Study of Current Pulse Form for Optimization of Railguns Forces

Rabiei, Arash; Keshtkar, Asghar; Gharib, Leila

doi:10.1109/tps.2018.2805329

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…It can be easily avoided by loosening the trigger sequence. Previous researchers proposed many optimization methods for the trigger sequence of the railgun [19][20][21]. They all show the characteristics of the loose trigger criterion, and that the problem of residual capacitive energy does not occur.…”

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

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“…In Equation (8), Wa is the actual capacity used of the capacitive PPS, and Wr is the rated capacity of the capacitive PPS. According to Equation ( 8), η is only 8.91% with the CVCM but 33.28% with the DVCM.…”

Section: Number Of Pfus 47 16mentioning

confidence: 99%

“…It is essential to carry out the miniaturization design of the capacitive PPS according to the requirement of excitation current. Previous research has shown that the railgun's projectile is subjected to stable accelerating force with the excitation of stable current, which is beneficial to reduce the transition, so the excitation current is always adjusted to a square waveform [8]. To obtain ideal current waveform, the most commonly used method is to design the trigger strategy of the capacitive PPS [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Utilization Optimization of Capacitive Pulsed Power Supply in Railgun

et al. 2022

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The excitation pulse current used to drive the railgun needs to present very a high magnitude (hundreds of kA) flat-top with very low ripple. At present, the main method to obtain this current is to increase the number of the capacitive pulsed power supply (PPS) modules. However, low utilization and massive volume of the railgun system would occur with this method, hampering the application of railgun. Therefore, the utilization optimization technology of PPS is researched in this paper. In order to obtain highly stable flat-top current, the control strategy of the capacitive PPS is designed, and a new charging voltage configuration is proposed, which significantly decreases the use of the capacitive modules. Besides, a miniaturization transformation scheme of capacitive PPS is proposed based on the control strategy. The result shows that the flat-top current ripple has the biggest influence on the PPS utilization, and the smaller the flat-top current ripple, the lower the utilization. When the current with 200 kA magnitude and 0.75% flat-top current ripple is achieved, an 81.9% decrease of volume and a 428.7% utilization improvement are achieved through miniaturization transformation.

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“…Lin Q et al modeled and simulated the transient eddy current field on an electromagnetic railgun [15]. Rabiei A et al discussed the influence of the pulse current waveform on the rail current density and armature velocity without the containment [16]. Landen D et al pointed out that the induced eddy current on the containment would weaken the armature propulsion [17].…”

Section: Introductionmentioning

confidence: 99%

Effects of pulse current waveform on electromagnetic railgun considering the eddy current effects

2023

J. Phys.: Conf. Ser.

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This paper investigates the effects of pulse current waveform on electromagnetic railgun considering the containment eddy current effects. First, a three-dimensional transient finite element model of the railgun with a metal containment and a pulse current waveform control model with constant feed energy are established. Then, taking the eddy current effect into account, the effects of different waveforms with constant feed energy on the eddy current, the rail current, the armature propulsive force, the rail repulsive force, the eddy current energy consumption, and the muzzle kinetic energy are analyzed. Finally, the simulation shows that reducing the slope of the rising edge of the pulse current can effectively suppress the eddy current and improve the muzzle kinetic energy. When the amplitude and the slope of the rising edge are determined, the excessively long flat top section will lead to more serious eddy current concentration at the ending moment of discharge, more eddy current loss, and less muzzle kinetic energy. Too high or too low amplitude of the pulse current is not conducive to the improvement of the muzzle kinetic energy. The investigation of this paper provides some references for the design of electromagnetic railgun and the selection of pulse current waveform.

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Study of Current Pulse Form for Optimization of Railguns Forces

Cited by 5 publications

References 8 publications

Fault Mechanism and Improvement in the Augmented Railgun Excitation Circuit

Fault Mechanism and Improvement in the Augmented Railgun Excitation Circuit

Utilization Optimization of Capacitive Pulsed Power Supply in Railgun

Effects of pulse current waveform on electromagnetic railgun considering the eddy current effects

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