Research on Armature Thrust Inductance Gradient of the Electromagnetic Rail Launcher

Zhai, Xiaofei; Liu, Hua; Peng, Zhiran

doi:10.1109/tps.2022.3147045

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…, Ay, vy and vz, Equation ( 1) is written as follows [11]: Ignoring the displacement current, the diffusion equations of armature and track can be deduced by using the A-ϕ method as follows:…”

Section: Governing Equationmentioning

confidence: 99%

“…When the launcher is working, the magnetic induction intensities cancel each other out in the direction z and there is only a component in the direction y, so A has components only in the directions x, z and v only in the direction x. Therefore, ignoring ∂A x ∂y , ∂A z ∂y , A y , v y and v z , Equation ( 1) is written as follows [11]:…”

Section: Governing Equationmentioning

confidence: 99%

“…Yang et al [10] analyze the distribution of the inductance gradient with current frequency. Zhai et al [11] consider the velocity skin effect and calculated the dynamic inductance gradient by introducing a velocity frequency. Peng et al [12] propose an analytical calculated method for the inductance gradient which comprehensively considers the influence of the guide track size and current diffusion.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Verification of Electromagnetic-Thermal Coupling for Electromagnetic Track Launch Considering the Dynamic Conductivity

Yan,

Jiang,

Yang

et al. 2023

Applied Sciences

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In order to solve the problems of insufficient precision of the armature velocity and inductance gradient in the process of finite element calculation of the electromagnetic track launcher, an improved dynamic conductivity electromagnetic-thermal coupling model is proposed to make the calculated results closer to the actual working condition. Firstly, the finite element analysis for the electromagnetic-thermal field is carried out. Then, considering the influence of dynamic conductivity on the armature velocity and inductance gradient, an improved dynamic conductivity electromagnetic-thermal coupling model based on finite element analysis is established, whose parameters are identified by the proposed PSO-GA hybrid algorithm. Moreover, the predicted values of armature velocity and inductance gradient are also obtained. Finally, the experimental platform of the electromagnetic track launcher is built to verify the improved model. By comparing the predicted value of the improved model with the experimental test value, it is found that the improved model can further reduce the calculated error from 5.79% to 1.18%, which provides a certain theoretical basis for the full true simulation of the electromagnetic track launch.

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Section: Governing Equationmentioning

confidence: 99%

Section: Governing Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling and Verification of Electromagnetic-Thermal Coupling for Electromagnetic Track Launch Considering the Dynamic Conductivity

Yan,

Jiang,

Yang

et al. 2023

Applied Sciences

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“…Stefani et al used their own electromagnetic simulation software EMAP3D to study the reversed current flow at current falling edge, but it did not take the different contact state into consideration [8]. Zhai et al proposed an equivalent principle to transform the pulsed current into a sinusoidal current of a specific frequency considering velocity, but this method cannot show the characteristics of the current diffusion simultaneously [9]. Contact pressure differences will cause ununiform contact resistance, leading to ununiform current distribution [10].…”

Section: Introductionmentioning

confidence: 99%

“…Zhai et al . proposed an equivalent principle to transform the pulsed current into a sinusoidal current of a specific frequency considering velocity, but this method cannot show the characteristics of the current diffusion simultaneously [9]. Contact pressure differences will cause ununiform contact resistance, leading to ununiform current distribution [10].…”

Section: Introductionmentioning

confidence: 99%

3D Analysis on Distribution of Pulsed Current in Electromagnetic Launcher Considering Contact State and Movement

Zhang

Liu

Tan

et al. 2023

IEEJ Transactions Elec Engng

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In electromagnetic launcher, the pulsed current is concentrated by contact state, current skin effect (CSE) and velocity skin effect (VSE), and heat the material locally. It will lead to melt or degradation, reducing stability and service life of the launcher. In order to study the current distribution with all these various influences, a 3D transient current analysis model with dynamic conductivity assignment and contact layer is proposed in this paper. It is found that the short contact length in armature moving direction can make two peaks overlap caused by CSE and VSE, and VSE can disturb the current distribution in horizontal direction. When designing armatures, it is recommended that the contact length in the moving direction should be long enough during the entire launch process, so to isolate the two peaks, and that the central length of the armature tail should be longer than the lateral length, so to prevent the current from concentrating more at the lateral edge. These conclusions help the optimization of the launcher structure to reduce local damage caused by current concentration and extend service life.

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Analysis and Experimental Verification of Contact Characteristics Between Armature and Rail Based on Dual Parameter Changes

Pei,

Cao,

Huang

et al. 2024

Lecture Notes in Electrical Engineering

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Research on Armature Thrust Inductance Gradient of the Electromagnetic Rail Launcher

Cited by 6 publications

References 12 publications

Modeling and Verification of Electromagnetic-Thermal Coupling for Electromagnetic Track Launch Considering the Dynamic Conductivity

Modeling and Verification of Electromagnetic-Thermal Coupling for Electromagnetic Track Launch Considering the Dynamic Conductivity

3D Analysis on Distribution of Pulsed Current in Electromagnetic Launcher Considering Contact State and Movement

Analysis and Experimental Verification of Contact Characteristics Between Armature and Rail Based on Dual Parameter Changes

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