一种高可靠航天器火工品等效器的设计与实现

目前航天器电传爆火工品采用脉宽信号起爆,一般多个点同时起爆,路数较多且脉宽窄;针对航天器地面模飞测试时,精确监测各个火工品起爆次数和起爆指令脉宽问题,提出了一种火工品等效器的设计方案,它由PXI工控机、通用板卡和专用板卡,以及备份数据浏览终端等4部分组成,具有可靠性高、通用性强、维修性好等特点,已在YZ-3上面级中得到应用,对整器自动化测试和发射起到了有力的支持作用。

火工品计算机检测数据库管理系统

叙述航天器火工品计算机检测数据库管理系统的主要功能及模块结构、系统数据结构设计、以及其与检测系统数据交换的软件接口．介绍数据库自动管理、数据维护、查询、以及数据库备份的方法．

电火工品电磁危害评估

分析了射频能量对电火工品的危害机制,给出了电火工品电磁危害评估的方法。用线性内插法绘出射频功率——频率曲线。

Live Memory Acquisition through FireWire

Although FireWire-based memory acquisition method has been introduced for several years, the methodologies are not discussed in detail and still lack of practical tools. Besides, the existing method is not working stably when dealing with different versions of Windows. In this paper, we try to compare different memory acquisition methods and discuss their virtues and disadvantages. Then, the methodologies of FireWire-based memory acquisition are discussed. Finally, we give a practical implementation of FireWire-based acquisition tool that can work well with different versions of Windows without causing BSoD problems.

Independent component analysis approach for fault diagnosis of condenser system in thermal power plant

A statistical signal processing technique was proposed and verified as independent component analysis(ICA) for fault detection and diagnosis of industrial systems without exact and detailed model.Actually,the aim is to utilize system as a black box.The system studied is condenser system of one of MAPNA's power plants.At first,principal component analysis(PCA) approach was applied to reduce the dimensionality of the real acquired data set and to identify the essential and useful ones.Then,the fault sources were diagnosed by ICA technique.The results show that ICA approach is valid and effective for faults detection and diagnosis even in noisy states,and it can distinguish main factors of abnormality among many diverse parts of a power plant's condenser system.This selectivity problem is left unsolved in many plants,because the main factors often become unnoticed by fault expansion through other parts of the plants.

Self-adaptive fuzzy controller with formulary rule for servo control of discharge gap in Micro EDM

In micro electrical discharge machining （micro EDM）, it is difficult for servo controlling the narrow discharge gap with the characters of non-linear and quick change. In this paper, aiming at solving the problems above, a self-adaptive fuzzy controller with formulary rule （SAFCFR） is presented based on the dual feedbacks composed by gap electric signal and discharge-ratio statistics. To ensure the properties of self-optimizing and fast stabilization, the formulary rule was designed with a tuning factor. In addition, the fast-convergence algorithms were introduced to adjust control target center and output scale factor. In this way, the normal discharge ratio can tend to the highest value during micro-EDM process. Experimental results show that the proposed algorithms are effective in improving the servo-control performance. According to the drilling-micro-EDM experiments, the machining efficiency is improved by 20% through applying SAFCFR. Moreover, SAFCFR is a prompt way to optimize parameters of discharge-gap servo control.

Refueling Test System Completed In-orbit Verification

The in-orbit verification of a refueling test system has been completed successfully.The test system based on a surface tension tank was developed by the Beijing Institute of Control Engineering（BICE）,CAST and launched into spacewith the Tianyuan 1 satellite aboard a LM-7 carrier rocket on June 25.The lifetime of any spacecraft is constrained by fuel it carried.

CL-20基炸药油墨的直写成型及性能研究

以六硝基六氮杂异伍兹烷(CL-20)作为主体炸药,乙基纤维素(EC)及聚叠氮类粘结剂为粘结剂,乙酸乙酯为溶剂,配制出一种全溶性炸药油墨。采用微控直写工艺将该炸药油墨在基板上进行了书写,并对成型后所得复合物的性能进行了测试和表征。结果表明:成型样品中CL-20颗粒形貌为球形,颗粒尺寸小于1μm,均匀分布在粘结体系基体中;成型样品的密度为1.66 g/cm^3,达到理论密度的85.5%;和原料CL-20相比,复合物的撞击感度得到明显降低,特性落高比原料CL-20高出21.5cm。该配方具有良好的传爆性能,1.2mm装药宽度下,爆轰临界尺寸为0.357mm。