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受到空间高能带电粒子的作用,航天器蒙皮外侧电缆束的绝缘介质会产生深层充电效应。基于介质的电流连续性方程,并利用Geant4粒子输运模拟和辐射诱导电导率公式分析了介质深层充电的物理过程。在地球同步轨道(GEO)恶劣电子环境下,对外露电缆束介质结构深层充电进行三维仿真分析。结果表明:深层充电导致介质结构带20 V以内负电位,电位和电场强度峰值分别出现在电缆束外圈电缆介质层的外侧与内侧;对于导线介质层厚度为0.19 mm的情况,各介质层间是否紧密邻接和电缆束包含电缆根数多少对充电峰值结果影响不大;捆缚电缆的条状介质块是发生放电的危险区域,介质块厚度为0.8 mm时,充电电位在-103 V量级,电场强度可达到4×106 V·m-1,且电场强度与电位随介质块厚度增加而显著增大。
Due to the role of space-energetic charged particles, the insulating medium on the outer cable harness of the spacecraft skin produces a deep charging effect. Based on the current continuity equation of the medium, the physical process of deep charge of the medium was analyzed by using Geant4 particle transport simulation and radiation induced conductivity formula. Under the geo-geosynchronous orbital (GEO) harsh electronic environment, deep simulation of the exposed cable bundle dielectric structure is carried out. The results show that the deep charge leads to the negative potential within 20 V of dielectric structure and the peak of electric potential and electric field appears outside and inside of the outer cable dielectric layer of the cable bundle respectively. For the case that the thickness of the dielectric layer is 0.19 mm, The tightness of adjacent cables and the number of cables containing cables have little effect on the peak results of charging. The stripe-shaped dielectric blocks bundled with cables are hazardous areas where discharge occurs. When the dielectric block thickness is 0.8 mm, the charge potential is on the order of -103 V , The electric field strength can reach 4 × 106 V · m-1, and the electric field strength and potential increase significantly with the increase of dielectric bulk thickness.