Rail heating analysis for multishot EM gun operation

Fish, Scott; Phipps, C.; Tang, Victor

doi:10.1109/20.738439

Cited by 20 publications

(4 citation statements)

References 5 publications

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“…For the armature movement, rigid body motion restricted to the x direction is assumed. The armature is accelerated through the rails due to the Lorentz force, equation (24), and its position (x a ) is determined by Newton's second Law, equation (25)…”

Section: Mathematical Formulationmentioning

confidence: 99%

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Three-dimensional launch simulation and active cooling analysis of a single-shot electromagnetic railgun

2014

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An electromagnetic railgun is one of the applications of electromagnetic launchers, which are devices used to accelerate projectiles to velocities exceeding those attained with conventional propelling systems. A magnetic field is generated when current flows through two conductive rails connected by a moving armature. The current that passes through the rails exerts an electromagnetic force on the armature and causes it to accelerate to high speeds. In this work, a threedimensional transient model for the thermal and electromagnetic solutions of the launch process is presented. The model accounts for the determination of the current and temperature profiles inside the rails, the projectile movement, and the cooling process after the first launch. Focus is given to the thermal management where five different arrangements, one without cooling and four that include cooling channels, are studied. A 10 to 50 K reduction in the peak temperature was obtained with the inclusion of cooling channels when compared to the no-cooling-channel case. It was also shown that the position and size of these channels can be optimized in order to reduce this peak temperature.

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Section: Mathematical Formulationmentioning

confidence: 99%

“…In 1999, Fish et al 24 performed a 2D finite-element analysis for heat dissipation between multiple shots for rails with and without cooling. In their study, heat diffusion along the length of the rail was neglected.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional launch simulation and active cooling analysis of a single-shot electromagnetic railgun

2014

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“…EMAP-3D has been used to study heat dissipation between multiple shots with and without active cooling [29] and more recently, Satapathy evaluated the thermal stresses in the rails and gun support structure [30], [31]. Satapathy and Vanicek [32] present the first analysis of this type which includes motion of the armature.…”

Section: Railgunsmentioning

confidence: 99%

Electromagnetic launch science and technology in the United States enters a new era

Fair

2005

IEEE Trans. Magn.

107

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Electromagnetic launch science and technology in the United States is on the threshold of a major new advance in its development. Significant developments in hypervelocity electromagnetic launch and in hypervelocity high-G guidance and control components have provided the impetus for exploring advanced electromagnetic weapon systems capable of providing revolutionary new capabilities. These systems include the electromagnetic launch of aircraft from Navy aircraft carriers, hypervelocity electromagnetic guns on ships to provide protection and to launch guided projectiles to extraordinary ranges, and lightweight ground combat vehicles propelled by hybrid electric power protected by electromagnetic armor and capable of defeating advanced armor targets with lightweight hypervelocity penetrators from electromagnetic railguns. This presentation will summarize many of the technical advances leading to the decision to implement these new engineering efforts.

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“…In previous studies, plenty of literatures have investigated rail heating and cooling by experiments or simulations. Fish et al analyzed heat distribution characteristics between multiple shots without and with active cooling conditions in rails by finite element code EMAP3D (Electro-Mechanical Analysis Program in 3 Dimension) [16]. Motes et al revealed that Joule heat was the dominant source of heat in rail during launch process under single shot mode by simulations and experiments [17].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis in Electromagnetic Rail Launcher Taking Friction Heat into Account Under Active Cooling Condition

et al. 2020

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A high-efficiency thermal management system is one of the key points in the practical application of electromagnetic rail launcher (ERL). In this paper, the thermal characteristics in ERL with the section of rectangle, convex, and concave rails by active cooling under different friction coefficient condition are investigated. By two cooling approaches, at two launch rates, with four friction coefficients, peak temperature in convex rails at the same moment is minimum in three types rails. Joule heat dominates in three shapes rail by channel or surface/channel cooling approach, but friction heat is a nonnegligible part under multiple launching mode. The spatial and temporal distribution features of peak temperature of three shapes rail with different friction coefficient under active cooling condition are compared. The mathematical relations between friction coefficient, time and temperature rising caused by friction at pulse end time and shot end moment in ERL with the three types rail are obtained, respectively. In terms of obtaining lower maximal temperature in rail, the ERL with convex rails is the best one. INDEX TERMS Thermal analysis, electromagnetic rail launcher, friction heat, active cooling.

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Rail heating analysis for multishot EM gun operation

Cited by 20 publications

References 5 publications

Three-dimensional launch simulation and active cooling analysis of a single-shot electromagnetic railgun

Three-dimensional launch simulation and active cooling analysis of a single-shot electromagnetic railgun

Electromagnetic launch science and technology in the United States enters a new era

Thermal Analysis in Electromagnetic Rail Launcher Taking Friction Heat into Account Under Active Cooling Condition

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