机载光电稳定平台常用材料的应用

介绍了2种机载光电稳定平台本体常用制造材料,利用有限元的方法对平台本体的强度和变形情况进行了分析.给出了不同材料在平台本体制造中的应用场合.     

Real-time fault detection method based on belief rule base for aircraft navigation system

Real-time and accurate fault detection is essential to enhance the aircraft navigation system’s reliability and safety. The existent detection methods based on analytical model draws back at simultaneously detecting gradual and sudden faults. On account of this reason, we propose an online detection solution based on non-analytical model. In this article, the navigation system fault detection model is established based on belief rule base (BRB), where the system measuring residual and its changing rate are used as the inputs of BRB model and the fault detection function as the output. To overcome the drawbacks of current parameter optimization algorithms for BRB and achieve online update, a parameter recursive estimation algorithm is presented for online BRB detection model based on expectation maximization (EM) algorithm. Furthermore, the proposed method is verified by navigation experiment. Experimental results show that the proposed method is able to effectively realize online parameter evaluation in navigation system fault detection model. The output of the detection model can track the fault state very well, and the faults can be diagnosed in real time and accurately. In addition, the detection ability, especially in the probability of false detection, is superior to offline optimization method, and thus the system reliability has great improvement.     

项目的目标管理

描述了项目的界定、组织、质量、费用、时间、风险6个目标,以及6个目标间的相互关系.     

调节阀特性研究

针对某种调节阀,利用AMESim软件建立了该调节阀的仿真模型,仿真计算了该调节阀液流试验的流量特性,结果与调节阀液流试验结果基本一致,证明了仿真模型的合理性。利用该模型准确地预测了全系统试验过程中调节阀的流量特性,并对该调节阀的起动特性进行了初步研究。     

注装梯恩梯(TNT)装药冲击Hugoniot参数的实验测定

本文利用一级轻气炮实验技术，对注装梯恩梯药进行了高应变率下的动态冲击实验，对实验方法进行了改进，设计了一种新型的轻气炮延伸炮管。根据实验数据结果，得到了注装ＴＮＴ装药的冲击Ｈｕｇｏｎｉｏｔ参数。     

Observations of Photospheric Dynamics and Magnetic Fields: From Large-Scale to Small-Scale Flows

This paper reviews solar flows and magnetic fields observed at the photospheric level. We first present the context in which these observations are performed. We describe the various temporal and spatial scales involved, and the coupling between them. Then we present small-scale flows, mainly supergranulation and flows around active regions. Flows at the global scale are then reviewed, again with emphasis on the flows, i.e. differential rotation, torsional oscillation and meridional circulation. In both small- and global-scale we discuss the coupling between flow fields and magnetic field and give an overview of observational techniques. Finally, the possible connection between studies of solar activity and stellar activity is briefly discussed.     

回流焊温度曲线热容研究

本文全面的分析了回流焊温度曲线在回流焊工艺中的作用，回流焊工艺的工艺特点、影响回流焊温度曲线的各种因素。如何从热容的思想建立回流焊温度曲线的方法？如何调整温度曲线通过控制温度曲线改善工艺过程，减少回流焊工艺的缺陷？     

一种用于出舱活动的相变储热／辐射器式热沉

首先讨论了出舱活动中的各种散热方案；然后介绍了一种相变储热／辐射器式热沉。给出了闭式散热系统设计的性能要求及相变材料的选取标准和计算方法。     

利用声共振测量管件长度的研究

介绍一种利用声共振原理测量大长度管件长度的方法，通过测量管内空气的共振频率来确定管长。对这种方法的原理、数学模型进行了较为深入的分析，提出了具体的测量方案，并对系统进行了误差分析。结果表明，该方法的测量误差为±０．０５％，并可实现便携式仪器和单端测量。     

Special Technologies Related to Electron Beam Welding

In order to improve the manufacturing quality of electron beam welding,some technologies are developed by using the special features of electron beam.Comparing with the conventional electron beam welding,the usage of multi-beam technology and micro-beam technology are introduced.In addition.the development of beam diagnostic system is also presented.