利用激光进行陀螺动平衡

利用控制的高能激光脉冲去除不平衡量的优点是:在极高转速的陀螺上,原则上能做到质量平衡。与此相反——如前所述——用普通的机械去重法(例如钻孔法)只能在静止的转子上进行不平衡量的去除。然而,从原则上来看,在陀螺工作时进行动平衡既节省时间又较精确。激光动平衡法还有的优     

基于传感器协同技术的雷达搜索空域研究

多传感器协同是当代先进战斗机的重要技术特征.利用数据链、电子战系统、红外搜索跟踪系统提供的目标信息引导雷达对指定空域进行小范围搜索,可以增加雷达波束目标驻留时间,提高雷达探测距离.本文给出了在外部目标信息引导下雷达搜索空域确定方法,对各种传感器的引导精度进行了分析,确定了雷达相应的搜索空域.     

Ground-based simulations of cosmic ray heavy ion interactions in spacecraft and planetary habitat shielding materials

This paper surveys some recent accelerator-based measurements of the nuclear fragmentation of high energy nuclei in shielding and tissue-equivalent materials. These data are needed to make accurate predictions of the radiation field produced at depth in spacecraft and planetary habitat shielding materials and in the human body by heavy charged particles in the galactic cosmic radiation. Projectile-target combinations include 1 GeV/nucleon 56Fe incident on aluminum and graphite and 600 MeV/nucleon 56Fe and 290 MeV/nucleon 12C on polyethylene. We present examples of the dependence of fragmentation on material type and thickness, of a comparison between data and a fragmentation model, and of multiple fragments produced along the beam axis.     

Dynamic change of ERPs related to selective attention to signals from left and right visual field during head-down tilt

To study further the effect of head-down tilt (HDT) on slow positive potential in the event-related potentials (ERPs), the temporal and spatial features of visual ERPs changes during 2 hour HDT (-10 degrees) were compared with that during HUT (+20 degrees) in 15 normal subjects. The stimuli were consisted of two color LED flashes appeared randomly in left or right visual field (LVF or RVF) with same probability. The subjects were asked to make switch response to target signals (T) differentially: switching to left for T in LVF and to right for T in RVF, ignoring non-target signals(N). Five sets of tests were made during HUT and HDT. ERPs were obtained from 9 locations on scalp. The mean value of the ERPs in the period from 0.32-0.55 s was taken as the amplitude of slow positive potential(P400). The main results were as follows. 1) The mean amplitude of P400 decreased during HDT which was more significant at the 2nd, 3rd and 5th set of tests; 2) spatially, the reduction of mean P400 amplitude during HDT was more significant for signals from RVF and was more significant at posterior and central brain regions than that on frontal locations. As that the positive potential probably reflects the active inhibition activity in the brain during attention process, these data provide further evidence showing that the higher brain function was affected by the simulated weightlessness and that this effect was not only transient but also with interesting spatial characteristics.     

二级轻气炮弹丸速度,质量和位置测量

二级轻气炮发射的氘冰弹丸的速度、质量和显示弹丸完整性的方法和所使用的仪器以及新开发的以波长编码、用光张赤传感器的弹丸进行位置的测量方法。     

更宽 更高 更加全方位空军军事思想变革和武器装备发展走向

航空技术和相关技术的快速发展，使航空武器装备的作战效 能和空中力量的作战效能有了质的飞跃。这不仅使空中力量在现代战争中的作用和地位日趋重要，也为空军军事思想的变革和发展提供了物质基础。     

F-22机载火控雷达系统研究

通过有源相控阵技术、低噪声接收部件、紧凑布局和高级模态开发 ,F - 2 2雷达系统实现了在性能、可靠性和低可探测性方面的大幅提升。本文基于载机综合航电系统概念 ,在分析APG - 77雷达系统硬软件体系结构的基础上 ,探讨了F - 2 2雷达在生存性、杀伤性、可靠性和保障性等方面的独特优势 ,讨论了有源相控阵技术在低雷达散射截面战斗机上应用的折衷考虑。     

加力燃烧室隔热屏屈曲变形和热结构稳定性试验研究

本文介绍了燃气涡轮发动机加力燃烧室隔热屏在高温下出现的屈曲变形。阐明了屈曲变形的基本原理和影响因素,并且通过排除加力隔热屏变形和裂纹故障的试验研究,给出了排除高温屈曲变形的有效方法和措施。     

高空长续航力传感器平台的大面积气动控制

文章对大面积气动控制方案在高空长续航力（HALE）传感器平台上的应用进行了研究。主要集中在联合翼飞行器上。这种飞行器具有主流高空长续航力飞行器所具有的两个典型的性能缺陷。第一个是由于这种布局产生的很大的转动阻尼导致在着陆时的最小的转动速率。它显示多点分布的控制面有助于满足转动速率要求。第二个是起飞总重对于最大升阻比的敏感性。设想的任务需求推动燃料比例达到一个很高的水平，升阻比小幅变化导致燃油需求减少进而大幅减少飞行器重量。这表明用于满足转动需求的技术也可以用于主动控制巡航中的扭转和弯度，并对飞行器的重量和续航力有适度的影响。