Thermal characteristics of a laboratory electromagnetic launcher

Vanicek, H.; Satapathy, S.

doi:10.1109/tmag.2004.839286

Cited by 30 publications

(6 citation statements)

References 13 publications

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“…For initial conditions, 26 capacitors were assumed to store 2 MJ; simulations gave 1.2 MJ input at the breech, consistent with [13]. Assuming capacitor energy E c = q j 2 /2C j uniformly distributed to the 13 pairs of capacitors of Figure 2, each q i (0) " 2(18.73 C).…”

Section: System Parameters and Initial Conditionsmentioning

confidence: 98%

“…The largest time step was 50 nanoseconds. Simulations mimicked Shot 185 [13] of IAT's MCL railgun [14], with " i V breech dt = 1.2MJ from the power supply. Parameters were estimated from data [13], [14], material tables [15], [16] or formulas, see Table 1.…”

Section: System Parameters and Initial Conditionsmentioning

confidence: 99%

“…Simulations mimicked Shot 185 [13] of IAT's MCL railgun [14], with " i V breech dt = 1.2MJ from the power supply. Parameters were estimated from data [13], [14], material tables [15], [16] or formulas, see Table 1. Contact resistances R ca and R cb , and sliding friction, almost impossible to measure but known to change during launch, were assigned initial values consistent with [16], [17] and corrected during simulations.…”

Section: System Parameters and Initial Conditionsmentioning

confidence: 99%

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A bond graph model of an electromagnetic launcher

Bryant

2010

Proceedings of the 2010 Spring Simulation Multiconference

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An electromagnetic launcher (EML), also known as a railgun, is a complex, dynamically coupled system with interacting electric, magnetic, mechanical, and thermal subsystems. Presented is a bond graph model of the EML forward propulsion, including electrical systems (power supply, rails, armature, skin effect in rails, and electrical contacts between armature and rails), magnetic effects (Lorentz forces and response of magnetic containment system for magnetic flux), mechanical systems (motions of armature and launch package) and interactions between armature motion and magnetic field (i.e., velocity skin effect). The bond graph model will be constructed, from which governing state equations will be extracted, and simulation results presented.

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Section: System Parameters and Initial Conditionsmentioning

confidence: 98%

Section: System Parameters and Initial Conditionsmentioning

confidence: 99%

Section: System Parameters and Initial Conditionsmentioning

confidence: 99%

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A bond graph model of an electromagnetic launcher

Bryant

2010

Proceedings of the 2010 Spring Simulation Multiconference

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“…The EMAP3D program is capable of dynamic meshing and overall characteristic calculation of the sliding electrical contact process, and the reliability of its results has been verified through many tests and simulation calculations, but there is still a large error between the calculated value of the total armature-side current and the actual current excitation value [35] , and there is still a lot of room for improvement in the simulation efficiency of the original version run, so there has been a corresponding parallel program launched after the release Therefore, after the release, parallelizations have been introduced to complete the overall functionality.…”

Section: Figure 6 Current Density and Flux Density At Peak Currentmentioning

confidence: 99%

A Review of the Computational Investigation of Three-Dimensional Transient Magneto-Thermal Coupling Characteristics of Electromagnetic Railgun Armature and Rail in High-Speed Sliding Electrical Contact

Yang

2023

J. Phys.: Conf. Ser.

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In order to investigate the dynamic process of electromagnetic field distribution, temperature change and the deformation during the launching process of electromagnetic railgun. It is necessary to conduct a three-dimensional coupled electromagnetic-temperature-structure analysis of the rail and armature, which requires the establishment of the corresponding multi-physics field model and the use of appropriate software and algorithms to complete the relevant simulation calculation and solution results. Based on this, this paper summarizes the current domestic and foreign research methods for multi-physics field characteristics under sliding electrical contact conditions, analyses the advantages and disadvantages of each method, and focuses on the updates of the three-dimensional finite element program EMAP3D based on Lagrangian description and the advantages of multi-field coupling. Finally, several considerations and operable spaces for multi-physics field coupling simulation are summarized to provide technical support for subsequent studies on multi-physics field characteristics for high-speed sliding electrical contact condition.

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“…In 2005, a 3D numerical study of the first shot that included the armature motion was conducted by Vanicek and Satapathy. 26 The software package EMAP3D was utilized to perform the calculations. The data of current, armature velocity and position during the shot were compared between the numerical results and the actual shot data from IAT’s (Institute of Advanced Technology) Medium Caliber Launcher.…”

Section: Introductionmentioning

confidence: 99%

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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Thermal characteristics of a laboratory electromagnetic launcher

Cited by 30 publications

References 13 publications

A bond graph model of an electromagnetic launcher

A bond graph model of an electromagnetic launcher

A Review of the Computational Investigation of Three-Dimensional Transient Magneto-Thermal Coupling Characteristics of Electromagnetic Railgun Armature and Rail in High-Speed Sliding Electrical Contact

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

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