河北师范大学学报—

期刊信息

刊名：河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
主办：河北师范大学
ISSN： 1000-5854
CN： 13-1061/N
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非均匀温度分布对航天器内带电的影响

（陆军工程大学石家庄校区电磁环境效应重点实验室，河北石家庄 050003）
DOI： 10.13763/j.cnki.jhebnu.nse.202102019

Analysis of the Effect of Non-uniform Temperature Distribution on Spacecraft Internal Charging

YUAN Qingyun,SUN Yongwei,ZHANG Xijun,WANG Pingping,CHEN Dong

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摘要/Abstract

摘要：

内带电是引起航天器故障的重要原因之一，温度分布会造成航天器介质电导率变化进而影响内带电水平. 为了研究环境温度变化对航天器介质材料内带电特性的影响，利用所建立的本征电导率模型，以航天器内部电路板介质材料为研究对象，研究了电路板正面接地和背面接地条件下，非均匀温度分布对电路板内带电的影响规律. 研究得出：在地球同步轨道恶劣高能电子辐射下，相同温度分布时，背面接地较正面接地内带电更加严重；降低接地点的温度会加剧内带电的严重程度；背面接地且负向温度梯度得到的场强峰值最大，是最严重的充电情况，当背面温度低至153 K时，电场强度峰值达到1. 5 MV/m，表面电位峰值超过-2 kV，存在较大的放电风险；在背面接地且正向温度梯度或者正面接地且负向温度梯度情况下，场强峰值均出现在介质内部，这是区别于均匀温度分布下内带电结果的重要特征. 研究成果可为航天器内带电评估提供理论依据.

Abstract：

Internal charging is one of the important causes of the fault of the spacecraft. The temperature distribution can cause the change of the spacecraft′s dielectric conductivity and affect the internal charging level. In order to study the influence of ambient temperature change on the characteristics of the spacecraft internal charging, the effects of temperature on the intrinsic conductivity and the radiation-induced conductivity are studied by using the new formula of the intrinsic conductivity. Based on the internal printed circuit board (PCB) of the spacecraft, the effect the non-uniform temperature distribution on PCB internal charging is studied under the condition of back grounding and front grounding. It is concluded that under the energetic electron flux of geosynchronous orbit (GEO) serious radiation, the internal charging level in back grounding is more serious than that in front grounding at the same temperature distribution. Decreasing the temperature at the grounding point will increase the internal charging, the peak value of the electric field is the maximum in the back grounding and the negative temperature gradient, and it is the most serious charging. When the back grounded temperature is 153 K, the peak value of the electric field is 1. 5 MV/m, and the peak value of the potential exceeds -2 kV. Then, there is a high risk of discharge, in the case of the back grounding and the positive temperature gradient or the front grounding and the negative temperature gradient, the peak value of the electric field occurs inside the dielectric, which is the important characteristic of internal charging results differing from the results in the uniform temperature distribution. These results could provide a theoretical basis for the assessment of the spacecraft internal charging.

关键词

关键词： 内带电；非均匀温度分布；辐射剂量率；电导率；电位

Key words： internal charging ; non-uniform temperature distribution ; radiation dose rate ; conductivity ; potential

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