EE system电子工程系统操作指南

EE system是微机上使用的电子工程系统.本文介绍该软件的主要功能和印制板布线(PCB)的操作方法.     

航空火力控制系统试验概述

航空火力控制系统试验是十分重要的，它贯穿于整个武器火控系统的研制周期，是武器火控系统研制的重要内容，本文对航空火控系统及模拟目标进行了分类，叙述了试验系统的特点，基本组成以及主要内容，最后指出了系统试验应着重注意的若干问题，该文是对火控系统试验工作的总结。     

Parametric solution to the joint system identification and optimization problem

This study is concerned with the simultaneous identification and optimization of static systems. The necessity and the advantages of an integrated approach to the identification and optimization of the system model is established theoretically as well as computationally. A parametric approach to the integrated problem is proven to converge to the integrated problem solution. The general methodology of decomposition of large-scale systems is extended by implementingfeasible decomposition of the joint problem. A multilevel approach is then utilized to successfully solve example problems. Handling the system constraints via a penalty-function technique is shown to be an efficient approach when using the parametric formulation of the joint problem. Numerical results for two example problems are presented using the Univac 1108 digital computer, revealing the economic advantages and disadvantages of the integrated approach to the identification and optimization problems.The authors wish to thank Messieurs I. Lefkowitz, L. S. Lasdon, F. Gembicki, and O. B. Olagundoye for their critique, comments, and suggestions during the course of this study.     

模拟电路的故障回路和故障网孔的诊断

文中给出了模拟电路多故障诊断的回路法和网孔法,使K故障诊断理论内容完整,在某些情况下,回路诊断法具有一定的优越性。     

锁相调频中的噪声性能分析

本文分析了有噪调频锁相环的噪声种类,得出了有噪调频锁相环的相位模型,计算出了环路输出噪声相位方差。     

On the Existence and Construction of Tight Fourth Order Quadrature Rules for the Sphere

We study the so-called tight quadrature rules for polynomials of degree 4 on the unit sphere S ^D-1 and present precise formulae for the first 6 components of the nodes in terms of the parameter u := . In particular, we reobtain the well-known necessary condition for the existence of such rules saying that u has to be an odd integer and we sharpen it under an additional assumption.As a constructive application, two explicit tight fourth order quadrature rules for the case D = 7 are given.     

非均匀性对自由面粒子速度信号的影响

在平板撞击实验中,通常利用应力计或VISAR来获得样品中应力历史或自由面粒子速度信号来研究材料的动态力学性能.本文采用含预制缺陷的K9玻璃作为研究对象,利用口径为37mm火炮加载装置,在靶样品的自由面上2 mm线长度范围内,利用16路激光多普勒探针测量系统(DPS),对样品自由面不同位置的自由粒子速度同时进行测量,此方法不同于传统的单点VISAR测量样品自由面速度,其空间分辨率为127μm,可分辨材料内部非均匀性(尺寸大于127μm的夹杂、缺陷等)对自由面速度信号的影响.本文的实验方法可为从细观尺度研究材料动态力学性能提供一种研究思路.     

Crack detection in existing structures using noise-contaminated dynamic responses

Crack detection is existing structures using measured dynamic response information is presented in this paper. The general area of health assessment of existing structures in the presence of uncertainty in modeling the structure, characteristics of sensors, and the dynamic response information collected by the sensors is emphasized. A time domain system identification-based procedure is proposed to assess health of a structure at the finite element level in the presence of all major sources of uncertainty. It is denoted as the GILS-EKF-UI method. The method does not require information on excitation that caused the response and the noise-contaminated response information needs not be available at all dynamic degrees of freedom. The method is verified using computer generated analytical and actual measured response information emphasizing three items: (1) identification of the defect-free frame, (2) detection of location of a crack accurately within a defective element, and (3) detection of a crack using limited response information using the GILS-EKF-UI method.     

集邮网络管理系统使用绿卡线路的可行性分析

为了证实集邮网络管理系统与绿卡系统共用绿卡线路的可行性,对业务量和系统响应时间等进行了测试和计算,得出了可以共用的结论。     

WAP技术及WAP业务

介绍了WAP的背景、整体架构、体系协议的各层组成、移动数据业务及最新发展,并举例说明;对我国WAP业务发展及WAP网站建设提出了建议。