红外遥感器空间制冷技术的发展现状

红外遥感技术发展的关键技术之一是解决其红外器件的制冷问题。文中通过对空间用制冷技术的分析,探讨了辐射制冷器、斯特林制冷机、脉冲管制冷器在空间中的应用和发展方向。     

空间机械臂非完整运动规划的遗传算法研究

带空间机械臂航天器系统在无外力矩作用时，系统相对于总质心的动量矩守恒而变为非完整系统。由于非完整约束的不可积性，非完整系统的运动规划与控制比一般系统要困难得多。现利用非完整特性研究了自由漂浮空间机械臂的三维姿态运动控制问题。首先导出带空间机械臂的航天器三维姿态运动数学模型，并将系统的控制问题转化为无漂移系统的非完整运动规划问题。在运动规划中，根据最优控制原理和优化理论，提出基于遗传算法的最优运动规划数值算法。通过数值仿真，表明该方法对空间机械臂及航天器三维姿态运动的非完整运动规划是有效的。     

影响间接言语行为的正确理解的因素探讨

间接言语行为的使用是日常生活中极为常见的现象,对间接言语行为的正确理解依赖于一系列语言的和语言外的因素,论文即是对这些因素的尝试性探讨。     

平板缝隙溅击喷嘴冷流混合特性

作为变推力液体火箭发动机上环形缝隙式喷嘴基本特性研究的一部分,本文研究了溅板的加入,以及溅板几何尺寸的改变对喷雾场冷流混合特性的影响。结果表明,溅板的加入改善了流强与混合比分布。溅击角的增大和合成膜在溅板上撞击线的内移不同程度地提高了E_m值。合理的设计和准确控制喷注参数可以获得满意的流强与混合比分布。     

氨电弧喷射推力器实验和数值研究

为了证实氨电弧喷射推力器良好的工作性能，对其进行了系统的实验和数值研究。在实验研究中建立了高真空实验系统、先进的小推力测量系统和恒定电流控制系统，在数值研究中采用二阶精度无波动、无自由参数的耗散差分格式(NND格式)数值求解耦合电磁源项的扩展N-S方程组。通过实验获得了不同结构尺寸的推力器不同工作条件下的工作性能，通过数值模拟给出了推力器的流场结构，预计了其推力、比冲和推进效率。研究结果表明，氨电弧喷射推力器工作性能良好，能够担负一定的空间应用任务。     

数控技术在卫星型号零件加工中的应用

文中讲述了数控加工技术在北京空间机电研究所承担的型号产品零件制造中的应用。主要涉及异形零件的编程和加工,使用参数编程的一些技巧和经验,以及使用自动编程软件在数控编程所取得的一些经验。     

声重波激发的赤道Spread—F的拓扑特性研究

本文对声重波激发的Spread-F扰动的非线性制约方程的拓扑特性进行了定性讨论和数值计算．研究了Spread-F的混沌特征及参数范围．结果表明声重波在不同条件时对Spread-F的激发作用有本质的不同．     

SPACE LIFE SCIENCE IN 2000-2001

Chinese scientists studied some of the problems in the field of space life science and achieved success in the area during 2000-2001. Space biological experi ments were carried out in the orbit and the results of ground studies on protein crystallization, space radiation, space motion sickness were introduced in this paper. The influences of simulated weightlessness on the brain-function, the car diovascular, endocrine hormones, immunity, skeletal and muscle systems were presented. In addition, gravity medicine and space environment medicine, as well as countermeasures to space deconditioning, such as the traditional Chinese medicine, were also reported.     

KuaFu Mission

The KuaFu mission-Space Storms, Aurora and Space Weather Explorer-is an "L1+Polar" triple satellite project composed of three spacecraft: KuaFu-A will be located at L1 and have instruments to observe solar EUV and FUV emissions, and white-light Coronal Mass Ejections (CMEs), and to measure radio waves, the local plasma and magnetic field,and high-energy particles. KuaFuB1 and KuaFu- B2 will bein polar orbits chosen to facilitate continuous 24 hours a day observation of the north polar Aurora Oval. The KuaFu mission is designed to observe the complete chain of disturbances from the solar atmosphere to geospace, including solar flares, CMEs, interplanetary clouds, shock waves, and their geo-effects, such as magnetospheric sub-storms and magnetic storms, and auroral activities. The mission may start at the next solar maximum (launch in about 2012), and with an initial mission lifetime of two to three years. KuaFu data will be used for the scientific study of space weather phenomena, and will be used for space weather monitoring and forecast purposes. The overall mission design, instrument complement, and incorporation of recent technologies will target new fundamental science, advance our understanding of the physical processes underlying space weather, and raise the standard of end-to-end monitoring of the Sun-Earth system.     

气体渗碳过程的动态控制

利用气体渗碳物质传递数学模型来仿真计算碳浓度分布，并根据计算结果在计算机上拟合出碳浓度与时间、温度、气氛碳势之间的关系式，此关系式对气体渗碳的动态控制具有指导意义。