Comprehensive Electromagnetic Protection Method of Radio Fuze for Electromagnetic Railgun

doi:10.12382/bgxb.2023.0944

Abstract

Abstract:

The transient strong magnetic field environment in the bore during the launch of electromagnetic railgun can lead to the induced current in the radio fuze circuit, which affects the normal operation of fuze. Therefore, the shielding and protective measures need to be taken for the reliable operation of fuze. Based on Faraday’s law of electromagnetic induction, a comprehensive electromagnetic protection method is proposed for the radio fuze of electromagnetic railgun. A high permeability material shell is used for magnetic shielding to reduce the magnetic induction intensity of fuze circuit, and the rate of change in the magnetic induction intensity of fuze circuit is reduced by utilizing the eddy current effect of high conductivity material. The fuze circuit area is reduced by optimizing the circuit design, and the dot multiplication between the fuze circuit and the magnetic field is reduced through circuit board layout. The finite element model of radio fuze in the strong magnetic field environment of electromagnetic railgun is simulated and analyzed. The results show that the comprehensive electromagnetic protection method is effective. The research results can be used for reference in the design of radio fuze of electromagnetic railgun in the future.

Key words: electromagnetic railgun, wireless fuze, magnetic induction intensity, induced electromotive force, electromagnetic protection

CLC Number:

TJ43＋4.1

WEN Ruihu, LI Ping, HUANG Zheng, WANG Haibin, LI Pengfei. Comprehensive Electromagnetic Protection Method of Radio Fuze for Electromagnetic Railgun[J]. Acta Armamentarii, 2024, 45(11): 3833-3840.

Figures/Tables 19

Fig.1 Schematic diagram of electromagnetic railgun

Fig.2 Three-dimensional transient electromagnetic simulation model

Fig.3 Excitation current

Fig.4 Schematic diagram of radio fuze of electromagnetic railgun

Fig.5 Distribution of magnetic field in different positions (0.001s)

Fig.6 Magnetic induction intensity-time curves at different distances from armature

Table 1 Magnetic induction intensities at different distances from armature at different times T

时间/ms	距离电枢位置/mm
时间/ms	0	10	60	260	500
0.1	10.70	7.21	1.48	0.56	0.20
0.4	19.55	13.17	2.72	1.03	0.37
2.0	20.20	13.54	2.85	1.09	0.41
3.5	7.53	5.01	1.09	0.46	0.21

Fig.7 Schematic diagram of electromagnetic induction

Fig.8 Magnetic shielding diagram

Fig.9 Comparison of magnetic shielding effectivenesses of materials with different permeabilities

Fig.10 Comparison of magnetic shielding effectivenesses of different thicknesses

Tab.2 Shielding effectivenesses of low carbon steels with different thickness

参数	屏蔽层厚度/mm
参数	1	2	3	4	5
磁感应强度峰值/mT	34.2	18.18	12.54	9.65	7.91
磁屏蔽效能/dB	25.3	31.7	35.3	37.9	39.9

Fig.11 Change curves of magnetic induction intensity after shielding with different conductivity materials

Fig.12 Change rate of magnetic induction intensity after shielding with different conductivity materials

Fig.13 Variation curves of magnetic induction intensity after shielding with different thicknesses of good conductor materials (copper)

Fig.14 Schematic diagram of reducing the magnetic flux passing through fuze circuit

Fig.15 Influence of circuit area on induced electromotive force

Fig.16 Schematic diagram of dot multiplication between fuze circuit and magnetic field

Fig.17 The influence of the angle between fuze circuit and magnetic field on the induced electromotive force

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