Design and performance test of spacecraft test and operation software

Main test processor (MTP) software is the key element of Electrical Ground Support Equipment (EGSE) for spacecraft test and operation used in the Chinese Academy of Space Technology (CAST) for years without innovation. With the increasing demand for a more efficient and agile MTP software, the new MTP software was developed. It adopts layered and plug-in based software architecture, whose core runtime server provides message queue management, share memory management and process management services and forms the framework for a configurable and open architecture system. To investigate the MTP software's performance, the test case of network response time, test sequence management capability and data-processing capability was introduced in detail. Test results show that the MTP software is common and has higher performance than the legacy one.     

可变直径轮月球探测车运动学建模与分析

针对月球探测的特殊要求,设计了具有滚动扭转转向特性的四轮直径可变月球探测车.通过对可变直径轮的原理进行分析,推导出车轮等效半径的公式.根据该月球探测车的结构特点,以闭链坐标变换和瞬时重合坐标法为基本工具,推导了四轮可变直径轮月球车基于三维地形环境的正、逆运动学模型,分析了相关的运动学特征,提出了运动学逆解的理论解法和实用解法.实用解法有效地降低了计算量.并提出了用车轮等效半径调整探测车辆俯仰角度的方法,提高了月球车的稳定性和通过性能.该研究结果为四轮月球探测车的结构分析与运动控制提供了有力的基础.      

大型挠性充液卫星自适应PID智能控制技术研究

介绍以新一代静止轨道三轴稳定卫星平台为研究对象的大型挠性充液卫星的自适应PID智能控制方案。自适应PID智能控制继承了PID控制器的优点,在PID控制器的基础上增添了模态参数智能自主在轨辨识、自适应滤波器参数自主确定,从而使自适应PID智能控制的鲁棒性、可靠性、安全性显著增强,即使帆板挠性或液体晃动等模态参数超出预定指标范围,也可以自主地智能地消除可能出现的姿态振荡。     

非会计专业《会计学基础》精品课程建设探讨

对《会计学基础》在省级精品课建设过程中的经验进行全面分析,并在此基础上提出了建设国家级精品课还需进一步完善的具体措施。     

Switching and performance variations of on-orbit BDS satellite clocks

The information of the satellite clock switching and performance variations on-orbit of Chinese BeiDou-2 Navigation System (BDS) is not available for the public. In order to detect the BDS satellite clock switching and performances variation, we analyzed the precise clock offset products with a total duration of 5?years every BDS satellite equipped four atomic clocks from four different manufactures from January 2013 to October 2017. Three important contributions are concluded as follows. (1) It is found that the average time of on-orbit operation for BDS satellite clocks is about 1–2?years. There have been 22 times of clock switching for BDS satellites, of which the C05 and C08 satellites have been switched to the fourth (last) atomic clock. (2) There are frequent phase adjustments for BDS on-orbit satellite clocks, and the frequency series is relatively stable. Furthermore, there are semi-annual sinusoid cycles in the frequency drift series of C06 and C09 satellites. (3) The performances of MEO satellite clocks perform better than the IGSO and GEO satellite clocks. The average ten-thousand frequency stability of BDS satellite clocks is about 1E-13, which is worse than that of GPS and Galileo but better than that of GLONASS.     

基于最小二乘支持向量机的工具误差分离与折合

制导工具误差分离与折合是导弹精度评定中的重要问题,提出了利用支持向量机方法获得工具误差系数估计和进行弹道误差折合的新方法,由于支持向量机综合考虑了结构风险和经验风险,使得模型的泛化能力增强。仿真计算表明,与最小二乘和主成分方法相比,最小二乘支持向量机获得的误差系数估计与真值更加接近,折合得到的全程弹道遥外差更加准确。     

板料n,r值对钣金零件成型工艺的影响

本文详细论述了板料成型性能指数ｎ，ｒ值的物理意义及其对各种钣金元件成型工艺性的影响，结合典型成型工艺，利用钣金冷压成型原理，对ｎ，ｒ值的具体影响进行了分析研究腹出了一些针对具体成型工艺的一般规律性的结论。将本文的一些概念和分析研究的结果同具体的生产实践相结合，则会对促进生产和提高成型件的质量有一定的指导意义。     

纤维缠绕复合材料弯管强度分析

基于ANSYS有限元分析软件，利用其中的层合板单元，对纤维缠绕复合材料弯管的强度进行分析，并进一步预测了弯管的破坏压力。通过与试验结果的对比，验证了分析模型和分析方法的有效性，为分析纤维缠绕弯管结构的强度提供了一种有效的途径。     

伸展垂直薄片非定常层流自然对流的群论分析

用Ｍｏｒｇａｎ的双参数变换群理论，对磁场作用下的伸展垂直薄片的不可压缩非定常层流自然对流边界层流动进行相似性分析，得到了三种情况下的相似性解方程组。并在不同的Ｐｒ，Ｎｍ，Ｆｃ和ｒ下，用四阶龙格－库塔法进行了数值求解，得到了速度和温度分布，并给出了一组相似性解的结果。     

深空探测车辆与我国月面巡视探测器研制进展

月面巡视探测器是一个技术高度集成的行走机构,涉及车辆工程、车辆-地面力学、多体动力学、信息处理及自动控制方法等若干现代科学基础理论及工程技术领域.此外,还包括热控、材料.电控、传感器、星际通讯等工程技术.