EM gun scaling relationships

Yun, Heedo

doi:10.1109/20.738456

Cited by 24 publications

(8 citation statements)

References 7 publications

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“…This provides an additional degree of freedom that may be useful for studies involving changes in field magnitudes or thermal management based on surface area loss density. The corresponding scaling laws were reported in [5].…”

Section: B Dif F Usion Onl Y Scalin Gmentioning

confidence: 86%

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: B Dif F Usion Onl Y Scalin Gmentioning

confidence: 86%

Application based general scaling in railguns

Sung

Odendaal

2011

2011 IEEE Pulsed Power Conference

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“…It is not always easy if-as in railgun scaling-the governing equations impose conflicting requirements. Hsieh and Kim [8] and Yun [9] have discussed scaling relations applicable to EM launchers. It is worthwhile to discuss the pertaining scaling laws here again.…”

Section: Scaling Considerationsmentioning

confidence: 99%

Energy Partition and Scaling Issues in a Railgun

Satapathy

Vanicek

2007

IEEE Trans. Magn.

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We performed numerical simulations to characterize a conceptual naval railgun and to compute the spatial and temporal energy partitions among the kinetic, thermal, and magnetic energies. A numerical study was then undertaken to assess whether the energy partition, thermal, and kinematic characteristics can be examined through a subscale experiment. It turns out that not all field quantities can be consistently scaled, because the field equations involve both diffusion and wave equations. Three subscale cases-where displacement, velocity, and acceleration profiles were kept the same as the full-scale profiles-were considered. The velocity-matching scaling seems to provide the best case for subscale testing of thermal characteristics of a railgun. The results are expected to provide guidance for thermal management schemes and for suitable subscale tests.

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“…x , and the current scale factor K I must be equal to K x [9], [10]. The scaling relationships of LSM could be expressed as equation (1).…”

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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EM gun scaling relationships

Cited by 24 publications

References 7 publications

Application based general scaling in railguns

Application based general scaling in railguns

Energy Partition and Scaling Issues in a Railgun

Nonlinear scaling study of a railgun

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