一款新研制ASIC器件的单粒子效应检测与故障定位

针对一款国产新研ASIC器件抗单粒子能力评估的需要,研制了ASIC器件单粒子效应检测系统。通过单粒子效应评估试验,得到了该器件在Kr离子辐照下的单粒子翻转数据。采用故障树分析和电路仿真技术,对ASIC器件内部单粒子翻转敏感模块进行定位。研究成果可为器件厂家后续设计改进和卫星型号系统级抗辐射加固设计提供依据。     

叶片型面精密振动电解加工工艺研究

采用电解加工工艺对叶片型面进行加工,可以有效提高发动机叶片加工效率,降低生产成本。针对GH4169G合金叶片型面,开展了精密振动电解加工试验研究。结果表明:高频脉冲电流和阴极机械振动具有改善极间流场特性、降低阳极钝化和阴极的产物吸附的作用,可以大幅改善加工效果;采用参数组加工电压15V、阴极振动频率25Hz、开通角度Ra 150°~195°、脉冲频率3000Hz时,获得最优的型面加工质量,型面轮廓度为-0.012~+0.013mm,表面粗糙度值为0.51μm,证明精密振动电解加工工艺满足叶片型面的加工要求。     

航空公司不安全事件发生率的贴近度研究

运用模糊数学中的Euclid贴近度方法,分析了中国民航2005—2009年各航空公司在各季度的亿吨公里不安全事件发生率数据,确定出航空公司各季度发生不安全事件的贴近关系为相邻季度的不安全事件发生率贴近度最大,且有第四季度不安全事件发生率与第三季度最贴近,第一季度与上一年第四季度不安全事件发生率的贴近度次之,之后依次是第二季度与第一季度、第三季度与第二季度。随着贴近度的变小,各季度与相邻前一季度不安全事件发生率的可比性变差。     

基于蒙特卡洛法的飞机装备完好率建模仿真

装备完好率是军用飞机战备完好性的重要度量标准,是可靠性维修性保障性RMS（Reliab ility,Maintainab ility and Supportab ility）顶层参数。利用Monte-Carlo抽样、离散事件仿真、计算机仿真等理论建立了基于设备参数和使用规则的仿真模型和算法,并以案例验证了方法的可行性。仿真模型具有通用性,满足不同参数的仿真需求。     

直升机驾驶人员的可靠性分析与研究

根据直升机的使用及型号研制中的经验教训,提出了在直升机的可靠性分析中必须考虑人的失误对直升机使用的安全性和可靠性的影响,并根据THERP(Technique for the Human Error Rate Prediction)方法,建立了人的失误的分析和计算程序,最后以直11型机为例详细地说明了THERP方法的应用。     

Interplanetary proton cumulated fluence model update

Solar particle events leading to important increase of particle fluxes at energies of order of magnitude ranging from MeV to GeV constitute an important hazard for space missions. They may lead to effects seen in microelectronics or damage to solar cells and constitute a potential hazard for manned missions. Cumulative damage is commonly expressed as a function of fluence which is defined as the integral of the flux over time. A priori deterministic estimates of the expected fluence cannot be made because over the time scale of a space mission, the fluence can be dominated by the contribution of a few rare and unpredictable high intensity events. Therefore, statistical approaches are required in order to estimate fluences likely to be encountered by a space mission in advance. This paper extends work done by Rosenqvist et al. [Rosenqvist, L., Hilgers, A., Evans, H., Daly, E., Hapgood, M., Stamper, R., Zwickl, R., Bourdarie, S., Boscher, D. Toolkit for updating interplanetary proton-cumulated fluence models. J. Spacecraft Rockets, 42(6), 1077–1090, 2005] to describe an updated predictive engineering model for the proton interplanetary fluence with energies >30 MeV. This model is derived from a complete list of solar proton fluences based on data from a number of calibrated sources covering almost three solar cycles.     

浅谈幻象主题修辞批评的分析方法

幻想主题修辞批评认为,制造修辞幻象可把游离的群体转变为一致的社团,是演说者与听众形成一种相互亲近、相互信任的有效途径。文章试图从起源、相关理论以及具体的分析方法步骤三个方面来阐述此分析方法。     

任务系统软件体系结构风格研究与应用

本文以某型航电任务系统研发为背景，介绍了几种经典体系结构风格的设计特点和应用。理论和研发实践相结合，项目的顺利推进证明了软件体系结构风格的分析对明确设计思路和指导代码开发具有重要意义，加快了软件研发的进度，保证软件质量，同时又增加了系统的可扩展性，降低研发成本。     

A study of GPS ionospheric scintillations observed at Shenzhen

Ionospheric scintillation variations are studied using GPS measurements at the low latitude station of Shenzhen (22.59°N, 113.97°E), situated under the northern crest of the equatorial anomaly region, from the Chinese Meridian Project. The results are presented for data collected during the current phase of rising solar activity (low to high solar activity) from December 2010 to April 2014. The results show that GPS scintillation events were largely a nighttime phenomenon during the whole observation period. Scintillation events mainly occurred along the inner edge of the northern crest of the equatorial anomaly in China. The occurrence of scintillations in different sectors of the sky was also investigated, and the results revealed that it is more likely for the scintillations to be observed in the west sector of the sky above Shenzhen. During the present period of study, a total number of 512 total electron content (TEC) depletions and 460 lock loss events were observed. In addition, both of these events are likely to increase during periods of high solar activity, especially because the strong scintillations are often simultaneously accompanied by TEC depletions and lock losses by GPS receivers.     

实时离散事件系统的状态反馈逻辑

 基于状态时间的概念,在Ramadge-Wonham模型的基础上提出了一种新的实时离散事件系统模型。在控制目标是保持某给定谓词在闭环系统状态轨迹上为真的情况下,给出了实时控制不变性的定义。研究表明,对这类系统,存在一个状态反馈控制器使给定谓词在闭环系统状态轨迹上保持为真的充要条件是该谓词是实时控制不变的。证明了给定谓词所含的最大实时控制不变子谓词的存在性并给出了计算方法。最后,给出一个例子来说明有关结果。