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Numerical simulation of dynamic large deformation and fracture damage for solid armature in electromagnetic railgun

Defence Technology（防务技术） 2020年第2期16卷 348-353页

作者： Qing-hua Lin Bao-ming Li National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyP.O.Box210094NanjingPR China

The design of solid armature of railgun should take full account of its operating conditions and material properties because the armature is subjected to dynamic loading conditions and experiences a complicated electrical,thermal and mechanical process in the interior ballistic cycle.In this paper present,we first introduced a multi-physical field model of railgun,followed by several examples to investigate the launching process.Especially,we used the explicit finite element method,in which material nonlinearity and geometric nonlinearity were accounted,to investigate the deform behaviors of solid armature.The results show that the dynamic mechanical process of armature is dependent on the armature geometry,material and exciting electric current.By the numerical simulation,the understanding of the fracture mechanism of solid armature was deepened.

关键词： Electromagnetic railgun Solid armature Fracture Explicit finite element Numerical simulation

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Analysis of in-bore magnetic field in C-shaped armature railguns

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Defence Technology（防务技术） 2019年第1期15卷 83-88页

作者： Qiang Yin He Zhang Hao-jie Li Yu-xin Yang Ministerial Key Laboratory of ZNDY Nanjing University of Science and Technology

In order to analysis the distribution characteristics of in-bore magnetic field for C-shaped armature electromagnetic railgun, a computational model considering dynamic contact pressure is established. By solving the dynamic equation, the in-bore motion characteristics of the armature are obtained. The distribution of current in the rail and armature is analyzed based on the magnetic diffusion equation and Ampere’s law. On this basis, three simulation models are proposed, which correspond to static state,motion state and motion state considering the velocity skin effect. The magnetic field of the investigated points along the central axes of the armature front end are obtained. The results show that, in static state,the peak magnetic flux density of each investigated point is greater than the other two states. Velocity skin effect leads to a decrease in peak magnetic flux density. The change of motion state has little influence on the peak magnetic flux density of the investigated point that far away from the armature. The calculated results can be used in the electromagnetic shielding design of intelligent ammunition.

关键词： Railgun C-shaped armature Magnetic flux density

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Simulation and analysis of an augmented railgun launching process

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Journal of Harbin Institute of Technology(New Series) 2012年第2期19卷 53-58页

作者：王振春李惠光战再吉 School of Science and Technology Yanshan University Institute of Electrical Engineering Yanshan University

For characterizing a series augmented railgun launching process,the simulation and experiment were done.In the experiment,only observation of muzzle voltage,current and armature position were insufficient to analyze launching process deeply since armature velocity,resistance force and voltage drop of armature were also important to the launching process.In the present work,based on MATLAB/SIMULINK software platform,the simulation model was built,and the dynamic characteristics of system were simulated.Furthermore,the variations of armature velocity,total resistance force and voltage drop of armature against time were investigated based on the data of B-dot probes(to measure position of armature),Rogowsky coil(to monitor current) and high voltage probes(to observe muzzle voltage).The results indicated that,the voltage drop of armature and the total resistance force showed roughly regulartendency.There were obvious stages observed in the two-turn series augmented railgun launching process.

关键词： armature electromagnetic launching inductance gradient muzzle voltage series augmented

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