研究用现场数据估计系统可靠性参数置信区间

研究用元部件现场信息估计系统可靠性参数,如系统可靠度、可靠寿命等区间估计问题。文中提出了一种新的估计方法——替换百分点法,并运用Monte Carlo数字仿真对估计的置信度和精度进行了分析,研究结果表明此方法具有工程应用价值。     

多传感器信息融合技术

多传感器信息融合是Ｃ＾３Ｉ系统和电子综合战系统中的关键技术，本文从信息融合分类出发，讨论了单传感器的信息融合决策理论和技术以及多传感器信息融合原理，提出了多传感器信息融合专家系统，着重讨论贝叶斯法用于二元检测的分布式多传感器信息融合的检测方式。     

直流电机网络控制系统仿真

对直流电机网络闭环控制系统进行仿真分析,根据电机网络闭环控制系统原理建立仿真模型。对具有数据丢包的直流电机网络伺服控制系统输出响应特性进行仿真,比较系统分别采用PI控制及增益,可调PI控制方式时的输出特性。结果表明,相比常规PI控制增益可调PI控制方法在网络环境下具有更好的控制特性。该研究为网络伺服控制技术提供可靠的参考依据。     

煤矿监测监控系统数据集成模式

从煤矿监测监控系统的实际出发,分析国内外煤矿监测监控系统的发展现状和局限性,论述用高新技术改造我国传统煤矿监测监控系统的可行性和必要性,然后从监测监控系统的结构角度,分析煤矿监控系统现阶段的发展主流和未来的发展趋势,并最终提出相应的信息数据集成技术方案。     

波音737NG飞机大气数据探头自动加温功能测试的替代方法研究

根据波音AMM手册要求,在更换波音737NG飞机上的大气数据系统传感器后,需通过试车测试其自动加温功能。本文研究了波音737NG飞机大气数据系统探头自动加温的工作原理,并提出避免试车的解决方案。     

Electric potential structures of auroral acceleration region border from multi-spacecraft Cluster data

This paper studies an auroral event using data from three spacecraft of the Cluster mission, one inside and two at the poleward edge of the bottom of the Auroral Acceleration Region (AAR). The study reveals the three-dimensional profile of the region’s poleward boundary, showing spatial segmentation of the electric potential structures and their decay in time. It also depicts localized magnetic field variations and field-aligned currents that appear to have remained stable for at least 80?s. Such observations became possible due to the fortuitous motion of the three spacecraft nearly parallel to each other and tangential to the AAR edge, so that the differences and variations can be seen when the spacecraft enter and exit the segmentations, hence revealing their position with respect to the AAR.     

Spectroscopy peculiarities of thermal plasma of electric arc discharge between electrodes with Zn admixtures

Plasma of the free burning electric arc between Ag–SnO₂–ZnO composite electrodes as well as brass electrodes were investigated. The plasma temperature distributions were obtained by Boltzmann plot method involving Cu I, Ag I or Zn I spectral line emissions. The electron density distributions were obtained from the width and from absolute intensity of spectral lines. The laser absorption spectroscopy was used for measurement of copper atom concentration in plasma. Plasma equilibrium composition was calculated using two independent groups of experimental values (temperature and copper atom concentration, temperature and electron density). It was found that plasma of the free burning electric arc between brass electrodes is in local thermodynamical equilibrium. The experimental verification of the spectroscopic data of Zn I spectral lines was carried out.     

基于PCI-6232和LabVIEW的发动机防喘振性能试验数据采集系统设计

介绍了一种基于图形化虚拟仪器编程软件LabVIEW 的防喘性能试验数据采集系统设计方案,并且详细论述了性能测试的实现方法。本系统以美国NI公司的数据采集卡PCI-6232为硬件平台,采用连续采集方式进行数据采集,并将数据存储到文本文件中。试验结果表明,该系统能够有效地完成对信号数据的采集和及时图形显示,并能够准确的产生脉冲输出信号。     

基于一致性融合和神经网络的航空发动机气路系统故障诊断方法

以信息融合为基础,运用GRNN神经网络对航空发动机气路系统进行故障诊断,提出了一种基于一致性融合和神经网络相结合的故障诊断方法。试验结果表明,该方法能快速识别航空发动机气路系统故障,并且对其他机械设备的故障诊断具有一定的参考价值。