Energy Partition and Scaling Issues in a Railgun

Satapathy, S.; Vanicek, H.

doi:10.1109/tmag.2006.887684

Cited by 23 publications

(6 citation statements)

References 11 publications

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“…A travel length that scales differently than X/1 = A/1 violates the initial definition of A/1, and this results in a mismatched boundary condition [7]. The voltage matching condition has consistent boundary conditions, but the density of the projectile is inconsistent with constant material properties such that stress transients may not be accurately scaled.…”

Section: Scaling Methods From Literaturementioning

confidence: 99%

“…where B is the magnetic field, J1 is the permeability, J is the current density, E is the electric field, S is the stress tensor, p is the density of the projectile, k is the thermal conductivity, T is the point temperature, Cp is the heat capacity, and (J is the conductivity [4]- [7]. There are many other minor relationships such as the energy stored in a capacitor that are used for scaling, but these will not be listed for brevity.…”

Section: Fundamental Railgun Equationsmentioning

confidence: 99%

“…Previous literature on scaling [4]- [7] has specialized on maintammg constant field parameters such as temperature, magnetic field, and stress, but this type of scaling may not be appropriate for all applications. All scaling methods come from the same basic equations, and each method has at least one or more scaling inconsistency.…”

Section: Introductionmentioning

confidence: 99%

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Application based general scaling in railguns

Sung

Odendaal

2011

2011 IEEE Pulsed Power Conference

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When it comes to scaling rail guns, there is no best or one-size-fits-all methodology. It is important for the researcher to be able to choose the appropriate scaling methods to best match the application in an experiment. This paper is an overview of railgun scaling methods; the generic railgun equations are tailored to obtain suitable methods for applications involving circuits, kinematics, fields, thermal control, and mechanics. These methods can be applied to the power supply of the gun, the gun itself, or both depending on the nature of the investigation. The scaling methods of previous literature are reviewed and expanded upon, and scaling based on circuit modeling is presented and simulated.

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Section: Scaling Methods From Literaturementioning

confidence: 99%

Section: Fundamental Railgun Equationsmentioning

confidence: 99%

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Application based general scaling in railguns

Sung

Odendaal

2011

2011 IEEE Pulsed Power Conference

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“…Reference [11] has pointed out that both the governing equations and the boundary conditions cannot be simultaneously satisfied. It means that railgun is a nonlinear project in nature.…”

Section: B Scaling Relationships Of the Ideal Railgun Modelmentioning

confidence: 99%

Nonlinear scaling study of a railgun

Zhang

Ruan

Liao

et al. 2012

2012 16th International Symposium on Electromagnetic Launch Technology

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Scaling method has been used widely in railgun technology. But nonlinear problem is seldom studied because of the complexity and uncertainty. In order to employ the scaling method better, the paper brings the nonlinear drag model to the solid armature railgun circuit.Several drag functions were compared including drag model associated with velocity (VDM), drag model associated with current (CDM), and drag force associated with integrated factors (IDM). Scaling relationships of these drag models were discussed. And then, a novel experiment was constructed to compare the drag models at low velocity. Further simulations at high velocity are also studied. At last, the nonlinear scaling method was verified by an example at high velocity.It shows that VDM is far from satisfactory at high velocity. The scaling conditions of VDM are too strict to use in practice. CDM is workable only in high velocity condition which satisfies conditions of linear scaling method (LSM) in nature. But it is worthless when the velocity is less than about 0.5 km/s. Although a bit complex, IDM is very accurate at any condition. Coefficient α in IDM should be taken considering different test conditions. Scaling relationships of IDM could not be derived at low velocity due to nonlinearity. While at high velocity, IDM could be simplified to CDM and realize LSM. Further research indicates that IDM could use the scaling method directly and realize approximate LSM at high velocity. Due to the work range of the solid armature is usually 1~2km/s, nonlinear scaling method could be used in a railgun with IDM. What should be noted is that the velocity scaling factor must be controlled above about one quarter to avoid the nonlinear field. A detailed analysis of the experiments and simulations will be presented in this paper.

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“…The scaling method is widely used in all areas of engineering design, such as the aerodynamic [3] , power electronics equipment [4,5,6] , architectures [7] and railgun [8,9,10] . Coil gun is not an exception.…”

Section: Introductionmentioning

confidence: 99%

Coil gun scaling relationships

Zhang

Ruan

Liu

2009

2009 IEEE 6th International Power Electronics and Motion Control Conference

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Sub-scale system's test results and the experiences gained during the fabrication and testing can be extremely valuable for success with the full scale system. This publication focuses on the Coilgun scaling relationships between the full and sub-scaled systems' variables. Derivations of the scaling relationships presented are based upon the current filament model and momentum differential equations. A numerical study based on current filament model was then undertaken to assess whether the variables characteristics can be examined through a subscale experiment. It is shown that if the scale factors of the gun dimensions, the capacitance initial voltage are chosen properly the variables of the two systems can be scaled linearly. The peak values are scaled and their distribution characteristics are unchanged. With the proposed linear scaling method a wide range of different scalings is possible. A detailed derivation and numerical validation are presented in this paper.

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Energy Partition and Scaling Issues in a Railgun

Cited by 23 publications

References 11 publications

Application based general scaling in railguns

Application based general scaling in railguns

Nonlinear scaling study of a railgun

Coil gun scaling relationships

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