考虑温度梯度的卫星外露介质深层充电

发布时间：2018-02-02 18:03

  本文关键词： 外露介质 温度梯度 介质深层充电 地球同步轨道 Geant 充电模型　出处：《高电压技术》2016年05期 　论文类型：期刊论文

【摘要】：卫星外露介质因热导率低而在光照面与背光面之间存在温度梯度,这将影响介质电导率继而影响深层充电过程。为此,建立了考虑温度场的介质深层充电模型,针对1维模型给出了数值求解方法并进行了验证。模型的温度梯度效应是通过介质电导率对温度的依赖关系而体现的。以聚酰亚胺介质为代表,通过试验测试和数值拟合得到了253~353 K温度范围内的介质本征电导率,并根据经验公式从Geant 4计算的辐射剂量率获取了辐射诱导电导率。计算结果表明:温度梯度会对深层充电产生显著影响;在地球同步轨道恶劣电子辐射环境下,对于3 mm厚背面接地聚酰亚胺平板,当最低温度263 K出现在背面时,电场强度峰值超过10 MV/m,表面电位超过-10 k V,且随着温度梯度增加,电场强度畸变加剧,且随温度梯度而近似呈线性增长。相关结论可为介质深层充电评估提供有益参考。
[Abstract]:Because the thermal conductivity of satellite exposed medium is low, there exists a temperature gradient between the illumination surface and the backlight surface, which will affect the conductivity of the medium and then affect the deep charging process. Therefore, a dielectric deep charging model considering the temperature field is established. The temperature gradient effect of the model is reflected by the dependence of the conductivity of the medium on the temperature, represented by the polyimide medium. The intrinsic conductivity of the medium in the temperature range of 253 ~ 353K has been obtained by experimental test and numerical fitting. According to the empirical formula, the radiation-induced conductivity was obtained from the radiation dose rate calculated by Geant _ 4. The calculated results show that the temperature gradient has a significant effect on the deep charging. In the severe electron radiation environment of geosynchronous orbit, the peak electric field intensity of 3 mm thick ground polyimide plate is more than 10 MV/m when the lowest temperature of 263 K appears on the back. The surface potential is more than -10 kV, and with the increase of the temperature gradient, the distortion of electric field intensity is aggravated, and approximately increases linearly with the temperature gradient. The relevant conclusions can provide a useful reference for the evaluation of deep charge of dielectric.
【作者单位】： 军械工程学院静电与电磁防护研究所;北京卫星环境工程研究所;
【基金】：国家自然科学基金(51577190)~~
【分类号】：V442
【正文快照】： 0引言1地球内辐射带中能量约为0.1~10 Me V的带电粒子对航天器构成了长期的潜在威胁,该能量范围的电子穿透深度远大于质子[1],可以穿透卫星蒙皮,——沉积到星内孤立导体[2]或绝缘介质内部。如果沉积电荷密度足够大就会导致介质击穿放电。由CRRES(combined releaseradiation e，

本文编号：1485129