屏蔽微带线的等效网络分析

本文首次采用等效网络法分析屏蔽微带线特性.文中除了讨论屏蔽微带线的色散特性外,还讨论了截面不连续处的散射特性以及屏蔽微带线几何尺寸对色散特性的影响,得到了满意的数值结果.     

用双入射角的反射型椭偏术自动测定单层膜厚度

本文提出了应用双入射角的反射型椭偏术,可克服椭偏仪一般只能测定膜层厚度小于1周期值的缺点。该技术已成功地应用于微机控制自动消光法椭偏仪上,能自动测定厚膜的膜厚和折射率。经大规模集成电路生产中使用,效果良好,且能提高测量精度和简化操作。     

基于粒子群算法的数字电路测试生成

在已有的数字电路测试生成算法基础上，通过对一种结构简单且容易实现的算法——粒子群算法的研究，提出了一种基于模拟的测试矢量生成的新方法，即应用粒子群算法来进行数字电路的测试生成．对一些组合电路进行了仿真，并将其与基于遗传算法的测试生成方法进行比较，实验结果表明该方法比基于遗传算法的测试生成更为有效．     

连续时间广义预测控制在纵向飞行控制中仿真

导弹的飞行主要是通过姿态稳定和调节实现的。当导弹在大空域内进行飞行时,系统存在着严重的非线性和复杂性等不确定性因素,采用离散的控制算法进行控制,在高采样速率情况下,产生控制抖动问题。提出了连续时间控制方案,通过以小扰动模型为基础的导弹动力学特性分析,设计了导弹纵向飞行通道的全空间串级控制结构,并且以连续模型作为预测控制的被控对象,弹道外回路和姿态内回路均采用连续时间广义预测控制算法。仿真结果表明,该控制方案能实现高精度的控制要求,并且有效的克服了控制抖动。     

Numerical investigation on the self-excited oscillation of wet steam flow in a supersonic turbine cascade

The self-excited flow oscillation due to supercritical heat addition during the condensation process in wet steam turbine is an important issue. With an Eulerian/Eulerian model, the self-excited oscillation of wet steam flow in a supersonic turbine cascade is investigated. A proper inlet supercooling results in the transition from steady flow to self-excited oscillating flow in the cascade of steam turbine. The frequency dependency on the inlet supercooling is not monotonic. The flow oscillation leads to non-synchronous periodical variation of the inlet and outlet mass flow rate. The aerodynamic force on the blade varies periodically due to the self-excited flow oscillation. With the frequency lies between 18.1?80.64 Hz, the oscillating flow is apt to act with the periodical variation of the inlet supercooling due to stator rotor interaction in a syntonic pattern, and results in larger aerodynamic force on the blade. The loss in the oscillating flow increases 20.64% compared with that in the steady flow.     

A New Method for the Detections of Multiple Faults Using Binary Decision Diagrams

With the complexity of integrated circuits is continually increasing, a local defect in circuits may cause multiple faults. The behavior of a digital circuit with a multiple fault may significantly differ from that of a single fault. A new method for the detection of multiple faults in digital circuits is presented in this paper, the method is based on binary decision diagram （BDD）. First of all, the BDDs for the normal circuit and faulty circuit are built respectively. Secondly, a test BDD is obtained by the XOR operation of the BDDs corresponds to normal circuit and faulty circuit. In the test BDD, each input assignment that leads to the leaf node labeled 1 is a test vector of multiple faults. Therefore, the test set of multiple faults is generated by searching for the type of input assignments in the test BDD. Experimental results on some digital circuits show the feasibility of the approach presented in this paper.     

磁轴承中磁路设计问题的研究

电度表用磁力轴承越来越受人们的青睐.该文采用有限元法编写的ANSYS软件对磁轴承的核心零件尺寸进行了计算,通过计算得出磁环的最佳尺寸参数,实验表明,计算结果与实测结果的偏差很小.根据计算结果,设计并制造了一种全新的磁悬轴承,结果令人满意.     

k故障诊断的反投影法

本文利用奇异值分解和子空间夹角提出了反投影法．它定位模拟电路ｋ故障的速度是以 往其他方法的几倍到几十倍，     

含沙水流中水轮机导叶的设计研究

依奇点分布法和前人分析实验得到的含沙水流中固体颗粒的受力分析结果,利用相对阻塞和相对抽吸的观点对含沙水流中水轮机导叶进行设计。经模型试验表明,与传统方法设计的导叶相比,用本文提出的方法设计的导叶在含沙水流中运行时,水力效率高,耐磨蚀。     

广义de Bruijn图中Euler回路和Hamilton圈的计数

讨论了广义de Bruijn图G_B(n.d)的线图的Euler回路的个数,从而给出G_B(n.d)的Hamilton圈的计数定理。