Advanced Search

2003 Vol. 29, No. 4

  Previous Issue | Next Issue 
Display Method:
Analysis of Operation Effectiveness of ARM in Antagonizing AirDefense System
Ma Dongli, Zheng Mingqiang, Xia Haiting
2003, 29(4): 283-286.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 677
Abstract:
Operation effectiveness of aircrafts with anti-radiation missiles (ARM) in antagonizing SAM air defense system is studied. The maximum number and average number of penetrating aircrafts possibly shot by SAM missiles are given. Through an analysis of the lead speed character of ARM, methods of calcul...
Solution of Tridiagonal Banded Linear Equation Setwith Diagonal Points Based on QR Decomposition
Wang Ganglin, Wu Zhe
2003, 29(4): 287-290.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1173
Abstract:
A characteristic linear equation set is a tridiagonal banded linear equation set with two diagonal points. Generally, it is very difficult to solve the equation set perfectly with methods of linear algebra. Different from the algebra based on LU decomposition and iterative algebra, author brings for...
TT&C System Based on VR Technology for Unmanned Helicopter
Zhao Gang, Zhang Xiaolin
2003, 29(4): 291-294.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1017
Abstract:
By introducing VR technology and designing a high speed telemetry data filter algorithm, a high performance long-distance real-time unmanned helicopter TT&C system was constructed. This system possesses advantage in real-time reliability and visualizing of telemetry data.
On the Distribution of Stress in Blood Vessel Wall
Wang Shoumei, Xu Ming
2003, 29(4): 295-298.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1094
Abstract:
Mechanical stress has long been hypothesized as one of the important factors in regulating the structure and organization of vascular smooth muscle cells. Based on the conceptions of zero stress state and opening angle proposed by earlier researchers, stress distribution in blood vessel wall with in...
Method for Calculating the Dynamic Path Error of NC Machine Tools Based on MATLAB
Huan Ji, Ma Weimin
2003, 29(4): 299-302.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1955
Abstract:
The sources of dynamic path error of NC machine tools during milling process are analyzed, a simulating method based on MATLAB is introduced. The simulating modules and calculating methods of some typical 2-axises and 4-axises tracks at different feed speeds are also described. The simulating result...
Indirect Adaptive Control Based on Hierarchical Fuzzy Systems
Sun Duoqing, Huo Wei
2003, 29(4): 303-307.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 759
Abstract:
In order to solve the problem that the number of rules in a (standard) fuzzy controller increases exponentially with the number of variables involved, an indirect adaptive control scheme for a class of nonlinear systems was proposed based on hierarchical fuzzy systems. It was proved that the propose...
Optimization of Extended Kalman Filter for Cellular Mobile Location
Shi Yanshan, Li Daoben, Fan Yuezu
2003, 29(4): 308-311.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1605
Abstract:
An extended Kalman filtering (EKF) algorithm is designed for radiolocation in cellular communication system, simulation is conducted to examine its performance. An improvement of the algorithm is then made, using predicative error obtained by variance of time of arrival (TOA) measures and the linear...
Theoretical Research on Software Reliability Testing Adequacy
Li Qiuying, Lu Minyan, Ruan Lian
2003, 29(4): 312-316.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1858
Abstract:
Based on the significance of research on software reliability testing adequacy,the concept, the classification and the relationship of software reliability testing adequacy criterion with the whole software testing adequacy criteria system are presented. A method of how to use the relationship in so...
On the Vibration of Stator of Linear TravelingWave USM
Ji Yuan, Li Hua, Zhang Deyuan
2003, 29(4): 317-320.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 793
Abstract:
Semi-infinite slender beams were analyzed with the theory of elastodynamics, conditions for large amplitude of slender beams were calculated. Based on the conditions, a linear traveling-wave Ultrasonic Motor(USM) was developed. Vibration of the stator of USM was analyzed based on consideration of tr...
Direct Numerical Simulation of Coherent Structures in a Boundary Layerwith Steady Pressure Gradients
Li Zhaorui, Lu Lipeng, Zhang Qiang
2003, 29(4): 321-326.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 882
Abstract:
By using the method of direct numerical simulation(DNS), evolution of coherent structures in the wall region of a turbulent boundary layer with three different pressure gradients was studied. Initial values of the coherent structures in the wall region were obtained on the basis of the idea of reson...
Application of Diakoptics Arithmetic to RF and Microwave Circuit Design
Li Mei, Su Donglin, Yang Zhengguang
2003, 29(4): 327-330.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 767
Abstract:
It is very important to choose proper time domain modes when microwave structures are analyzed by time domain Diakoptics. Efforts were made to find out the proper time domain modes for analyzing open microwave structures. Based on analysis of electromagnetic field distributions for such open microwa...
Design of a TwelveChannel Digtal GPS Simulation System
Lu Juan, Chang Qing, Zhang Qishan, Zhang Jun
2003, 29(4): 331-334.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1331
Abstract:
For the purpose of testing the performance of GPS receivers, a GPS signal simulator is needed that can emulate the real GPS signals under all kinds of conditions. Single channel and multi-channel GPS signals' characters in time domain and frequency domain are analyed. A mathematic model of the twelv...
High Order Entropy Condition Scheme for Mixed Euler/N-S Equations
Li Jingjing, Li Chunxuan, Dong Haitao
2003, 29(4): 335-338.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 945
Abstract:
In order to circumvent the problem of a huge amount of computing time required for solving viscous flows over bodies with complicated configuration using N-S equations, a mixed Euler/N-S solver was proposed. The solver is capable of preserving sufficient accuracy by using N-S equations in the flow f...
Analysis of Kinematics of Delta Parallel Micromanipulator with Vector Space Method
Bi Shusheng, Zong Guanghua
2003, 29(4): 339-341.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1869
Abstract:
Delta parallel mechanism has been applied in the domain of micromanipulation since it contains only revolute joints. Kinematics of 3DOF translational parallel micromanipulator is analyzed with a vector space method. Based on Jacobian matrix,the forward and inverse kinematic singular configuration of...
Extraction of Linear Features of SAR Images Based on Fuzzy and Least Square
Wang Yanli, Chen Zhe
2003, 29(4): 342-345.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1437
Abstract:
A linear feature extraction method is proposed for SAR image. Firstly, the speckle noise in the radar image is filtered out. Secondly, the SAR image is processed by fuzzy transition and enhancement. Then, the low-pass and high-pass filters are designed by the least squares methods and the gradient s...
Experimental Research of Low Speed Aerodynamic Characteristics ofSaucerLike Lifting Body
Wang Jindong, Shen Xialing
2003, 29(4): 346-349.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 980
Abstract:
Wind tunnel experiments of a saucer-like low speed lifting-body were conducted, for the purpose of improving its low speed aerodynamic performance and investigating effects of various aerodynamic factors. Aerodynamic coefficients were measured in the wind tunnel experiments, some different methods o...
MovingPolynomial Smoother Algorithm for Telemetry FlightTest Data Processing of Pilotless Helicopter
Zheng Yi, Zhang Xiaolin
2003, 29(4): 350-353.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1611
Abstract:
Method of filtering and smoothing of the telemetry flight-test data post-processing of no-driver helicopter is discussed here. An optimal linear polynomial filter with white noise moving-polynomial algorithm is proposed to estimate the true values from telemetry signals with random noise. The degree...
Bayesian Method for Fault Diagnosis of Equipment at Lot Assure Tests
Huang Zhigang, Chen Xiaofang, Liu Zhongkan
2003, 29(4): 354-357.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 772
Abstract:
To resolve the problem of low locating rate in fault diagnosis, efforts were made by using preceding fault information fully in lot assure tests. By studying the failure rules of air-bone radio equipment in lot assure tests, the fault probability under extreme-small-sample conditions was estimated u...
SuperManeuverable Combat DecisionMaking and Simulation for a Fighter
Ye Maolin, Shen Gongzhang
2003, 29(4): 358-361.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 741
Abstract:
It is important for fighter to have good maneuver ability in air combat. A model for super-maneuverable air combat decision-making was presented based on some basic flight motions of maneuver. Several typical super-maneuverable combat simulations were conducted with an integrated flight/fire/ propul...
Dept. of Computer Science and Engineering, Beijing University of Aeronautics and Astronautics
Lin Xuelian, Liu Xudong, Huai Jinpeng
2003, 29(4): 362-365.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 812
Abstract:
The eXtensible Markup Language (XML) is going to be the common data language of distributed computing. With the broad application of XML, especially in electronic commerce, its security becomes one of the key topics of concern. The particularity of XML security was examined. A security system based ...
Development of Antenna Tracking System for Pilotless Helicopter
Jin Shi, Zhang Xiaolin, Ma Wenzhi
2003, 29(4): 366-369.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 1211
Abstract:
To make sure that the antenna points to the right direction is the basis of effective work of telemetry and telecommand system of a helicopter. The accuracy, reliability and tracking mode of an antenna tracking system are discussed, and specific problems associated with its application to the helico...
Gauss Numerical Integration in Nonlinear Analysis of Reinforced ConcreteMembers under Eccentric Compression Loading
Jiao Junting, Ye Yinghua, Diao Bo
2003, 29(4): 370-373.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 926
Abstract:
Secant stiffness matrix and tangent stiffness matrix of reinforced concrete arbitrary cross-section members with eccentric compression load are derived, on the base of plane assumption and the cross-section equilibrium equations. The secant stiffness with tangent stiffness of reinforced concrete are...
Optimal Method of Temperature Demodulation in DistributedFiber Temperature Sensor Based on Raman Rejection
Su Guobin, Li Zheng
2003, 29(4): 374-376.
Abstract References Relative Articles Resource File Access Statistics iconViews $!{v.htmlCount} iconDownload 872
Abstract:
Raman back-scattering of distributed fiber temperature sensor is very weak, stokes and anti-stokes are colored by noise after O/E convertion and amplifying. This paper presents the optimal method of temperature demodulation in distributed fiber temperature sensor based on Raman rejection, in which s...

Copyright © Journal of Beijing University of Aeronautics and Astronautics

Address: Editorial Department of Journal of Beijing University of Aeronautics and Astronautics, 37 Xueyuan Road, Haidian District, Beijing Post Code: 100191 Email: jbuaa@buaa.edu.cn

Supported by: Beijing Renhe Information Technology Co., Ltd.