Overview of Some Recent EML Research in Russia

Shvetsov, G. A.; Rutberg, P.G.; Budin, A. V.

doi:10.1109/tmag.2006.887597

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…The loading function along the direction of movement is defined in a form of the Heaviside step function if if (1) where represents pressure profile fixed to local coordinate , while represents the position of the load front (projectile) at time instant . It can be expressed as (2) where is the velocity of the projectile. Two types of transient loading are considered.…”

Section: Rail Geometry Materials Data and Loadingmentioning

confidence: 99%

Structural Mechanics of Railguns in the Case of Discrete Supports

et al. 2009

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In this paper, numerical calculations concerning the dynamic behavior of a railgun are presented. At the first stage, the structural problem can be decoupled from electromagnetic phenomena as well as from the local projectile behavior. The magnetic pressure repelling the rails from each other and expanding with the speed of the projectile serves as a boundary condition for purely mechanical calculations. The particularity of the investigation is represented by the type of railgun housing. For some years, the ISL has been using laboratory housings of an open design allowing, for instance, to take flash radiographs during launch. The repelling forces are mainly taken by discrete supports in the form of steel bolts. These bolts are connected to bars made of glassfiber-reinforced plastics, while the rails are mounted on these bars. A 2-D finite-element model of a complex housing was developed in this paper. Bars, including rails, are described by plane-stress elements, while bolts, playing the role of discrete elastic supports, are presented by truss elements. The model is implemented using the ANSYS code. Deformation properties of the rail section and elastic supports are examined by considering a static solution, assuming constant loading. Differences between 2-D and conventional beam models being of importance for this kind of problem are briefly discussed. Transient analysis was performed for a set of constant loading velocities (600-1600 m/s) and for the experimentally derived transient-loading profile. The latter was obtained in the railgun experiments performed using the ISL-railgun EMA3 with a caliber of 15 30 mm 2 and typical muzzle velocities up to 1600 m/s as well as peak currents of about 600 kA.Index Terms-Discrete elastic supports, electromagnetic railgun, finite-element (FE) method, transient dynamics.

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Section: Rail Geometry Materials Data and Loadingmentioning

confidence: 99%

Structural Mechanics of Railguns in the Case of Discrete Supports

et al. 2009

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“…Experimental studies of a combined accelerator [1], [2] and electric-discharge launchers operating on hydrogen [3] have been continued at the Institute for Electrophysics and Electric Power, the Russian Academy of Sciences. The efforts are focused on both improving the performance of propulsion devices and studying the high-current pulsed discharge in the superdense gas medium in the discharge chamber of launchers.…”

Section: Electric-discharge Launchersmentioning

confidence: 99%

“…T HIS paper presents the main electromagnetic launch activities in Russia since the 13th EML Symposium [1]. The main directions of EML research in Russia have not changed over the years.…”

Section: Introductionmentioning

confidence: 99%

New Steps in EML Research in Russia

2009

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The overview summarizes the main electromagnetic activities in Russia since the 13th Electromagnetic Launch Technology Symposium in 2006. This research has been focused on the development and improvement of electric-discharge launchers, railguns, and electrothermal-chemical launchers. Research efforts have been directed toward studying the physical phenomena and processes limiting the attainment of high velocities and life time of launchers. Considerable attention has been paid to solving problems related to material erosion, the manufacture of new materials and their testing in high-current arc discharges and the search for new applications of launchers in science and engineering.

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“…Enormous current densities, high velocities of moving forces coupled with the dynamical interaction at the rail surface present a great challenge. Advances in electromagnetic launch science and technology can be found in review papers [3,4].…”

Section: Introductionmentioning

confidence: 99%