Study on the curve shape of C-shaped armature's trailing arms in rectangular bore railgun

Deng, Fangfang; He, Junjia; Chen, Lixue; Xia, Shengguo; Xiao, Zheng; Li, Jun; Yan, Ping

doi:10.1109/eml.2012.6325118

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…Various armature structures have been proposed in the development history of electromagnetic railguns: block armature, brush armature, layered armature, C-shaped armature, etc., and the C-shaped armature is commonly used at present [39]. Many studies have optimized the structural parameters such as armature arm length, tail thickness, and tail inclination of C-shaped armatures to improve contact pressure and current density distribution to enhance contact performance [41][42]. Several factors must be considered in armature design, including mechanical design, current distribution, heat and mass minimization.…”

Section: Structural Design Of Armature and Railsmentioning

confidence: 99%

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

2023

J. Phys.: Conf. Ser.

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The analysis of the sliding electrical contact characteristics between the armature and rails is an important research area for electromagnetic railguns. In this paper, a sliding electrical contact model considering non-ideal factors is introduced, the magneto-thermal coupling characteristics of the contact interface are summarized, and the current and temperature distribution characteristics are outlined. In the end, measures that can be taken to improve the contact performance are presented in terms of armature rail material selection and structural optimization.

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Section: Structural Design Of Armature and Railsmentioning

confidence: 99%

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

2023

J. Phys.: Conf. Ser.

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“…In this section, a C-type armature, which is the most common solid armature, is used for research [20]. Considering the diffusion effect of the current in the armature, the halved C-type armature is divided into five regions for calculation as shown in Fig.…”

Section: Calculation Model Of Magnetic Induction For the Armature And...mentioning

confidence: 99%

The Influence of projectile shielding on the internal magnetic field during an electromagnetic launch

Yang¹,

Liu²,

Li³

et al. 2022

J. vibroeng.

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Compared with a conventional propulsion system, an electromagnetic railgun is characterized by an in-bore pulsed high magnetic field. However, the dynamic distribution of the magnetic field in the projectile has rarely been experimentally studied. To this end, this paper discusses the possibility of utilizing magnetic field environment information. An equivalent model of an electromagnetic railgun is established by using the finite element method. Based on the magnetic diffusion equation and the Biot-Savart law, the in-bore magnetic induction is determined. The velocity skin effect and projectile shielding are considered in the model. Furthermore, the magnetic measurement method is presented to validate a simulation result. The results obtained from the simulation and experiment show that package shielding affects the pulse width and amplitude of the internal value. The peak magnetic induction of low carbon steel and copper is reduced by 33.6 %, and the pulse width lags by 2.7 ms. Moreover, projectile shielding has a substantial influence on the timing accuracy during launch, and the time error reaches approximately 18 %. Therefore, the in-bore magnetic field is a practical signal for the control module since it considers the influence of different projectile shields.

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“…Due to armature geometry, material behavior, and asperities in material surfaces, the initial contact pressure in the armature-rail interface is typically localized and poorly distributed across the armature flange contact surface. This is especially the case for rectangular bore railguns [4].…”

Section: Introduction and Identification Of Problemmentioning

confidence: 97%

“…Researchers have investigated many different methods to control the contact pressure and distribute it across larger areas [4], [9]. The most direct method to control the contact pressure distribution is to alter the armature's flange geometry.…”

Section: Introduction and Identification Of Problemmentioning

confidence: 99%

Improving Start-Up Contact Distribution Between Railgun Armature and Rails

Hric

Odendaal

2016

IEEE Trans. Plasma Sci.

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Contact pressure between the armature and rails of a railgun is critical to rail lifetime, armature acceleration, and consistent shot behavior. A zero-velocity contact is provided by the mechanical strain of the armature flange in interference with the rails. The contacting surfaces of the armature typically have unpredictable, localized concentrations of contact pressure and areas with no contact pressure at all. A method to improve contact distribution and maintain control of the total contact force magnitude is introduced in this paper. This technique, called the predicted displacement method (PDM), showed promising results on simple model geometries and successfully demonstrated its ability to improve the design of a solid C-shaped railgun armature. The simulation results also illustrated the PDM's ability to scale contact force magnitude while preserving the improved pressure distribution.

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Study on the curve shape of C-shaped armature's trailing arms in rectangular bore railgun

Cited by 4 publications

References 6 publications

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

The Influence of projectile shielding on the internal magnetic field during an electromagnetic launch

Improving Start-Up Contact Distribution Between Railgun Armature and Rails

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