Simulations on Current Distribution in Railgun Under Imperfect Contact Conditions

Li, Chengxian; Xia, Shengguo; Chen, Lixue; He, Junjia; Xiong, Yan; Zhang, Chendong; Yao, Jinming

doi:10.1109/tps.2019.2907121

Cited by 19 publications

(4 citation statements)

References 8 publications

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“…Taking into account the relationship between the magnetic field diffusion and input current, it is important to note that the input current directly affects the simulation results. The commonly used input current is equivalent to a Bi-exponential [ 28 ] or a three-segment function [ 29 ] based on test results, as illustrated in Figure 15 . The total duration is set to 12 ms and the peak current value reaches 3.15 MA.…”

Section: Resultsmentioning

confidence: 99%

Simulation and Experimental Verification of Magnetic Field Diffusion at the Launch Load during Electromagnetic Launch

Yang,

Yin,

et al. 2023

Sensors

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The unique magnetic field environment during electromagnetic launch imposes higher requirements on the design and protection of the internal electronic system within the launch load. This low-frequency, Tesla-level extreme magnetic field environment is fundamentally distinct from the Earth’s geomagnetic field. The excessive change rate of magnetic flux can readily induce voltage within the circuit, thus disrupting the normal operation of intelligent microchips. Existing simulation methods primarily focus on the physical environments of rails and armatures, making it challenging to precisely compute the magnetic field environment at the load’s location. In this paper, we propose a computational rail model based on the magneto–mechanical coupling model of a railgun. This model accounts for the dynamic current distribution during the launch process and simulates the magnetic flux density distribution at the load location. To validate the model’s accuracy, three-axis magnetic sensors were placed in front of the armature, and the dynamic magnetic field distribution during the launch process was obtained using the projectile-borne-storage testing method. The results indicate that compared to the previous literature methods, the approach proposed in this paper achieves higher accuracy and is closer to experimental results, providing valuable support for the design and optimization of the launch load.

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Section: Resultsmentioning

confidence: 99%

Simulation and Experimental Verification of Magnetic Field Diffusion at the Launch Load during Electromagnetic Launch

Yang,

Yin,

et al. 2023

Sensors

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“…In that same year, Dai et al [89] analyzed the local convergence characteristics of current and heat during the electromagnetic propulsion process based on the dynamic multifield coupling model. In addition, Li et al [90] used finite element software simulation to analyze the current distribution characteristics of a non-flat armature-rail contact surface of the electromagnetic railgun. In 2020, Zhu et al [91] analyzed the sliding electrical contact characteristics of an enhanced railgun based on contact impedance and a sliding friction coefficient.…”

Section: ) System Optimization Stagementioning

confidence: 99%

Analysis of the Research Progress of Electromagnetic Railgun Based on CiteSpace

Mao,

Pang,

Guo

et al. 2024

IEEE Access

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An electromagnetic railgun is a new type of weapon with ultrahigh speed based on electromagnetic thrust. It is used in important military domains, such as long-range strikes, strategic air defense, and ballistic interception. It is also used in aerospace fields, such as space debris cleanup, microsatellite launch, and space station relay launch, so its future prospects are excellent. We analyzed 1324 publications on electromagnetic railgun using CiteSpace and identified information including authors, institutions, journals, and popular research topics and trends. Our analysis found that the University of Texas is the research institution that has published the most documents on electromagnetic railgun, and French researcher Markus Schneider has published the most documents. The journals of IEEE Transactions on Magnetics and IEEE Transactions on Plasma Science have played an important role in promoting the development of electromagnetic railgun. The research direction of electromagnetic railgun has a distinct multidisciplinary characteristic because it touches on physics, engineering science, mathematics, materials science, energy and fuel, communication technology, instrumentation, and computer science. The development process of electromagnetic railgun can be grouped into three stages: basic theoretical research, engineering research, and system optimization research. The major research topics include electromagnetic force, armature design, rail materials, pulsed power supply, armature-rail contact surface characteristics, and coupling analysis of multiple physical fields. Future electromagnetic railgun will be scalable in terms of armature-rail contact characteristics and life span, energy storage density of power supply, current-carrying capability and thermal management of launcher materials, optimization design of armature structure, and complex data processing of control systems.

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“…From the contact resistance model, it is known that contact resistance is related to contact pressure, so uneven contact pressure can lead to differences in contact resistance at different locations of contacts, which affects the magnetic diffusion process and changes the current distribut ion. The effect of uneven contact pressure distribution on current distribution has been studied by many scholars in the literature [22][23][24][25], and the effect of contact distribution on current density and electromagnetic force distribution in the initial contact between armature and rails has been studied in the literature [23]. The contact pressure distribution during the whole firing process was simulated by 3D modeling in the literature [24].…”

Section: Current Distribution Characteristicsmentioning

confidence: 99%

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

2023

J. Phys.: Conf. Ser.

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The analysis of the sliding electrical contact characteristics between the armature and rails is an important research area for electromagnetic railguns. In this paper, a sliding electrical contact model considering non-ideal factors is introduced, the magneto-thermal coupling characteristics of the contact interface are summarized, and the current and temperature distribution characteristics are outlined. In the end, measures that can be taken to improve the contact performance are presented in terms of armature rail material selection and structural optimization.

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Simulations on Current Distribution in Railgun Under Imperfect Contact Conditions

Cited by 19 publications

References 8 publications

Simulation and Experimental Verification of Magnetic Field Diffusion at the Launch Load during Electromagnetic Launch

Simulation and Experimental Verification of Magnetic Field Diffusion at the Launch Load during Electromagnetic Launch

Analysis of the Research Progress of Electromagnetic Railgun Based on CiteSpace

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

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