Technology of Modeling for Shape Memory Alloy Reinforced Composites

在对形状记忆合金增强复合材料层合板进行应力、应变和温度关系实验的基础上 ,建立了形状记忆合金增强复合材料四边形和三角形板单元模型 ,并推导了相应的有限元公式 .在此基础上编制了能够进行静态和动态分析的有限元程序 ,并利用该程序对形状记忆合金增强复合材料悬臂梁进行了分析 ,结果是令人满意的 .随着对形状记忆合金研究的进一步发展 ,这种材料必将在智能材料和结构设计中发挥越来越重要的作用 .     

人工智能航天领域应用参考模型

针对人工智能在航天领域的发展和应用问题,梳理了人工智能涉及的技术内涵和技术范畴,分析了在航天领域应用人工智能的近期迫切需求,给出了人类自然智能功能结构,构建了"信息感知、记忆思维、学习适应、行动驱动"的人工智能模型。从基础设施、基础技术、应用技术、产品与系统等层次,给出了人工智能技术参考模型,对需要发展的核心关键技术进行了描述。该参考模型可为明确航天领域的人工智能技术发展重点、建立标准体系提供参考。     

A comparison of ionosonde measured foF2 and IRI-2016 predictions over China

A comparison of the ionospheric F-region critical frequency (foF2) between ionosonde measurements and IRI-2016 predictions is studied over China during the period from January 2008 to October 2016. Four stations are selected, and the latitude coverage starts at 49.4°N and ends at 23.2°N with a sequential latitude interval of about 10°, the corresponding geomagnetic latitudes are from 39.5°N to 13.2°N. The results show that the variability of the observed foF2 versus latitudes, seasons, local time and levels of solar activity could be well reproduced by IRI-2016. However, the daily lowest value of foF2 from the IRI-2016 prediction occurs earlier than that from the ionosonde. Around the sunrise, the IRI-2016 prediction shows a very sharp rise and grows much faster than the observed foF2 in every month. The foF2 difference between the two options (URSI and CCIR) in IRI-2016 increases as the F10.7 index decreases. During 2008–2009, the annual average deviations of URSI and CCIR range from ?5% to ?10% and from 5% to ?5%, respectively. Generally, the CCIR performs better than URSI during postsunset under low solar activity or in Equatorial Ionization Anomaly (EIA) region over China, while it shows no large difference in performance with URSI in other locations or for other time.     

嫦娥四号中继星供配电分系统可靠性设计与验证

针对嫦娥四号中继星的轨道特点、在轨工作模式和任务要求,供配电分系统采用半调节母线拓扑结构和电源调节与配电控制一体化的方案实现了集成化、轻量化设计需求。重点识别了供配电分系统可靠性设计的关键要素,从供电可靠性、能源安全性和在轨能源管理等方面进行分析和设计,并进行了充分的地面专项验证试验。通过在轨多种工况考核和遥测数据分析可知,供配电分系统工作正常,满足设计要求。     

A novel BIST scheme for circuit aging measurement of aerospace chips

The avionics working environment is bad, easy to accelerate aging of circuits. Circuit aging is one of the important factors that influence the reliability of avionics, so circuit aging testing is of great significance to improve the reliability of avionics. As continuing aging would degrade circuit performance, aging can be monitored through precise measurement of performance degradation. However, previous methods for predicting circuit performance have limited prediction accuracy. In this paper, we propose a novel Built-In Self-Test (BIST) scheme for circuit aging measurement, which constructs self-oscillation loops employing parts of critical paths and activates oscillations by specific test patterns. An aging signature counter is then used to capture the oscillation frequency and in turn measure the aging state of the circuit. We propose to implement this measurement process by BIST. Experimental results show that the proposed in-field aging measurement is robust with respect to process variations and can achieve a precision of about 90%. The application of this scheme has a certain value to improve the reliability of avionics systems.     

LED多媒体网络系统结构及采用的图像压缩技术

描述了珠海机场航班显示系统──ＬＥＤ的多媒体系统网络结构，具体说明了所使用的ＡＴ＆Ｔ结构化布线系统，讨论了系统中采用的多媒体技术。重点分析了ＪＰＥＧ静止图像数据压缩技术，较深入地阐述了基于离散余弦变换（ＤＣＴ）的有失真压缩编码．目前，珠海机场的ＬＥＤ多媒体网络系统已投入实际使用，肩负着机场航班显示、文字广告、视频广告、动画广告等信息的播放和制作。     

ZH-02综合转台机械设计

叙述了综合转台的机械设计结构及工作原理，对ZH—01综合转台存在的问题进行了对比分析，并且提出了改进的方法。     

Method for Measuring Residual Stresses Induced by Boring in Internal Surface of Tube and Its Validation with XRD Method

Residual stresses can have a strong effect on the usability of machined parts,and the X-ray diffraction(XRD)measuring equipment,which is commonly used to measure residual stresses,is very expensive.This paper presents a method of measuring the residual stresses induced by boring in the internal surface of a tube with much cheaper equipment.The method,called the strain-based method is mainly based on the strains measured on the external surface of the tube.It is proposed on the basis of the very long tube assumption.The finite element method(FEM)analysis is thus used to validate the length of the tube.Guided by the FEM results,an appropriate length of the tube is chosen,and the residual stresses are obtained from both the strain-based method and the XRD method.Stress profiles obtained from both two methods are compared.The comparison result indicates that the profiles of the two methods agree well with each other.Therefore,it can be concluded that the accuracy of the strain-based method is high enough,and it can be applied to residual stress measurement in practice.     

ARINC629航空数据总线研究

从ARINC629总线系统的发送机制、消息格式和个性化表3个方面介绍了ARINC629总线系统.     

基于强化学习的软体机构抓捕策略研究

大型空间结构建造与维护、失效卫星检测与维修、轨道碎片清除等已成为航天技术发展亟待解决的现实问题。针对传统空间捕获机构质量惯量大、末端抓取精度要求高、抓捕对象适用范围窄不足等,创新性地提出基于IPMC(ion-exchange polymer metal composite)功能复合材料的多自由度仿生软体新型抓捕机构,同时基于强化学习算法提出多模态信息融合的抓捕操作强化学习策略,从而提升抓捕机构空间捕获的成功率,为空间抓捕技术的智能化发展提供新思路。