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2000 Vol. 26, No. 2

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Set of New Microcomputer Aided System for Comprehensively Measuring FCG
LIU Yan-li, ZHONG Qun-peng, LU Min-xu
2000, 26(2): 125-128.
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A set of new computer aided system(CAS)programmed by C+ + and developed on X86 series microcomputer for comprehensively measuring crack growth rate is briefly introduced and some part of algorithms for data process and the selection technique of load-variation are given.The CAS mentioned above can b...
Precise Estimation Method of Pseudo Random Code Delay of Spread Spectrum System in High Dynamic Environment
LI Xiao-min, LIU Hui, CHENG Lee-lung, ZHANG Qi
2000, 26(2): 129-132.
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The problems met in high dynamic environment during direct spread spectrum system measuring pseudo-random (PN) code delay are analyzed, and the effect of Doppler frequency shifted on PN code delay is studied emphatically. Carrier phase and frequency of high dynamic direct spread spectrum signal are ...
Pspice Circuit Temperature Model of the Quantum Well Laser
YANG Wen-ge, LI Zheng
2000, 26(2): 133-136.
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By researching the temperature characteristics of the quantum well laser, the rate equation of quantum-well laser is modified, and in the rate equation, these currents which are contacted with temperature are added. These currents include radiative recombination current and nonradiative recombinatio...
C-R Spline Fitting Theory for the RCS Computation \=of Low-Scattering Targets
NING Huan-sheng, YANG Zhi-ling, WANG Bao-fa
2000, 26(2): 137-140.
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The geometric modelling and electromagnetic scattering characteristics of complex targets are discussed. In order to overcome the insufficiency of some other spline functions, the contour fitting of the targets was made conveniently and correctly by using Catmull-Rom spline fitting function. To the ...
Adaptive Clutter Suppression for Non-Side-Looking Airborne Phased Array Radar
LI Chun-sheng, ZHOU Yin-qing
2000, 26(2): 141-144.
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The clutter suppression methods of spatial-temporal adaptive signal processing for non-side-looking airborne phased array radar is studied. On analyzing the non-side-looking spatial-temporal clutter distribution properties,three practical processors are presented based on spatial and temporal repeti...
Improved AMI Code Used in Telemetry System
AMI Code, YANG Dong-kai, WEI Ke-ping
2000, 26(2): 145-148.
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An improved AMI code being suitable for telemetry system is proposed. It is realized through inserting redundancy Bit into the binary data stream to be synchronized rapidly and steadily. It has no long continuous zeroes. Its properties are analyzed, such as code efficiency, error Bit rate, power spe...
Hybrid Petri Nets and Analysis of Its Reachability
LI Hui-feng, ZHOU Rui, CHEN Zong-ji
2000, 26(2): 149-152.
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Hybrid system is a type of sophisticated system which consists of interactive discrete event dynamic systems and continuous variable dynamic systems. A new type of hybrid Petri net is proposed, which can not only describe and analyze deterministic discrete events, but also deal with the concurrent p...
Aircraft Engine On-Line Wear Monitor Based on Isotope X-Ray Fluorescence Method
YUAN Mei, Lü Jun-fang, CHEN Xing-lu, ZHANG Jiang-ping
2000, 26(2): 153-155.
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An OLWM(On-Line Wear Monitor) of aircraft engine based on IXRF(Isotope X-Ray Fluorescence) method is illustrated. The lubrication oil of running engine has plenty of wear debris. IXRF method can detect the composition and content of different metal on-line, according to the principle that different ...
Real-Time Distributed Simulation of Aircraft Anti-Skid Control System
ZHAO Hai-ying, WANG Zhan-lin, QIU Li-hua
2000, 26(2): 156-159.
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Firstly,the work fundamentals of anti-skid braking system have been analyzed in detail. The mathematical model of the system has been set up. On the basis of it, the simulation research was made to the system by adopting the real-time distributed simulation system. It has also given the structure sc...
Scheme Analysis of Fly-by-Light of Airborne Actuation Systems
QI Xiao-ye, FU Yong-ling, WANG Zhan-lin, WANG Yi-qun
2000, 26(2): 160-163.
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An overview is given of the FBL(Flight By Light) scheme currently developed for airborne actuation systems. After paralleling the benefits of FBL with demands of the flight control system of future aircraft, the necessity of developing FBL technology is pointed out. Considering the present status of...
Robust Controller Design and Research on Airplane Anti-Skid System
ZHAO Hai-ying, WANG Zhan-lin, QIU Li-hua
2000, 26(2): 164-166.
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Firstly, the system has been analyzed in detail and the mathematical model has been given. The second problem is how to improve the robustness of the system. When the airplane is running on the runway, the tyre/runway characteristic will be disturbed by various time-variant or uncertain factors, suc...
Bases of Judging the Failure of Squeeze Film Damper
LIU Fang-jie
2000, 26(2): 167-170.
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If the design of squeeze film damper is not properly,it will be causing the failure of its functions. There are two cases of failure of the elastic support-squeeze film damper:one is the bistable character being take place,the other is unable to stride over the critical state,i.e.,the amplitude of t...
Experimental Study on the Flow Patterns of a Simplified Aircraft Model at High Angles of Attack
WANG Jin-jun, XUE Qi-zhi, BAI Tao, FENG Ya-nan
2000, 26(2): 171-173.
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The dye-injection flow visualization technique has been used to study the changes of flow patterns for a simplified aircraft model with the variation of angles of attack and the incoming flow velocity in a water tunnel. In this experiment, the changes of flow patterns do not have essential differenc...
Method for Predicting Rotor Vortex Wake and Downwash Velocity Field
CAO Yi-hua
2000, 26(2): 174-177.
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An analytical method for predicting rotor vortex wake in low speed and hovering flight is described to investigate the motion of the helical tip vortex. Beginning with the prescribed wake model, a Semi-Empirical Correction for the vortex core effect on rotor wake is made and free wake calculation is...
Design and Analysis Expert System of Airplane Structure Durability
ZHAO Yao-wu, LIU Xiao-dong, JIANG Dong-bin, LIU Wen-ting, WANG Fan
2000, 26(2): 178-181.
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In order to satisfy the need of rapid development of modern airplane design,the development process of expert system is presented for airplane structure durability design and analysis with Visual C+ + language. This expert system includes knowledge base formed by organizing existed expert's knowledg...
Numerical Prediction of Moduli of 3-D and 4-step Braided Composites
LIU Zhen-guo, LU Meng, MAI Han-chao, LU Zi-xing, FENG Zhi-hai
2000, 26(2): 182-185.
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The parameterized modeling technology for three dimensionally and 4-step braided composites is studied. First, the ""-type model of a representative unit cell is presented for FEM numerical prediction, which more really simulates the inner meso-structures of the materials because of considering the...
Influence of Grid Structure on the Euler Solution
LI Jin, ZHU Zi-qiang, WU Zong-cheng, CHEN Ze-min
2000, 26(2): 186-189.
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Using two types of patched grids, the influence of grid structure on the Euler solution of the flow around a wing with aileron deflection is discussed. One type is a partially discontinuous grid (PDG) and the other is a completely continuous grid (CCG). Van Leer's flux-vector splitting scheme and Ja...
Generation of the 2D Unstructured Grids and the Euler Solution on It
WANG Ping, ZHU Zi-qiang
2000, 26(2): 190-193.
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Computational unstructured grid is generated by advancing front method, and the structured background gird is obtained by using multigrid technique to solve the Poisson equation. A new method of boundary discretization is presented for generating the initial fronts, and a novel data structure—Array ...
2D Multiblock and Parallel Method to Solve Transonic Euler Equations
Lü Xiao-bin, ZHU Zi-qiang
2000, 26(2): 194-197.
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Two-dimensional domain decomposition method and parallel computing method are applied to solve Euler equations on networked computers. The Van Leer-s Flux-Vector-Splitting method is applied. All the variables are stored in one-dimensional order, so the domain decomposition can be made arbitrarily. N...
Assessments of Air-to-Surface Operational Effectiveness for Aircraft during Combat Sortie
MA Dong-li, HAN Ying
2000, 26(2): 198-200.
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Operational effectiveness analysis of aircraft is one of the important research texts on military equipment. The determining methods of accessible zone of airborne air-to-surface missile and first attacking probability are described. The mathematical models are established to describe operational ef...
Model for Speech Recognition Based on Multiple Time Scale Features
HAN Jiang, YIN Bao-lin
2000, 26(2): 201-205.
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The model explicitly models the correlation among successive frames of speech signals in segment scale by using segmental features representing contours of spectral parameters. By using the proposed segmental feature dependent non-stationary time series model, the new model not only achieves the mod...
Implementation of Dual Languages Specification for Idea of Separation of Concern with OOD
SUN Wen-yan, XIONG Zhang, SONG Jing-min
2000, 26(2): 206-209.
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A new idea of formal specification named "separation of concern" has been discussed. The dual languages technique based on this idea has also been analyzed. Compared with traditional single language technique, "separation of concern" and dual languages techniques are more suitable to represent the d...
Evaluation Method for Projects of Product Conceptual Design
HAN Xiao-jian, DENG Jia
2000, 26(2): 210-212.
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Evaluation method for projects of product conceptual design is an important gist for acceptant decision-making of design process. Using method and theory of fuzzy mathematics and making various fuzzy information to numerical value, projects of conceptual product are evaluated in ration. By establish...
PC/DSP Based Open System Architecture Intelligent Machining Module
LIU Qiang, Yusuf Altintas
2000, 26(2): 213-217.
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The structure and functions of open system architecture intelligent machining module(OSA-IMM) are investigated based on PC and DSP. The key strategies to realize the openness of the system are discussed. The signal processing network(SPN), reentrant plug in module(PIM), script command file(SCF) and ...
Mechanism Analysis and Empirical Study of Second Mover Advantage of Imitative Innovation
YUAN Zhi-shan, GAO Yuan-yang, CHEN Liang-you
2000, 26(2): 218-220.
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It is true that the second mover has the advantage over the first mover on certain condition. The single or multi-product growth pattern of imitative innovation project with R&D increasing was founded by analyzing the quantity relationship between the R&D input accumulation and project outpu...
Analysis of Growth Pattern in Typical Imitative Innovation Institution
YUAN Zhi-shan, GE Zi-gan, CHEN Liang-you
2000, 26(2): 221-223.
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Based on the analysis of the actual statistical data of the product values of five representative imitative innovation projects in time sequence, the growth pattern of the imitative innovation project in the representative aeronautical institution (BIAM) was set up. The model was checked with the ac...
Three Parts about Cooperated Software Development Activity Management
CHEN Qian, LIU Hui, FENG Yun-cheng, DAI Gui-liang, ZHANG Chang-chun
2000, 26(2): 224-227.
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For cooperated software development activity management based on network, following contents are researched: how to build a cooperated working environment between developer teams and develop a software management information system of supporting activity management, how to give a task partition and ...
All Optical Real Time Three Dimensional Color Image Optical Fiber Sensor
LI Ying-zi, ZHANG Jia-hua
2000, 26(2): 228-230.
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The resolving power of optical fiber image transmission (OFIT) is studied, and a solution is provided in view of the problems coming up from that. Both the working principles and experimental outcome are introduced. The result shows that three-dimensional color image optical-fiber sensor which takes...
Approximate Limit Sampling Data Using Fuzzy-Tree Model
MAO Jian-qin, ZHANG Jian-gang, DAI Ji-yang, WEI Ke-hui
2000, 26(2): 231-234.
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A linear binary fuzzy tree structure approach, i.e. Fuzzy-Tree model, is proposed for complex nonlinear system modeling. In comparison with some other modeling approaches, such as ANFIS and Neural Network model, the proposed model is of less computation, higher accuracy, especially insensitivity to ...
Bifurcation of a Quadratic Integrable System under Quadratic Conservative Perturbations
PENG Lin-ping
2000, 26(2): 235-238.
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The question on bifurcation of limit cycles in quadratic conservative perturbations of a quadratic integrable system is discussed. As a result of conservative perturbations, the first order Melnikov function for a perturbed system is identically equal to zero, so the second order Melnikov function h...
Static Shape Control of Adaptive Structure Using Composite Laminated Piezoelectric Element
TANG Ji-ye, HUANG Hai, XIA Ren-wei, HUANG Hai-bo
2000, 26(2): 239-243.
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The static shape control of composite plate adaptive structure was studied. Using the piezoelectric composite laminated plated element, the displacement sensitivity matrix was established. Then,the optimal control equations were derived from the sensitivity matrix. If there were same number of contr...
Solar Panel Substrate Planeness Measuring System
FANG Jian-cheng, ZHU Shi-ping, ZHOU Rui, YU Wen-bo, SHEN Gong-xun
2000, 26(2): 244-248.
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A solar panel substrate planeness non-contact system is presented, which employs optical triangulation method and bases on virtual precise benchmark. By means of declinate optical triangulation measuring instrument structure which is firstly proposed, the measured area and resolution of this measuri...

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