Current and heat transport in the solid-armature railgun

Powell, J. David; Zielinski, A.E.

doi:10.1109/20.364618

Cited by 32 publications

(11 citation statements)

References 7 publications

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“…This distribution is considered as the initial condition for the next instant. Also the electrical and thermal specifications of the material which are a function of temperature, are calculated from the given relationships and graphs in references [6,7] and is used for modeling of the next time step . Fig (4) shows a sample of obtained result from this analysis for temperature distribution at 1.98 ms.…”

Section: Magnetic Analysismentioning

confidence: 99%

A solution to inhomogeneous 3D railgun

Soleimani

Keshtkar

2000

2000 5th International Symposium on Antennas, Propagation, and EM Theory. ISAPE 2000 (IEEE Cat. No.00EX417)

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In railgun, which is used to accelerate objects, electrical energy is used to drive the system. In order to reach hypervelocity, a power supply with immense amount of energy must be used which causes an extra ordinary current on the rail and the armature. This current makes thermal energy by ohmic attenuation and warms up various points and therefore changes the electrical , thermal and mechanical specifications of the structure. This paper present a method by which one can consider the inhomogenity created by temperature changes along the structure. In this method , the instantaneous current distribution in the structure and the heat caused by it are calculated, and then the temperature distribution is obtained . The electrical conductivity (a) , thermal conductivity (k) and specific-heat (c) are considered inhomogeneous and are calculated at every instant until the specifications of the material forming the structure be corrected at any instant. Three dimensional finite element method with non-uniform meshing at any instant is used.

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Section: Magnetic Analysismentioning

confidence: 99%

A solution to inhomogeneous 3D railgun

Soleimani

Keshtkar

2000

2000 5th International Symposium on Antennas, Propagation, and EM Theory. ISAPE 2000 (IEEE Cat. No.00EX417)

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“…1). The current that passes through the rail exert an electromagnetic force called Lorentz force on the armature and causes it to accelerate to high speed [4].…”

Section: Introductionmentioning

confidence: 99%

Stress analysis of the rails of a new high velocity armature design in an electromagnetic launcher

Ghassemi

Varmazyar

2008

International Journal of Impact Engineering

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“…The numerical technique that is applied to solve Equations (12) and (13) has been described in earlier work (Powell, Walbert, & Zielinski 1993) and is not described in detail here. In brief, all derivatives are represented by standard finite differences, and the resulting nonlinear equations are solved by iteration (Ames 1997).…”

Section: Numerical Solutionmentioning

confidence: 99%

“…In previous work (Powell, Walbert, & Zielinski 1993), we developed a twodimensional (2-D) model for investigating the coupled effects of electromagnetic field transport and heat transport in solid-armature railguns. The model has been extended on several occasions in recent years, and studies have been undertaken for various types of armatures (Powell & Zielinski 1995a, 1995b, 1997, 1999.…”

Section: Introductionmentioning

confidence: 99%

Current and Heat Transport in a Double Taper Sabot-Armature

Powell¹,

Zielinski²

2001

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Approved for public release; distribution is unlimited. AbstractA model developed previously to investigate the transport of electromagnetic fields and energy in solid-armature railguns is simplified to exclusively study heating within the interior of the armature. A particular type of armature is then specifically studied, and the effect of variation of a number of parameters that affect its geometry is investigated. Results of the calculations are studied carefully and explained by basic physical principles. Some indication of how the results and conclusions can be used to influence design criteria for armatures is also indicated.

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Current and heat transport in the solid-armature railgun

Cited by 32 publications

References 7 publications

A solution to inhomogeneous 3D railgun

A solution to inhomogeneous 3D railgun

Stress analysis of the rails of a new high velocity armature design in an electromagnetic launcher

Current and Heat Transport in a Double Taper Sabot-Armature

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