Utilization Optimization of Capacitive Pulsed Power Supply in Railgun

Cao, Genrong; Xiang, Hongjun; Qiao, Zhiming; Liang, Chunyan; Yuan, Xichao; Wang, Jin; Liu, Bin

doi:10.3390/en15145051

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Indeed, the excitation current of the railgun is generally ad justed to the approximate square waveform to accelerate the armature stably. The flat-top current is formed by many continuous current pulses [18]. The typical excitation curren waveform of the railgun is shown in Figure 11.…”

Section: Solution Of the Residual Capacitive Energymentioning

confidence: 99%

Fault Mechanism and Improvement in the Augmented Railgun Excitation Circuit

Cao,

Xiang,

Qiao

et al. 2023

Electronics

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The augmented electromagnetic railgun has demonstrated more potent electromagnetic force, a low excitation current, and less rail thermal damage, showing good potential in heavy load launch. However, the augmented railgun’s load characteristics differ from the conventional double-rail railgun. In the augmented railgun launching experiment, it was found that the fly-wheel diode was damaged, and the capacitive power supply could not discharge fully, which led to residual energy and lower energy utilization. This paper began with the characteristics of the sequential trigger circuit, followed by the causes of the above faults, as well as the corresponding solutions. Based on the conventional excitation circuit, fault detection experiments were carried out first, and the fault mechanism was clarified. Furthermore, according to the solutions proposed, the conventional excitation circuit was improved so that it can work normally when a heavy inductance was loaded. Finally, the sequential trigger experiment was carried out again with the same circuit parameters. The research results showed that the fly-wheel diode could work normally after the circuit was improved, and the problem of residual energy could also be solved effectively. Moreover, the output performance was almost unaffected.

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Section: Solution Of the Residual Capacitive Energymentioning

confidence: 99%

Fault Mechanism and Improvement in the Augmented Railgun Excitation Circuit

Cao,

Xiang,

Qiao

et al. 2023

Electronics

Self Cite

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“…From a quantitative perspective, based on the mechanism of the pulse discharge generated by the breakdown and the accompanying characteristic phenomena of pulse discharge described above, discharge at extremely high voltage belongs to the type of spark discharge [12], generating discharge voltage pulses with a width of ns. Based on the basic characteristics of spark discharge and the gap breakdown characteristics of high voltage [13][14][15][16][17], we have determined that the time-domain width of the generated nanosecond width discharge pulse is within tens of nanoseconds (20-60 ns), with a characteristic value of 40 ns. Spark discharge is based on the streamer theory.…”

Section: Railgunmentioning

confidence: 99%

Investigation of the Distribution Problem in the Operating State of an Electromagnetic Railgun: Radio Fuse Disturbance, Field Characteristics, and Susceptible

Wen

Wang

2023

Electronics

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The purpose of this article is to analyze the front door coupling effect that may occur in the projectile receiver due to the discharge pulse radiation in electromagnetic railguns, and to simulate the discharge pulse interference. This phenomenon will have an impact on the launch of the projectile, causing its fuse to be disturbed, ultimately affecting the weapon performance of the electromagnetic railgun. Discharge refers to when the armature carrying the projectile is fired out of the chamber, and the armature connected between the two rails detaches, causing a circuit break in the electrical circuit during the operation of the electromagnetic railgun. The current flowing through the armature is disturbed, causing an instantaneous high voltage to penetrate the air gap between the two rails, generating nanosecond pulse width discharge voltage pulse radiation, with a spectrum of up to tens of megahertz. In this paper, we establish a receiving antenna model on the projectile, which is essentially a horn antenna, receiving electromagnetic pulses from the discharge process, and coupling the pulse interference through its front door. During the analysis and calculation, we established an antenna receiver model located in the C-band with a frequency of 6 GHz for simulation, analyzed and calculated the actual interference loaded on the projectile after front door coupling, and verified the correctness of the simulation settings and results by comparing with the literature. Finally, we found that because the main energy spectrum of the pulse is at MHz level, when the front door of the C-band horn antenna is coupled, the standing wave ratio of the antenna is very large and the gain is very small, so the pulse interference is filtered, which can make the interference finally loaded on the projectile insufficient to affect the normal operation of the projectile. At the same time, it is recommended to add an RF filter to the receiving channel to further enhance anti-interference ability, so as to ultimately enable the electromagnetic railgun to function properly.

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Effect of Bore Parameters and Effective Mass Ratio on Launcher Effective Efficiency

Xiao,

Li,

Yan

et al. 2024

Energies

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The electromagnetic rail launcher has the advantages of high muzzle velocity, long-range and controllability and has received extensive attention from researchers in various countries. The launcher efficiency reflects the ability of the launcher to convert electrical energy into kinetic energy of the load and is an important parameter of the electromagnetic rail launcher, which includes the launcher effective efficiency and launcher ineffective efficiency. The bore parameters and the effective mass ratio are important factors for the launcher efficiency. Finite element simulations and experiments were carried out to study the effects of rail separation, the convex arc height and the effective mass ratio on the launcher effective efficiency. Three conclusions were obtained. (1) The launcher effective efficiency increased with the growth of the effective mass ratio, the launcher effective efficiency rose from 7.91% to 17.17% when the effective mass ratio was in the range of 0.28~0.56, and the average value of the improvement in the launcher effective efficiency under different conditions of bore parameters is 8.24%. (2) The launcher effective efficiency rose with the increment in the rail separation. As the rail separation increased from 14 mm to 16 mm, the launcher effective efficiency improved by an average of 0.70%, and the increment in the launcher effective efficiency decreased with the growth of rail separation. (3) The launcher effective efficiency increased with the growth in the convex arc height. As the convex arc height rose from 0 mm to 1 mm, the launcher effective efficiency improved by 0.77% on average. Moreover, the muzzle velocity and the acceleration process of the armature in the bore were calculated. The conclusions were the same as the conclusions of the experiments.

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Utilization Optimization of Capacitive Pulsed Power Supply in Railgun

Cited by 3 publications

References 15 publications

Fault Mechanism and Improvement in the Augmented Railgun Excitation Circuit

Fault Mechanism and Improvement in the Augmented Railgun Excitation Circuit

Investigation of the Distribution Problem in the Operating State of an Electromagnetic Railgun: Radio Fuse Disturbance, Field Characteristics, and Susceptible

Effect of Bore Parameters and Effective Mass Ratio on Launcher Effective Efficiency

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