MAGRAC--A railgun simulation program

Deadrick, F.J.; Hawke, R.S.; Scudder, J.K.

doi:10.1109/tmag.1982.1061800

Cited by 45 publications

(12 citation statements)

References 2 publications

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“…Assuming m represents the armature mass，L ' represents the rail inductance gradient, according to the principle of dynamics, the force in the armature can be described as equation (6) and the armature acceleration a can be obtained as equation (7) [12][13][14].…”

Section: Formula Derivation Of the System Efficiency Of The Syncmentioning

confidence: 99%

Study on the system efficiency of the synchronously-triggered capacitive pulsed-power supply in the electromagnetic railgun system

Gong

Liu

2014

2014 17th International Symposium on Electromagnetic Launch Technology

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The electromagnetic railgun system based on capacitive pulsed-power supply (CPPS) has obtained widespread applications because of its obvious advantages over the inductive ones on mature technology, operational reliability and feasible financial condition. However, the existing CPPS-based electromagnetic railgun system works with low efficiency. In this paper, the systematical study on the system efficiency of the synchronously-triggered capacitive pulsed-power supply in a 1MJ electromagnetic railgun system is proposed. Firstly, all PFUs are supposed to be triggered synchronously and the load is simplified as a resistor. Then the system performance criteria, i.e. the launch velocity of the armature v end and the system efficiency η, are expressed as the function of four independent system variables, i.e. the capacitance of each pulse forming unit (PFU) C, the pre-charged voltage U C of capacitors, the rail length l, and the armature mass m. The relationship between η (or v end ) and any two independent variables can be found under the environment of Matlab®R2012a by fixing the other two parameters. The results are then verified under the environment of Simplorer®8. These figures can be used to in instruct the design of the pulsedpower supply for a designated load or the railgun for a designated source. The study can provide a theoretical foundation for the future designs to get higher system efficiency.

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Section: Formula Derivation Of the System Efficiency Of The Syncmentioning

confidence: 99%

Study on the system efficiency of the synchronously-triggered capacitive pulsed-power supply in the electromagnetic railgun system

Gong

Liu

2014

2014 17th International Symposium on Electromagnetic Launch Technology

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“…The resistance of the launcher changes with time as the projectile physically moves down the barrel and the magnetic field diffuses into the rail. Several investigations have been performed using an analytical approach [5], segmented rail with an effective height [6]- [7], segmented rails where the magnetic field diffuses into multiple surfaces [8], and full three dimensional simulations of the launcher [9]. In this paper, an effective height model is used to simulate the transient rail resistance based on the method presented by Parker et al [7].…”

Section: Supplementary Notesmentioning

confidence: 99%

Heat Generation During the Firing of a Capacitor-Based Railgun System

2007

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Abstract-Railguns use a high-current, high-energy electrical pulse to accelerate projectiles to hypersonic velocities. Pulse forming networks that employ capacitors as the energy store are typically used to shape the required electrical pulse. A significant fraction of the stored energy (25 -40% in large caliber railguns) is converted to projectile kinetic energy during launch. After the projectile exits the launcher, the balance of the energy has either been dissipated as heat in the circuit components or is stored in system inductance. If an energy recovery scheme is not employed, the inductor energy will also be dissipated in the resistance of the active circuit components. A circuit analysis has been performed in order to calculate the current profile from the PFN. A higher fidelity solution was achieved by accounting for the temperature dependent resistance of the rails. This information along with individual component resistance and inductance was used to calculate the distribution of energy subsequent to a single pulse. Detailed component heating information is important when considering the overall thermal management of the system. Once this information has been obtained, the components that require external cooling can be identified, and an appropriate thermal management system can in turn be designed.

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“…Manuscript Another disadvantage is that large PSPICE models often come along with convergence problems. Another way to simulate the performance of a rail accelerator is to express the equations as a program and to use solver libraries, as published in [4]. The drawback is that the code is difficult to extend or to modify.…”

Section: Introductionmentioning

confidence: 99%

Block Diagram Model for the Simulation of an Electromagnetic Rail Accelerator System

Siaenen

Schneider

Hogan

2015

IEEE Trans. Plasma Sci.

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Rail accelerators are superior to classical gas-driven accelerators with regard to attainable terminal velocity, ignition delay variation, and controllability. The behavior is generally described with a system of nonlinear differential equations, which can be solved in many ways. This is done in order to describe an existing launcher, to predict its performance when parameters change, or to estimate the properties of such a system in the design phase. This paper presents a simplified electromechanical system of differential equations in a novel form. This form enables scientists to solve the equations using one of the following software: Scilab, MATLAB, or a similar one. The model is robust and parameter changes have a low impact on the solving time. This makes it a reliable tool for parametric studies. The model comprises pulsed power capacitors, the pulseforming network, cables, and the launcher itself. At first, the electrical part is described with its circuit equivalent and coupled with the mechanical process. Second, the system is analytically transposed to a standard form. This form is then transferred into the simulation software, which solves the equations. It can simply be adapted to other launchers and modified to comprise nonlinear side effects. The simulation results are compared with experimental results from the augmented rail accelerator at the French-German Research Institute of Saint-Louis, France.

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MAGRAC--A railgun simulation program

Abstract: Tlfc is i fKfmt .f 1 pftr mtnki br (ttH-• itiijl-••? te wfc tafa. HBoli-. •• Htpmt «•*-**«» e-" nil m W art » wfiifctrf lifcir i friM»in «r*ci Knnmi «F ns rawai s unfa ^

Cited by 45 publications

References 2 publications

Study on the system efficiency of the synchronously-triggered capacitive pulsed-power supply in the electromagnetic railgun system

Study on the system efficiency of the synchronously-triggered capacitive pulsed-power supply in the electromagnetic railgun system

Heat Generation During the Firing of a Capacitor-Based Railgun System

Block Diagram Model for the Simulation of an Electromagnetic Rail Accelerator System

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MAGRAC--A railgun simulation program

Abstract: Tlfc is i fKfmt .f 1 pftr mtnki br (ttH-• itiijl-••? te wfc tafa. HBoli-. •• Htpmt «•*-**«» *e-" nil m W art » wfiifctrf lifcir *i friM»in «r*ci Knnmi «F ns rawai s unfa ^

Cited by 45 publications

References 2 publications

Study on the system efficiency of the synchronously-triggered capacitive pulsed-power supply in the electromagnetic railgun system

Study on the system efficiency of the synchronously-triggered capacitive pulsed-power supply in the electromagnetic railgun system

Heat Generation During the Firing of a Capacitor-Based Railgun System

Block Diagram Model for the Simulation of an Electromagnetic Rail Accelerator System

Contact Info

Product

Resources

About

Abstract: Tlfc is i fKfmt .f 1 pftr mtnki br (ttH-• itiijl-••? te wfc tafa. HBoli-. •• Htpmt «•*-**«» e-" nil m W art » wfiifctrf lifcir i friM»in «r*ci Knnmi «F ns rawai s unfa ^