiency of an induction-type linear pulse electromechanical converter (LPEC) when operating in shock-power mode and excitation from an alternating voltage source (AVS) in comparison with excitation from a capacitive energy storage (CES). A mathematical model of an induction-type LPEC has been developed both when excited by a unipolar pulse from a CES and from an AVS using lumped parameters of the windings, which takes into account the interrelated electromagnetic, mechanical and thermal processes. It has been found that when the LPEC is excited from the AVS with a voltage frequency of 50 Hz, the electrodynamic force takes on a periodic decaying character with a significant prevalence of positive components of forces over negative ones. The maximum value of the force is much less, and the value of its impulse is much greater than in the LPEC, excited from the CES. With an increase in the frequency of the AVS voltage from 50 to 150 Hz, the highest value of the current density of the inductor winding decreases, and in the armature winding it increases. The greatest values of force and impulse of force are realized at a voltage frequency of 150 Hz. With an increase in the AVS frequency, the relative indicator of the efficiency of the LPEC increases. References 15, figures 4.

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Air activation of charcoal monoliths for capacitive energy storage

RSC Advances ◽

10.1039/d1ra02192c ◽

2021 ◽

Vol 11 (25) ◽

pp. 15118-15130

Author(s):

Yu Ma ◽

Hanqin Liang ◽

Jinwei Yin ◽

Dongxu Yao ◽

Yongfeng Xia ◽

...

Keyword(s):

Energy Storage ◽

Electrochemical Capacitor ◽

Activation Mechanism ◽

Capacitive Energy Storage ◽

Waste Wood

Charcoal monoliths derived from waste wood were activated with air for the application of electrochemical capacitor electrodes and an insight was given into the activation mechanism.

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Nitrogen-doped graphene with high nitrogen level via a one-step hydrothermal reaction of graphene oxide with urea for superior capacitive energy storage

RSC Advances ◽

10.1039/c2ra01367c ◽

2012 ◽

Vol 2 (10) ◽

pp. 4498 ◽

Cited By ~ 534

Author(s):

Li Sun ◽

Lei Wang ◽

Chungui Tian ◽

Taixing Tan ◽

Ying Xie ◽

...

Keyword(s):

Graphene Oxide ◽

Energy Storage ◽

Hydrothermal Reaction ◽

High Nitrogen ◽

Capacitive Energy Storage ◽

Nitrogen Doped ◽

High Nitrogen Level ◽

Nitrogen Doped Graphene ◽

Doped Graphene ◽

One Step

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SMIB stability enhancement using capacitive energy storage and PID based on ant colony optimization

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/575/1/012241 ◽

2020 ◽

Vol 575 ◽

pp. 012241

Author(s):

A M S Yunus ◽

M R Djalal ◽

Y S Akil

Keyword(s):

Energy Storage ◽

Ant Colony Optimization ◽

Ant Colony ◽

Capacitive Energy Storage ◽

Stability Enhancement

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Boosting up the capacitive energy storage performances of lead-free ceramics via grain engineering for pulse power applications

Ceramics International ◽

10.1016/j.ceramint.2020.08.293 ◽

2021 ◽

Vol 47 (2) ◽

pp. 2869-2873

Author(s):

Yang Jin ◽

Jinfeng Wang ◽

Lin Jiang ◽

Yao Yao ◽

Yangjue Huang ◽

...

Keyword(s):

Energy Storage ◽

Pulse Power ◽

Lead Free ◽

Capacitive Energy Storage ◽

Lead Free Ceramics ◽

Grain Engineering

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Two-dimensional perovskite LaNiO3 nanosheets with hierarchical porous structure for high-rate capacitive energy storage

Electrochimica Acta ◽

10.1016/j.electacta.2017.11.099 ◽

2017 ◽

Vol 258 ◽

pp. 561-570 ◽

Cited By ~ 28

Author(s):

Zijiong Li ◽

Weiyang Zhang ◽

Haiyan Wang ◽

Baocheng Yang

Keyword(s):

Energy Storage ◽

Porous Structure ◽

High Rate ◽

Two Dimensional ◽

Hierarchical Porous Structure ◽

Capacitive Energy Storage ◽

Hierarchical Porous

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Hierarchically porous carbon by activation of shiitake mushroom for capacitive energy storage

Carbon ◽

10.1016/j.carbon.2015.05.056 ◽

2015 ◽

Vol 93 ◽

pp. 315-324 ◽

Cited By ~ 255

Author(s):

Ping Cheng ◽

Shuangyan Gao ◽

Peiyu Zang ◽

Xiaofan Yang ◽

Yonglong Bai ◽

...

Keyword(s):

Energy Storage ◽

Porous Carbon ◽

Shiitake Mushroom ◽

Capacitive Energy Storage ◽

Hierarchically Porous

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Combining Nature-Inspired, Graphene-Wrapped Flexible Electrodes with Nanocomposite Polymer Electrolyte for Asymmetric Capacitive Energy Storage

Advanced Energy Materials ◽

10.1002/aenm.201600813 ◽

2016 ◽

Vol 6 (19) ◽

pp. 1600813 ◽

Cited By ~ 31

Author(s):

Jiayong Tang ◽

Ping Yuan ◽

Chuanlin Cai ◽

Yanbao Fu ◽

Xiaohua Ma

Keyword(s):

Energy Storage ◽

Polymer Electrolyte ◽

Capacitive Energy Storage ◽

Flexible Electrodes ◽

Nanocomposite Polymer ◽

Nanocomposite Polymer Electrolyte

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ANALYSIS OF THE ERROR IN DETERMINING THE EQUIVALENT SIZE OF A DEFECT BY THE STANDARDLESS METHOD DURING ULTRASONIC TESTING

Kontrol Diagnostika ◽

10.14489/td.2021.04.pp.050-057 ◽

2021 ◽

pp. 50-57

Author(s):

A. N. Kireev ◽

M. A. Kireeva

Keyword(s):

Relative Error ◽

High Reliability ◽

Ultrasonic Method ◽

Experimental Studies ◽

Standard Samples ◽

Defect Identification ◽

Identification Method ◽

Maximum Value ◽

Software Product ◽

The Relationship

The article provides a review and analysis of the defect identification method for determining the size of discontinuities when diagnosing various machine parts and units by the manual ultrasonic method. This method makes it possible to determine the equivalent size of discontinuities of various types without using standard samples of an enterprise: point planar and volumetric; extended planar and volumetric. The method is based on the use of the relationship between the amplitude and time characteristics of the echo signal from the discontinuity and the backside signal in the object being diagnosed and the equivalent size of the discontinuity. The article presents the mathematical apparatus for the implementation of this method. Also presented is a software product that allows you to automate calculations when using this defect identification method. The article contains experimental studies of the method for determining the equivalent dimensions of discontinuities of various types, which have shown its high reliability. The maximum value of the relative error in determining the equivalent size of a point planar discontinuity was 2.867 %. The maximum value of the relative error in determining the equivalent size of a point volumetric discontinuity was 1.986 %. The maximum value of the relative error in determining the transverse equivalent size of an extended planar discontinuity was 0.667 %. The maximum value of the relative error in determining the transverse equivalent size of an extended volumetric discontinuity was 1.95 %.

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