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卫星上某些介质结构会遭遇较大范围的温度变化,其电导率会随之出现数量级的变化,这将显著影响内带电结果.受限于电导率-温度模型和内带电三维仿真工具,该温度效应远没有得到深入研究.为此,在真空变温(253—353 K)和强电场(MV/m量级)条件下测试了某种星用改性聚酰亚胺介质的电导率,借鉴Arrhenius电导率-温度模型并考虑强电场下电导率的增强效应,发现电导活化能取值为0.40 e V时,可得到良好的拟合结果.在此基础上,同时考虑辐射诱导电导率,采用地球同步轨道恶劣电子辐射能谱,对该类介质盘环结构进行内带电三维仿真,发现其内带电程度随温度降低而显著增加,带电最严重的区域位于靠近辐射源的接地面边线.温度低于250 K时,2 mm屏蔽铝板下该区域的场强可达到107V/m量级,发生介质击穿放电的可能性较大.所讨论的电导率-温度模型与内带电三维建模方法对进一步评估卫星介质结构内带电程度和做好防护设计具有重要参考意义.
Some media structures on satellites suffer from a wide range of temperature changes, and their conductivity changes with orders of magnitude, which will significantly affect the in-band results. Due to the conductivity-temperature model and the in-band 3D simulation tool, The temperature effect has not been further studied.For this reason, the conductivity of some star-modified polyimide was tested under the conditions of vacuum temperature change (253-353 K) and high electric field (MV / m) Arrhenius conductivity-temperature model and taking into account the enhancement effect of the conductivity under strong electric field, it is found that a good fitting result can be obtained when the conductance activation energy value is 0.40 e V. On this basis, considering the radiation-induced conductivity, Earth’s geosynchronous orbital harsh electron radiation energy spectrum, the dielectric ring structure of the inner dielectric three-dimensional simulation and found that the degree of its charged with the temperature decreased significantly increased the most charged area is located near the edge of the radiation source ground surface temperature is low At 250 K, the field strength of this region under the 2 mm shield aluminum plate can reach the magnitude of 107 V / m, and there is a high possibility of dielectric breakdown discharge. The proposed conductivity-temperature model and the three-dimensional modeling method Enter one It is of important reference significance to assess the degree of charge in the satellite medium structure and to make the protection design.