基于微扰理论的静电电子透镜的缺陷电场计算

研究了用于计算电子光学系统的缺陷电场和容差的微扰理论。基于微抗原理，推导了计算静电电子透镜由于电极偏心、倾斜和加工不圆造成的电场变化及其旁轴多极场展开函数的九点有限差分公式，编制了计算软件。建立了两个电场解析模型，通过该模型的解析解与数值计算结果的对比，证实了算法及软件的正确性，并据此讨论了微扰理论用于容差计算的适用范围。计算了几个静电电子透镜的例子，给出了不同电极缺陷的电位分布和微扰多极场分布。

复材框架结构泡沫夹芯舱门制造技术

复材框架结构泡沫夹芯舱门组件由多种次级零件叠层胶接装配,次级零件热压蠕变特性、不同叠层装配区域容差分配、工装结构细节设计都将影响舱门制造精度。为了解决这一难题,研究了厚度70mm Cascell 52WH-HT低密度泡沫芯材,在(0.25±0.02)MPa压力下热压蠕变情况,泡沫芯厚度方向较固化前出现热压蠕变比率为-0.7%,并确定了泡沫芯工艺补偿量计算方法;依据舱门气动外形面高精度指标要求,分类设计了不同叠层装配区域容差计算方法,形成了叠层装配区容差计算公式,并实践验证了理论公式可行性;结合舱门框架加强的结构特点,设计并制造了专用成型胶接夹具;采用二次胶接工艺完成复材框架结构泡沫夹芯舱门零件制造,各项指标满足工程技术要求。

A real-time fault-tolerant scheduling algorithm with low dependability cost in on-board computer system

To make the on-board computer system more dependable and real-time in a satellite, an algorithm of the fault-tolerant scheduling in the on-board computer system with high priority recovery is proposed in this paper. This algorithm can schedule the on-board fault-tolerant tasks in real time. Due to the use of dependability cost, the overhead of scheduling the fault-tolerant tasks can be reduced. The mechanism of the high priority recovery will improve the response to recovery tasks. The fault-tolerant scheduling model is presented simulation results validate the correctness and feasibility of the proposed algorithm.