【作者】 李小江；

【导师】 贾建援；

【作者基本信息】 西安电子科技大学 ， 机械电子工程， 2009， 硕士

【摘要】 空间等离子体是影响各类航天电子设备的工作性能、使用寿命、工作可靠性的主要复杂电磁环境之一,它能通过充放电效应对电子设备造成干扰甚至破坏,是各类航天电子设备必须加以预防和克服的主要空间环境因素之一。本文立足于本专业的相关理论基础,结合经典等离子体理论、鞘层理论、电动力学理论以及现有的研究成果,提出了从时域角度研究空间等离子体对电子设备充放电效应的思路,分析推导了空间等离子体对电子设备充放电效应的时域特征:(1)在不考虑空间磁场影响的情况下,基于等离子体鞘层理论、Boltzmann-Maxwell方程,建立了一维空间等离子体对电子设备的充电模型,引入了时域特征变量和空域特征变量分离的空间等离子体鞘层动力学方程组。采用逆解析法求解空间等离子体鞘层动力学方程组,得出了合理的空间等离子体对电子设备充电的时域特征解;(2)根据典型的可引发危害性效应的空间等离子体环境参数,计算分析了电子设备被充电可达到的最大电位及充电时间。结合航天器的飞行速度,对航天器在空间等离子体中的充电时间和航天器进入空间等离子体所需的飞行时间作了分析比较,进一步说明了电子设备的失效或破坏是由充电时间差、电位差引起的;(3)分析了空间等离子体三种不同参数对电子设备的最大充电电位和充电时间的影响;(4)结合电子设备常见的接地方式,分析了在不同的接地方式下,电子设备被空间等离子体充电至最大电位后的放电机理。希望本文能为电子设备预防空间等离子体的充放电现象提供一定的借鉴和参考。更多还原

【Abstract】 Space plasma is one of the main complex electromagnetic environments, which makes effects on the performance, operational life span and operational reliability of space electronic equipments. It makes disturbances even damages on them by so-called charging and discharging effect. So it must be prevented and overcame by all space electronic devices.This thesis stands on the correlated theories of my profession and at the same time makes use of classical theories such as plasma, plasma sheath and electrodynamics, proposes the idea of researching the space plasma‘s charging-discharging effect on electronic equipments, studyes the character in the time domain of the charging and discharging effect of space plasma on the electronic equipments:(1) On the condition of without considering the effect of space magnetic field and based on the plasma sheath theory and Boltzmann-Maxwell equations, a charging model of space plasma to electronic equipments in one-dimensional space was build. a space plasma sheath dynamic equations which includes the time variable and the space variable and the two variables are separated was introduced。This paper solved the space plasma sheath dynamic equations by the inverse analytical method and acquired a reasonable time domain solution of space plasma charging to the electronic equipments;(2) Basing on typical space plasma parameters which can cause harmful charging and discharging effect, the paper calculated the highest charging voltage and charging time。Combing with the flight speed of the spacecrafts in cosmos, an analysis was made between the charging time and the fly time when the spacecrafts fly into space plasma environment, which further proved the electronic equipments` failures or damage is caused by the Charging time difference and the potential difference;(3) The paper analyzed respectively the influence of the variation of three different parameters of space plasma to the highest electric potential and the charging time of the electronic equipments be charged, and got the relations between the space plasma parameters and the charging time;(4) Combined with electronic equipments’ common grounding methods, the paper analyzed the discharged mechanism of the electronic equipments in different grounding way when the discharging phenomenon occurs。The author hopes this paper could provide necessary references for prevent the disturbances and damages of space plasma to electronic equipments.更多还原