In-Bore Dynamic Measurement and Mechanism Analysis of Multi-Physics Environment for Electromagnetic Railguns

Yuxin Yang,Keren Dai,He Zhang,Qiang Yin,Haojie Li,Da Yu,Peng Liu

doi:10.1109/access.2021.3053255

Yuxin Yang, Keren Dai + Show 5 more

Open Access

https://doi.org/10.1109/access.2021.3053255

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Journal: IEEE Access	Publication Date: Jan 1, 2021
Citations: 28	License type: CC BY 4.0

Affiliation: Nanjing University of Science and Technology

Abstract

Electromagnetic launch technology has important applications in many fields. However, the extremely harsh multi-physics environment during the launch is quite different from that of conventional guns. Little experimental research studied the dynamic distribution of the extreme impact environment and magnetic fields in the projectile. To this end, this paper designs a projectile-borne storage testing system for the dynamic measurement of harsh multi-physics environments. The detailed assessment of the measured dynamic multi-physics field shows that the velocity skin effect (VSE) is an important factor affecting the dynamic results. It causes a higher current density in the armature, and the magnetic induction and acceleration in the dynamic experiment are lower than those in the static-based experiment and simulation. Moreover, it causes the concentrated heat on the trailing edge of the armature, which lead to the melt-wave erosion, even affects the movement of integrated projectile during launch. Furthermore, the physical mechanism behind these phenomenon is revealed, and the causes of muzzle velocity error are analyzed. In conclusion, a feasible, dynamic measurement method for multi-physics coupled environments is presented, which can provide references for follow-up modeling and simulation researches and promote the development of railguns.

Highlights

As a new concept weapon, the electromagnetic railgun exhibits a higher muzzle kinetic energy
The results show that the velocity skin effect (VSE) resulting in a decrease of magnetic induction, magnetic induction rate, acceleration and velocity, with a maximum error of 40%
This paper studies the coupling effect of a multi-physics environment in the electromagnetic launching process, and designs a projectile-borne storage testing system for railgun testing

Summary

INTRODUCTION

As a new concept weapon, the electromagnetic railgun exhibits a higher muzzle kinetic energy. The strong magnetic field, high-g impact, and high temperature interact with each other and create a harsh environment This threatens the reliability of the electronic system in the projectile [3] and affects the fuze. This paper designs a projectile-borne storage testing system to study the coupling relationship between the mechanical and electromagnetic fields during the launch. DESIGN OF PROJECTILE-BORNE STORAGE TESTING SYSTEM The electromagnetic launching system as shown in Fig. 1 is mainly composed of a high-power supply, pulse forming unit (PFU), rails, integrated projectile (armature and projectile), and recovery package [15]. The harsh multi-physics environment can cause the failure of the lithium battery [17] In order to verify the stability and reliability of the testing system, the mapping relationship between shielded and unshielded magnetic induction is studied by using Gaussian process regression, as shown in Fig. 3c. (The detailed calibration method is given in the Supplementary material sec.1.)

ANALYSIS OF DYNAMIC EXPERIMENT

EFFECT OF VSE

Findings

CONCLUSION