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2002 Vol. 28, No. 2

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Algorithms for Surface Smoothing in Reverse Engineering
XI Ping, LIU Yong
2002, 28(2): 125-128.
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Surface smoothing is one of the important technologies of reverse engineering. This paper introduces a set of simple and useful algorithms for surface smoothing, including disposing error points, step smoothing, hand smoothing and automation smoothing, relationships among these algorithms and skills...
Study on Availability Analysis for Repairable System
KONG De-liang, WANG Shao-ping
2002, 28(2): 129-132.
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An availability analysis method for repairable system i.e. Dynamic Fault Tree Analysis(DFTA) was presented .To achieve high reliability and availability, redundant hardware and fault-tolerant software associated with dynamic process, time sequence, backup and failure recovery were adopted in the com...
Effectiveness of Weaving Maneuver Strategy of a Missile
JIANG Yu-xian, CUI Jing
2002, 28(2): 133-136.
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Effectiveness of weaving maneuver strategy of a missile when it passes through a Missile-Defence-System(MDS) is addressed. A linearized planar engagement model is used. Closed form solutions for the miss distance of interceptor are derived from the case where the interceptor's guidance system is mod...
Diagnose of Noise Fatigue Sources of a Helicopter
XIONG Jun-jiang, SHANG Da-jing, GUO Ai-min
2002, 28(2): 137-140.
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According to the wavelet transformation theory, a diagnose method for helicopters is established, including the order number of the wavelet decomposition and reconstruction, the noise signal decomposition, the separate signal reconstruction and 1/3 times frequency calculation. Since this method is w...
On the Analysis and Design Method of System Safety
XIONG Jun-jiang, LIU Bao-cheng, GAO Hong
2002, 28(2): 141-143.
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Based on the logical relations among its four major contents and a qualitative approach of system safety analysis and design, a new method for the treatment of a secondary failure, multiple failure and hidden failure in FHA and FMEA were proposed. Moreover, a mean rank method for the quantitative an...
Prediction of Output SNR of Analog Optic Receiver
NI Nan, SU Guo-bin, LI Zheng, LIU Jian-sheng
2002, 28(2): 144-148.
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The amplitude-frequency characteristic of transmission function of APD GaAsFET analog optic receiver is usually nonideal in stopband. For this reason, the output Signal Noise Ratio(SNR) is often lowered. A method is proposed to analyze and calculate the lowered output SNR caused by the nonideal st...
Methods of Integrating and Constructing Distributed Service Objects on Web
LANG Bo, HUANG Rui, LI Wei-qin
2002, 28(2): 149-152.
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It is very important to realize distributed service objects sharing on Web. CORBA and Java are the two supporting technologies in achieving this aim. This paper first puts forward the integration framework of distributed objects, with the idea of integrating CORBA, Java and Web together. Then, it de...
A Taylor Series Method in Nonlinear Structural Dynamics
ZHAO Li-bin, ZHANG Jian-yu, WANG Shou-mei
2002, 28(2): 153-156.
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A Taylor series method for solving nonlinear structural dynamics problems where nonlinear items can be expressed as a polynomial with multiple variables was established. Different from existing methods, the Taylor series method satisfies governing equations in continuous intervals rather than at dis...
High-Speed Image Acquisition Technology in Vision Inspection
ZHOU Fu-qiang, ZHANG Guang-jun
2002, 28(2): 157-160.
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A hardware implementation solution to image acquisition in vision inspection based on special video decoder SAA7111 and FPGA (Field Programmable Gate Array) was proposed. Interfaces among the image acquisition system, the computer and the font-end hardware processing system were successfully complet...
Modeling and Control of Attitude Dynamics of a Space Station with Changing Structure
ZHAO Chao, ZHOU Feng-qi, ZHOU Jun
2002, 28(2): 161-164.
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First, a quasi-coordinate Lagrange method was employed to derive a mathematical model for a space station with a fixed structure containing flexible appendages. Then, taking into account the characteristics of structure change, a mathematical model for a space station with changing structure was gen...
Stable Dynamic Mode of Inverted Pendulum Systems
YANG Ya, ZHANG Ming
2002, 28(2): 165-168.
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A concept about the dynamic mode of an inverted pendulum system when it is stabilized was proposed.The main dynamic modes of single,double and triple inverted pendulum systems with a single motor were concluded through analyzing their physical structure.On the basis that these systems can be stabili...
Realization of an Air Combat Simulation System Based on DIS
ZHANG Shan, WANG Xing-ren
2002, 28(2): 169-172.
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To meet the need of evaluating fight efficiency of modern aviation weapon systems, a scheme of air combat simulation system based on distributed interactive simulation (DIS) was presented. With describing the architecture, the function divisions and the critical technology points of the scheme, an e...
Influence of Streamwise Vortex on Turbulence Characteristics of Endwall Flow in a Compressor Cascade
LIU Huo-xing, CHEN Mao-zhang, JIANG Hao-kang
2002, 28(2): 173-177.
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To understand the influence of streamwise vortex on turbulence characteristics, the turbulence characteristics of flow in the corner region of a compressor cascade passage were measured by using a three-dimensional Laser Doppler Velocimetry system. The result indicated that the turbulence kinetic ha...
Planning of Conflict-Free Motion for Multiple Robots in Structured Environment
ZHAN Qiang, CHOU Wu-sheng
2002, 28(2): 178-180.
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A real-time conflict-free motion planning method, i.e. priority based rules method, was proposed for multiple mobile robots conducting individual tasks in one structured environment. By taking the advantages of rules method and priority method, the present method can not only make robots avoid colli...
Structure Characteristics of Phosphorus-Doped Hydrogenated Nano-Crystalline Silicon Films
WANG Jin-liang, XU Gang-yi, WANG Tian-min
2002, 28(2): 181-185.
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B-and P-doped hydrogenated nanocrystalline silicon films (nc-Si:H) were generated by plasma enhanced chemical vapor deposition (PECVD). Effects of technique parameters on the microstructure and physical properties of the films were examined. The microstructure of the nc-Si:H films were studied by me...
Automatic Testing of Radio Altimeters by VXI Bus Technology
HUANG Zhi, LIU Zhong
2002, 28(2): 186-189.
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A scheme to test air borne equipments automatically was proposed based on VXI bus technology. The function and structure of the scheme were described by taking two common types of radio altimeters as examples. With introducing the key techniques involved in the scheme, an idea to improve the poor me...
Characterization of 3-D Surface Topography by Root-Mean-Square Wavelengt
LI Cheng-gui, LI Xing-shan
2002, 28(2): 190-193.
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Based on fractal geometry theory, a root-mean-square(RMS) wavelength method was proposed to quantitatively evaluate a 3D stochastic surface topography, by means of the surface spectral moments. Through DFT of the profile measured by a Talysurf-10 contact stylus instrument, we obtained the power spec...
Study on Automatic Selection of Current Images
SU Hui-min, GAO Jian-hong, CHEN Zhe
2002, 28(2): 194-197.
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Automatic selection of Current Image (CI) is a key technology for automation of scene matching navigation system. An algorithm for automatic selection of CI based on 3-layers BP net integrated with Sobel template and on neural network was proposed. The simulation results indicated that the algorithm...
A Method to Simplify Fuzzy Logic System Structure Based on Rule Sensitivity
SUN Duo-qing, HUO Wei
2002, 28(2): 198-201.
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A method to simplify fuzzy logic system (FLS) structure was presented based on rule sensitivity. With introducing the concept of rule sensitivity, a new function was constructed and added into objective function to get a penalty function.In this way, a new performance index was obtained. Then, fuzzy...
Probability Damage Tolerance Analysis for Structures with Multiple Fatigue Cracks under Corrosive Environment
ZHANG Jian-yu, FEI Bin-jun
2002, 28(2): 202-204.
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Analyzing damage tolerance capability of structures with multiple fatigue cracks is an important task for the current assessing of structural fatigue reliability of aging airplanes. Based on probability damage tolerance theory for structures with multiple fatigue cracks under normal environment, a p...
Study on Reliability and Mean Safety Coefficient of Components
JIA Xing-lan, LIU Wen-ting
2002, 28(2): 205-207.
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Based on stress-strength interference model, calculation formula of reliability and mean safety coefficients and their relationships are derived, corresponding to different distributions of stress and strength. Through practical calculations it is shown that, when the distributions of stress and str...
A Real-Time Image Transmission Scheme for Pilotless Aircraft
LIU Rong-ke, ZHANG Xiao-lin
2002, 28(2): 208-212.
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In the present scheme, an integer wavelet transform algorithm with modified set partitioning in hierarchical trees(SPIHT) coder was introduced to compress images. RS, symbol interleaves and trellis coded modulation(TCM) with multi-level quadrature amplitude modulation(QAM) were used to get an excell...
A Multi-Mode Self-Adaptive Compression System for Color Images Based on Low Pass Filter
A Multi-, YANG Bo
2002, 28(2): 213-216.
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To overcome the drawbacks of available techniques in rapid real-time processing of color images, a color image compression system with higher processing rate and higher PSNR was put forward. It was found that with the rotation of YUV space, the chromatogram of an original image can be changed and so...
Aeroengine Multi-Rotors Dynamics Optimum Design——Model and Tool
MA Mei, LI Qiang-hua, WANG Rong-qiao
2002, 28(2): 217-220.
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Based on detail analyzed an optimization model of rotor dynamics of aeroengine multi-rotors system, the sum of weight of normal subjection function of fuzzy sets theory was used to describe the distribution of multi-order critical rotor speeds versus multi in common used operating speeds, and to for...
Factors Affecting the Precision of Heterodyne Interferometer
ZHAO Hui-jie, ZHANG Guang-jun
2002, 28(2): 221-224.
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Non-linear errors resulted from mis-installation of common-path heterodyne interferometer affect the precision of its measurement system. Four factors which can lead to such non-linear errors were identified,they are the frequency mixing, the phase jump of different metals to be measured, the tilt o...
Decoupling Control of Aircraft Environmental Control System with High Pressure Water Separation
HE Jun, ZHAO Jing-quan, YUAN Xiu-gan
2002, 28(2): 225-227.
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Aircraft environmental control system(ECS) with high pressure water separation is a representative complex coupling control system of MIMO. Flight-tests proved that the controlling means with conventional PID control could not refrigerate the electronic equipment and the cabin satisfactorily. An att...
Electromagnetic Compatibility Analysis of Plane Antennas
SU Dong, WANG Dong, WANG Ming, SUN Cong
2002, 28(2): 228-230.
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On the assumption that a cabin and a horn antenna were under the bottom of an airplane, FDTD method was applied to analyze the antenna patterns which are generally affected by the body of the airplane. By adjusting the relative positions between the body and the antenna, some interesting results wer...
On the Convergence of Finite Element Method with Different Extension-Compression Elastic Modulus
LIU Xiang-bin, MENG Qing-chun
2002, 28(2): 231-234.
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For finite element method with different extension-compression modulus,this paper discusses the influence of modulus of elasticity in shear on the convergence of numerical calculation, and puts forward a method relating not only the sign but also the dimension of the principal stress to the modulus ...
Design and Research of High-Lift Mild-Stall Airfoils
KONG Fan, HUA Jun, XIANG Jin, ZHANG Zhong
2002, 28(2): 235-237.
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Design research of high-lift, mild-stall airfoils (BUAA-K1/BUAA-K2) was conducted in order to investigate their design strategy, methods and technology for a long-endurance aircraft. Wind-tunnel experimental results indicated that, while keep satisfactory aerodynamical features of high lift and mild...
Numerical Simulations of the Combined Effects of Atomic Oxygen and Ultraviolet on Polyimide
GAO Shao-lun, SUN Bing, ZHU Cheng-min, ZHOU Ding
2002, 28(2): 238-241.
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Based on a mathematical mode proposed by the authors to describe the physical interactions of atomic oxygen and ultraviolet with polyimide, numerical simulations of their combined radiation effects on polyimide with and without coated layers in Low Earth Orbit (LEO) and ground experiment environment...
An Approach-Search Algorithm Used in GPS Single Frequency Kinematic Relative Positioning
YU Wen-bo, GAO Guo-jiang, ZHAO Yan
2002, 28(2): 242-244.
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To compensate the low reliability of normal search algorithm of Real Time Kinematic positioning(RTK) technology, an approach-search algorithm is proposed. This algorithm is based on a set of double difference equation of each epoch. By decomposing these equations, this real-time algorithm can integr...
A New Algorithm of Multi-Shadowed Projective Area and Its Application in Fighter Aircraft Vulnerability Analysis
XU Yuan-ming, LONG Wei, WANG Yong
2002, 28(2): 245-248.
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An accurate surface model for an aircraft and its components was constructed by using B-spline theory. The model can be discretilized into triangle surface elements, relationships among geometrical elements were represented with the improved winged-edge structure. Based on inclusion-exclusion princi...

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