偏置式冗余空间机械臂逆运动学求解的参数化方法

针对肩、肘、腕均有偏置的空间站遥操作机械臂（SSRMS）型7DOF冗余机械臂,提出了逆运动学求解的关节角参数化及臂型角参数化两种方法。前者根据机械臂的臂型特征,推导以θ1、θ2、θ6、θ7中的一个作为给定参数时其他关节角的表达式,得出8种可能解;后者首先构造与SSRMS型机械臂相对应的零偏置球关节-旋转关节-球关节（SRS）机械臂,然后以臂型角为参数求解SRS机械臂的逆运动学,再根据SSRMS与SRS机械臂的关系,得到SSRMS的8组逆解。仿真算例校验了所提方法的有效性。     

大型索网式可展开天线在轨高精度指向控制

以星载大型索网式可展开天线为对象,研究在轨工作过程中天线视轴高精度高稳定度指向控制方法。首先,基于Craig-Bampton法建立表征天线指向的动力学模型;然后针对天线振动对视轴指向的影响,设计PD反馈+陷波滤波器的控制算法;进一步分析影响指向精度的因素,设计带有调节滤波器的改进控制器以减小天线视轴指向的周期性误差,提高指向精度与稳定度。最后,给出数值仿真校验的结果并与现有的方法进行比较。结果表明,所提出的控制算法在保证天线指向稳定的同时,可以有效减小天线视轴的指向偏差,并对干扰与振动具有良好的鲁棒性。     

抗光轴扰动的双目视觉测量方法

针对交会对接过程中双目测量相机受空间环境影响其光轴指向发生扰动的问题,提出一种抗光轴扰动的双目视觉测量方法。通过辅助光路将固定于卫星本体的参考标志分别成像于两侧像面的边缘,根据其图像变化估计光轴扰动变换矩阵,补偿因光轴扰动而产生的像面变化,从而实现抗扰动测量。理论推导表明：只要参考标志位于两侧相机视场内,便能够校正相机光轴扰动。利用地面试验平台进行了光轴扰动校正的仿真试验,试验结果表明：当两侧相机光轴存在扰动时,该方法能够有效校正光轴扰动,极大地提高了三维位置的测量精度。     

Experimental,analytical and numerical investigation on tensile behavior of twisted fiber yarns

Stitched composite materials are emerging as a promising material due to their high interlaminar strength, combined performance and light weight. The mechanical properties of stitch yarns are very essential for stitched composite structures. In this study, the tensile behaviors of the twisted fiber yarn in stitched composites were investigated experimentally, analytically and numerically. Two kinds of cross-sectional area of twisted yarn are proposed and discussed. The paper presents an intersecting circle model to describe the cross-section of twisted fiber yarns, and a physics-based theoretical model to predict the effective tensile moduli. The numerical models take into account the cross-sectional characteristic and the twist architecture. The investigation shows that: the sum of each fiber area should be used for experimental analysis; and the cross-sectional area surrounded by the yarn profile should be used for theoretical predictions and finite element (FE) simulations. The relative errors of the prediction method and the FE simulation are less than 2% and 1%, respectively. The friction between the fibers is derived, and the effect of friction on mechanical properties is discussed. The investigation method will serve as a fundamental component of twisted fiber bundle/yarn analysis.     

卫星综合软件的体系结构研究

分析国内外卫星综合软件的现状和发展趋势,阐述设计软件体系结构的重要性．提出一种卫星综合软件的分层模块化体系结构,对此体系结构进行详细地分析和说明,并对其在软件复用、软件开发和测试方面的应用以及优点进行分析,表明分层模块化软件体系结构是提高卫星软件开发效率的有效途径．     

The dynamic heliosphere,solar activity,and cosmic rays

This brief review addresses the relation between solar activity, cosmic ray variations and the dynamics of the heliosphere. The global features of the heliosphere influence what happens inside its boundaries on a variety of time-scales. Galactic and anomalous cosmic rays are the messengers that convey vital information on global heliospheric changes in the manner that they respond to these changes. By observing cosmic rays over a large range of energies at Earth, and with various space detectors, a better understanding is gained about space weather and climate. The causes of the cosmic ray variability are reviewed, with emphasis on the 11-year and 22-year cycles, step modulation, charge-sign dependent modulation and particle drifts. Advances in this field are selectively discussed in the context of what still are some of the important uncertainties and outstanding issues.     

AIT环境对卫星热控白漆性能影响的试验

热控白漆喷涂之后至卫星发射之前需要经过数个月的部件组装和测试（AIT）阶段,AIT环境是否影响热控白漆的性能是一个疑问。将与卫星天线相同热控ACR-1白漆的试验膜放置在AIT环境中,对其吸收率和发射率进行了六次测量。通过测量数据,对比分析了AIT过程中温度、湿度、洁净度等环境因素对热控白漆性能的影响程度。结果表明,在试验周期内,ACR-1白漆的吸收率和发射率变化量不大,对白漆性能可靠性的影响度不明显;洁净度对ACR-1白漆的吸收率影响较大。因此,在AIT阶段卫星环境应保持较高的洁净度。     

空间薄膜阵面结构褶皱分析

薄膜褶皱是空间薄膜阵面形面误差主要因素,其制约阵面技术性能参数。首先,基于ABAQUS软件,建立薄膜褶皱数值仿真过程和方法;对正方形薄膜阵面进行了褶皱数值模拟分析,包括分析模型和参数分析,考虑了预应力值、膜边形式（膜边、索边、卡框边）、粘结缝及粘结缝模拟方法、剪应力值对阵面褶皱的影响,取得了阵面褶皱参数特征和规律。论文方法和结论对薄膜阵面结构设计研发具有参考价值。
     

基于均匀设计的空间目标监视卫星覆盖能力仿真分析

将均匀设计方法应用到空间目标监视卫星覆盖能力仿真分析中是一种有益的尝试。在本文中,提出了利用均匀设计方法安排试验、STK仿真软件模拟试验的研究思路,能够更简单、更省时地分析空间目标监视卫星覆盖能力指标与各影响因素之间的关系。通过回归分析与规划求解得到最好的覆盖能力指标及各因素配置方案,对空间目标监视卫星覆盖能力的提高、轨道部署的优化和应用的拓展很有裨益。