Efficiency Analysis of an Electromagnetic Railgun With a Full Circuit Model

He, Yuan; Guan, Yongchao; Gao, Guishan; Li, Yexun; Xu, Quan; Wei, Bing; Song, Seungwoo

doi:10.1109/tps.2010.2082567

Cited by 22 publications

(7 citation statements)

References 9 publications

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“…The CDM at high velocity has been verified by reference [6]. It is a good case for us to compare the VDM and IDM.…”

Section: B Comparison Results In High Velocity Casesmentioning

confidence: 65%

“…Some people attempted to attribute friction, erosion, transition and other factors that obstruct the armature from going forward into a drag model. They argued that a railgun with proper drag model is accurate enough to simulate the movement property [6]. It seems to be feasible for the reasons as follows.…”

Section: A Drag Of a Railgunmentioning

confidence: 99%

“…The CDM assumes that the drag force on the armature just depends on the working current [6] which could be written as:…”

Section: B Drag Model Associated With Current (Cdm)mentioning

confidence: 99%

“…The drag force in VDM is very small because of low velocity and thus muzzle time is also less than experiment. The CDM adopted the same L' a as reference [6]. But the results were not favorable.…”

Section: A Experiments With Low Velocitymentioning

confidence: 99%

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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 CDM at high velocity has been verified by reference [6]. It is a good case for us to compare the VDM and IDM.…”

Section: B Comparison Results In High Velocity Casesmentioning

confidence: 65%

Section: A Drag Of a Railgunmentioning

confidence: 99%

“…The CDM assumes that the drag force on the armature just depends on the working current [6] which could be written as:…”

Section: B Drag Model Associated With Current (Cdm)mentioning

confidence: 99%

Section: A Experiments With Low Velocitymentioning

confidence: 99%

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Nonlinear scaling study of a railgun

Zhang

Ruan

Liao

et al. 2012

2012 16th International Symposium on Electromagnetic Launch Technology

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“…The initial parameters primarily include charged voltage of capacitors, mass of armature, and starting position (virtual length for acceleration). The effects of the variation of initial parameters can be estimated by a full circuit model [6]. The dynamic parameters are assumed to change with armature position, expressed as x 0 f ( p), where p is the distance between the armature's position and the starting position.…”

Section: Effects Of Initial and Dynamic Parameters On Muzzle Velomentioning

confidence: 99%

An Investigation Into Muzzle Velocity Repeatability of a Railgun

Song

Guan

et al. 2015

IEEE Trans. Plasma Sci.

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Muzzle velocity repeatability of electromagnetic railgun has been identified as a potential development issue for several years. The muzzle velocity is sensitive not only to initial parameters, such as charged voltage of capacitors, mass of armature, and starting position, but also to dynamic parameters, such as electric contact resistance and friction between the armature and rails. This paper analyzes the effects of initial and dynamic parameters on muzzle velocity. It is found that the most sensitive parameter is the charged voltage of capacitors. A series of two 20-shot bursts was performed with two sets of rails, respectively. The details of the experimental setup and velocity measurement are described. The maximum deviation of the muzzle velocity is 3.8% with 8.47-g armatures at a mean velocity of 1913 m/s in the first 20-shot burst, and 0.92% with 10.50-g armatures at a mean velocity of 2373 m/s in the second 20-shot burst. It indicates that the greater armature mass and larger contact area probably advance the repeatability of the railgun muzzle velocity. The effects of rail current and muzzle voltage on repeatability are discussed. The relations between repeatability of the muzzle velocity and the rail current and/or muzzle voltage are not obvious.

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Research on Electromagnetic Protection Characteristics of Vehicle-mounted Electromagnetic Railgun Launcher Lifetime Counting Device

Jin

Fan

Zhong

et al. 2023

J. Phys.: Conf. Ser.

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When the vehicle-mounted electromagnetic gun is launched, the vehicle body is subjected to strong arc reaction, magnetic field interference and shock wave phenomenon. By establishing the external magnetic field model of the multi-tube launch chamber, the electromagnetic protection characteristics of the vehicle-mounted electromagnetic gun launcher’s full-life counting device are studied, and the magnetic field characteristics during launch are analyzed by COMSOL software, and the distribution position of the counting device is selected. Then, based on the electromagnetic shielding technology, conduct anti-interference technology research on the counting device, adopt the method of combined shielding, compare and analyze the shielding effectiveness of each shielding body, and propose the best shielding scheme. The life counting device works safely and normally. Therefore, the research method in this paper can provide an electromagnetic shielding scheme for the anti-jamming technology of the remaining electronic equipment of the vehicle-mounted electromagnetic gun, and can provide guidance for the design of the vehicle-mounted multi-barrel electromagnetic gun launching system.

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Efficiency Analysis of an Electromagnetic Railgun With a Full Circuit Model

Cited by 22 publications

References 9 publications

Nonlinear scaling study of a railgun

Nonlinear scaling study of a railgun

An Investigation Into Muzzle Velocity Repeatability of a Railgun

Research on Electromagnetic Protection Characteristics of Vehicle-mounted Electromagnetic Railgun Launcher Lifetime Counting Device

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