### 航天器介质盘环结构内带电特性三维仿真分析

1. 1. 陆军工程大学 电磁环境效应国家级重点实验室, 石家庄 050003;
2. 63618部队, 库尔勒 841000
• 收稿日期:2019-03-29 修回日期:2019-04-17 出版日期:2019-09-15 发布日期:2019-05-07
• 通讯作者: 原青云 E-mail:qingyuny1979@163.com
• 基金资助:
国家自然科学基金（51577190）；电磁环境效应重点实验室基金（614220501020117）

### 3-D simulation of internal dielectric charging characteristics of spacecraft dielectric disc structure

YUAN Qingyun1, WANG Song2, HUANG Xinxin1

1. 1. National Key Laboratory on Electromagnetic Environment Effects, Army Engineering University of PLA, Shijiazhuang 050003, China;
2. Unit 63618, Kuerle 841000, China
• Received:2019-03-29 Revised:2019-04-17 Online:2019-09-15 Published:2019-05-07
• Supported by:
National Natural Science Foundation of China (51577190); National Key Laboratory on Electromagnetic Environment Effects Foundation (614220501020117)

Abstract: For the Internal Dielectric Charging (IDC) of a particular spacecraft structure, in this paper, a 3-D IDC simulation is performed to a typical spacecraft complex dielectric structure——Solar Array Drive Mechanism (SADM) disc——considering the Geostationary Earth Orbit (GEO) with severe radiation environment (Flumic3). A charge transportation simulation is carried out by Geant4 and the electric field is numerically computed according to the charge conservation law. Based on those, the effects of shielding thickness on internal dielectric charging is studied, and a technique is proposed to improve the simulation efficiency by adjusting the lower energy limit of the incident electron spectrum according to the shielding thickness. The simulation results show that the most serious internal charging position occurs on the top edge of the contact face between the outermost upper layer dielectric of the disc structure and the metallic conducting ring. The increment of the shielding thickness could mitigate IDC. However, this mitigation effect is weaker as the temperature is falling. In the GEO with severe radiation environment (Flumic3), at temperature of 183 K, since the radiation-induced conductivity dominates the total conductivity, the dielectric conductivity will be cut down as the shielding thickness is increased. In this case, even using a 3 mm aluminum shielding, the peak electric field can reach the level of 107V/m.
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