机载机电系统自动测试平台的设计与实现

以提高某型飞机机载机电系统UMS的外场故障定位和隔离能力为背景,实现资源整合,对UMS系统通用自动测试平台GPATE的硬件结构与软件技术进行了研究,介绍了GPATE平台的硬件结构的组成和软件架构的设计,在GPATE平台上采用标准化、模块化设计,实现了硬件的通用性和软件的可移植性。通过实验室静态仿真和外场动态验证表明,GPATE的设计合理、各项指标均能满足实现对UMS系统功能测试的要求,有效地提高了产品的故障检测率。     

改进TOPSIS法的装备可靠性评估方法

装备的可靠性是完成遂行任务必备条件,对装备可靠性进行评估可为任务决策提供理论支持。目前关于装备可靠性评估方面的研究大多数都是基于概率统计学的,而概率统计的准确性受限于样本的大小,从而使得基于概率统计学的装备可靠性评估因装备样本的大小而产生不可避免的或大或小误差。为解决这一评估受样本大小制约的问题,引入逼近理想点（TOPSIS）法。同时,针对TOPSIS法受主观因素影响较大的问题,修定了该法评估指标权重及理想解的确定方法,并在评估结果中引入了“合格分数线”的概念,使得评估结果等级划分有了量化依据,从而体现出了客观性和科学性,然后构建了某装备基于该改进TOPSIS法的可靠性评估模型。最后,通过示例分析,利用MATLAB计算验证了本文方法的正确性,评估结果可为装备的使用者或指挥者提供决策依据。     

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。     

AgF desalination procedure for the routine determination of oxygen and hydrogen isotopic composition of saline waters and brines

The routine methods for stable oxygen and hydrogen isotope analysis of water involve water–CO₂ gas equilibration and water reduction on hot metal (e.g. Zn, Cr, U) and subsequent mass spectrometric analysis of the evolved gases of CO₂ and H₂ for ¹⁸O/¹⁶O and ²H/¹H ratios, respectively. Precise determination of the isotopic composition of water in brines with application of these standard methods is still problematic and technically often impossible due to detrimental influence of dissolved salts. The new method of brine desalination presented in this study overcomes the problem of the isotope salt effects encountered during the application of the routine techniques for the determination of the isotopic composition of high saline waters. The procedure combines two technical steps: (i) the chemical precipitation of Mg and Ca ions as insoluble non-hydroscopic fluorides, and (ii) the vacuum distillation of water from solution–precipitate mixture. The application of simple vacuum distillation allows full extraction of water and dehydration of remaining salts in a temperature range from 300 to 350?°C without hydrogen and oxygen isotope fractionation. The precision and accuracy of δ¹⁸O and δ²H determination of saline waters and brines with prior application of AgF desalination procedure is comparable with that usually obtained for fresh waters.     

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对ITER包层屏蔽块进行了热工水力学设计及分析,并给出了两套合理的加热方案.分析结果表明,可以通过分阶段改变入口气体温度的方法实现在高效加热屏蔽块的同时满足工程及部件热应力的技术要求,并通过热应力计算验证了加热过程不会对屏蔽块产生不可预期的结构破坏.     

Comparative study of three high-voltage electrode configurations for the electrostatic separation of aluminum,copper and PVC from granular WEEE

Roll-type electrostatic separators are mostly employed for the selective sorting of conductive and non-conductive constituents of granular mixtures. In case of waste electric and electronic equipment, several conductive materials may be simultaneously present in the composition of the granular mixture to be separated. The aim of this paper is to prove the feasibility of processing an Aluminum/Copper/PVC mixture using a roll-type electrostatic separator. Three high-voltage electrode configurations were studied. Experiments prove that the association of a high-voltage S-shaped plate electrode with a corona wire electrode gives the best separation results. The electric forces pin the corona-charged PVC particles to the roll electrode, while the lighter aluminum and heavier copper particles are diverted to the high-voltage electrode. The aluminum contained in the copper product can be removed by a second pass in a separator that makes use only of the S-shaped electrode. In this way, 75% of the aluminum particles and 99.97% of the PVC particles can be removed, to obtain a 98% pure copper product.     

Experimental study of a tribo-aero-electrostatic separator for finely-grinded matter

The aim of this work is to evaluate the effects of several factors that affect the selective sorting of fine particles in a two-rotating-disks-type tribo-aero-electrostatic separator. The experiments are carried out on a synthetic mixture composed of 50% Acrylonitrile Butadiene Styrene (ABS) and 50% Polystyrene (PS) particles of size 500 to 1000 μm. The six factors under study are: the high voltage, the rotation speed of the disks, the duration of the tribo-charging process, the duration of the separation, the fluidisation air flow rate, and the initial mass of the granular mixture to be processed. The performance of the separator is evaluated by setting up a measurement system that enables the continuous and simultaneous recording of the charges and the masses of the separated products. The conclusions of this study will serve at the optimum design of an industrial electrostatic separator for the recycling of micronized plastics from waste electric and electronic equipment.     

高功率激光装备小型化轻量化技术

自激光器问世以来,激光在各领域的需求和应用非常广泛,而随着高功率激光装备输出功率不断提高,重量与体积已成为制约高功率激光装备应用与发展的关键问题之一。由于当前高功率激光装备仍将提高输出功率作为其发展目标,加之高功率激光装备结构功能复杂、能量转换效率低等特点,制约了高功率激光装备小型化、轻量化的实现。本文在介绍高功率激光装备的特点及其小型化、轻量化技术约束的基础上,综述了装备常用小型化、轻量化技术应用、新型高功率激光技术应用、提高能量转换效率及散热效率等高功率激光装备小型化、轻量化实现途径,以及各种技术途径在高功率激光装备中已有的应用。根据高功率激光装备现状及特点,其在小型化、轻量化方面具有很大的发展空间及应用前景。     

Detection and jamming experiment of optical surveillance device in night equipment transportation北大核心CSCD

针对装备运输过程中可能遭遇侦拍的风险,结合运输安全需求,分析市面上常见的4类消费级侦拍装置(手机、卡片数码相机、单反相机和数码摄像机)的光电可探测性,并实现对各装置的有效干扰。通过搭建“猫眼”激光探测、激光干扰及回波信号接收系统,重点突破典型小口径侦拍装置的探测与识别,以及“猫眼”探测端与目标端的双向成像等理论和关键技术。在此基础上分析不同距离、干扰波长和孔径情况下可见光波段激光对“猫眼”目标的探测及成像干扰效果,并提出一种图像干扰效果评价标准及不同光学侦拍装置的有效干扰阈值。实验结果表明:典型光学侦拍装置在实验距离内具有良好的光电可探测性,并且可被有效干扰;在激光束完全覆盖镜头通光孔径时,目标与装置距离越近,激光束散角越小,波段越接近人眼敏感程度最大波段(555 nm),激光光束产生的非伤害性成像干扰效果越好。     

军事计量工作的重要性及其发展方向

通过介绍军事计量学的概念、作用和特点并结合美国军事最新导弹防御系统、近代局部战争中显现的信息化先进武器装备等实例,简要分析了军事计量工作的发展动态、方向和前景.