Progress in Electromagnetic Launch Science and Technology

Fair, H.D.

doi:10.1109/tmag.2006.887596

Cited by 102 publications

(27 citation statements)

References 30 publications

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“…The axial component of magnetic density inside coil creates the induced current inside projectile, which interact with radial component of magnetic field density [3,4]. The induced current depends by rate of change of the axial magnetic density and the radial magnetic flux density depends by amount of magnetic flux.…”

Section: Fig 2 Induction Coilgunmentioning

confidence: 99%

Halbach Array Launch System

Gherman¹

2016

Review of the Air Force Academy

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Section: Fig 2 Induction Coilgunmentioning

confidence: 99%

Halbach Array Launch System

Gherman¹

2016

Review of the Air Force Academy

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“…The magnetic circuit creates also a zone where the magnetic field is radial on conductor, in our case a ring (figure 3) [7]. The E shaped design use the soft magnetic materials and use the Lorentz force to accelerate projectiles but that design does not allow to control the difference of phase between induced current in projectile and the phase of the radial magnetic flux density r B  [8]. We can name this design a magnetic flux density based EMLS.…”

Section: Fig 2 Induction Coilgunmentioning

confidence: 99%

A Theoretical Approach of a New Electromagnetic Launch System

Gherman¹,

Pearsică²,

Strimbu³

et al. 2016

Review of the Air Force Academy

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“…According to the method described in reference [12], scaling relationships of equation (2) could be written as: 2 2…”

Section: Drag Force Scale Factormentioning

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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Progress in Electromagnetic Launch Science and Technology

Cited by 102 publications

References 30 publications

Halbach Array Launch System

Halbach Array Launch System

A Theoretical Approach of a New Electromagnetic Launch System

Nonlinear scaling study of a railgun

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