A Layer Counting Method for Penetration Fuze Based on Magnetic Anomaly Detection

doi:10.12382/bgxb.2022.0645

Abstract

Abstract:

The traditional acceleration sensor detection method has the problems of signal oscillation aliasing, serious sticking and difficult accurately to count the layers when the penetrators penetrate multi-layer buildings. An accurate layer counting method for penetration based on the magnetic anomaly detection (MAD) is proposed. The steel bars in the buildings will influence the distribution of the surrounding geomagnetic field. When the fuze penetrates a target with the warhead, the magnetic sensor is used to detect the magnetic anomaly signal (MAS) generated by the geomagnetic field distortion around the floors, so as to complete the state identification of penetration. The magnetic field simulation models of a multi-layer reinforced concrete target and a projectile penetrating multi-layer target are established. The distribution characteristics of magnetic field around the floors and the variation law of magnetic field intensity of fuze during penetration are obtained. The effects of oblique penetration, steel bar density and projectile material on the magnetic signal changes during penetration are analyzed. It is found that there is a clear corresponding relationship between the amplitude of magnetic signal and the position of floors during penetration, and the signal characteristics are obvious. The lower relative permeability of projectile material and the higher density of steel bars in the target are more conducive to the signal processing of magnetic detection. Finally, a MAD experiment is designed and carried out in the laboratory. The experimentl results show that the MAS is clear and easy to be distinguished during penetration, and the principle is proved to be feasible.

Key words: penetrator, fuze, magnetic anomaly detection, layer counting, simulation analysis

CLC Number:

TJ43⁺1.6

WANG Yili, LI Changsheng, WANG Xin, ZHANG He, WANG Xiaofeng. A Layer Counting Method for Penetration Fuze Based on Magnetic Anomaly Detection[J]. Acta Armamentarii, 2024, 45(3): 695-704.

Figures/Tables 20

Fig.1 Schematic diagram of MAD-based penetration layer counting

Fig.2 Geometric model of target

Fig.3 Distribution of magnetic field around the target

Fig.4 Cross section of projectile in uniform magnetic field

Fig.5 Schematic diagram of projectile in geomagnetic field

Fig.6 Distribution curve of magnetic flux density along the central axis of projectile

Fig.7 Co-simulation model

Table 1 Parameters of simulation materials

名称	材料	相对磁导率
弹体	Iron alloys	200
引信	Aluminum	1
底螺	Aluminum	1
混凝土	Concrete	1
钢筋	Structural steel	700
分析域	air	1

Fig.8 Change of magnetic field intensity during target penetration

Fig.9 Change trend of magnetic signal and overload signal during penetration

Fig.10 Model diagram of actual working condition

Fig.11 Comparison of magnetic signals under different working conditions

Fig.12 Co-simulation model of oblique penetrating into three-layer reinforced concrete target

Fig.13 Comparison of magnetic signals under normal and oblique penetrations

Fig.14 Comparison curves of magnetic field distribution under the condition of differentsteel bar densities

Fig.15 Comparison curves of magnetic signal changes under the condition of different projectile materials

Fig.16 Principle block diagram of MAD circuit

Fig.17 Magnetic detection device

Fig.18 Overall experimental model

Fig.19 z-axis test waveform

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