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2000 Vol. 26, No. 3

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Numerical Simulation of Temperature Field for Investment Casting Solidification Process
WANG Gui, YANG Li, ZHOU Tie-tao
2000, 26(3): 249-251.
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After studying the specific property of the investment casting , the 3-D numerical simulation of temperature field based on the finite difference method (FDM) for the solidification process of investment casting has been developed by dealing mold/environment boundary and riser/ environment boundary ...
Lossless SAR Image Compression Using Integer to Integer Wavelet Transform
WANG Zu-lin, ZHOU Yin-qing
2000, 26(3): 252-255.
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Three advantages of wavelet transform constructed with lifting scheme are introduced and then invertible wavelet transform pairs of several integer to integer have been given. After discussed the features of SAR image, a method for lossless compression of SAR image by means of integer to integer wav...
Multifractal Spectrum and Calculation
WANG Zu-lin, ZHOU Yin-qing
2000, 26(3): 256-258.
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Multifractal theory is an effective tool for the singularity processing of signal, but only a few special sets have analytic multifractal spectrum expression. The calculation of multifractal spectrum is important and difficult. This paper introduces one of the formal system of multifractal theory in...
Designing Simulation of RF Low Noise Amplifier
LIU Jiu-wen
2000, 26(3): 259-262.
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A design approach of low noise amplifiers (LNA), which are employed in the receiving terminals of radio frequency integrated circuits (RFIC), based on HP's EESOF simulation software is studied. In this design example, a HP's GaAs FET (HP ATF21186) is applied. The required satisfactions are: entire g...
Study of Multipul-Target Telemetring System Scheme
CHENG Ji-kuan, CHEN Ling
2000, 26(3): 263-266.
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This paper firstly proposes the multipul-target telemetring scheme using DS/CDMA system on the basis of the requirement of the system ,then detailedly presents the operating principle and the key technology of the multipul-target telemetring system .In addition ,the block diagram of the system is sh...
Study of the Channel Access Parameters for VHF Air-to-Ground Datalink
ZHANG Jun, FANG Xin, ZHANG Qi-shan
2000, 26(3): 267-269.
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The system throughput and the message transmission delay influenced by the channel access parameters under various channel access rules is studied in this paper. The analysis is based on the model of channel access state transition for VHF air-to-ground data-link and CSMA matrix analysis method. The...
Intelligent Transport System and Its Informatics Model
YANG Dong-kai, WU Jin-pei, ZHANG Qi-shan
2000, 26(3): 270-273.
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ITS(Intelligent Transport System) is a new transport system evolved from the traditional traffic engineering. The research object of ITS is the spatial and time relationship of people, vehicle, road and environment which are named four transport elements together, and it is called transport informat...
Research on the Relation Between the Seeker's Handover and the Geometrical Position of the Missile and the Target
QU Jian-ming, MAO Shi-yi, LI Shao-hong
2000, 26(3): 274-277.
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A single error angle model of seeker’s pointing angle is proposed first, which is different from two error angle model in that it’s easy to analyzed the beam pointing error by just analyzing the single error angle. The optimal geomet rical position between the missile and the target at handover is d...
Studies on Several Key-Problems of the Swift Target Acquisition in Array Radars
XU Bin, YANG Chen-yang, QU Jian-ming, LI Shao-hong
2000, 26(3): 278-281.
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Two key-problems,angle measurement and angle prediction, of the swift target acquisition in array radar are studied. Firstly, from the respect of required beam arrangement, discrimination feature and the performance of angle measurement, the two algorithms named amplitude-comparison monopulse-like a...
Effects of Stability of Antenna Pointing on Spaceborne SAR Imaging Quality
HUANG Yan, LI Chun-sheng, CHEN Jie, ZHOU Yin-qing
2000, 26(3): 282-285.
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The stability of antenna pointing is researched from the viewpoint of the effects of antenna pointing instability of spaceborne synthetic aperture radar(SAR) on image quality. Based on uniformity weighting antenna, the location and amplitude of the paired-echo resulting from instability of antenna p...
Modal Technique in Time Domain for the FDTD-Diakoptics
SU Dong-lin, Lü Shan-wei, ZHANG Qi-shan
2000, 26(3): 286-289.
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A modal technique in time domain for the FDTD-Diakoptics is proposed. Based on modal functions in time domain, which are formed according to geometries of structures, a microwave circuit is equivalent to a multi-mode circuit. Full-wave analysis method is used to get the time domain responses ofthe m...
S-Band MMIC Amplifier Design Using HEMT
YANG Xue-bin, Lü Shan-wei, SU Dong-lin, WANG Liang-chen
2000, 26(3): 290-292.
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The design procedure of S-Band microwave monolithic integrated circuits (MMIC's) amplifier using high electron mobility transistors (HEMT's) is proposed. The topology of the circuit designed is taken into account in order to guarantee the stability. A 200Ω resistance is parallel with the drain port ...
Analysis of Mutual Coupling of Superstrate-Loaded Cylindrical-Rectanular Microstrip Antennas
LIU Zhang-fa, Lü Shan-wei
2000, 26(3): 293-295.
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The mutual coupling between microstrip antenna elements has affected the performances of microstrip arrays, on the other hand, substrate cover or superstrate-loaded on microstrip arrays is necessary to prevent the damage of nature or man made. The effect of substrate cover should be considered when ...
Two-Dimensional Angles Estimation of Wide-Band Signals with Spatial-Temporal DFT Projection
SI De-yi, SHEN Shi-tuan, LIU Rong-ke
2000, 26(3): 296-298.
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A new method of estimation two-dimensional angles of wide-band arrival signals is presented with spatial-temporal DFT projection. The sensor array is consisted of three coplanar uniform linear arrays (ULA). For every ULA, the wide-band signals are sampled in spatial and temporal, then 2-D discrete F...
Application of GPS/INU/GIS Integrated Location and Navigation Technologies in Intelligent Transport Systems
ZHANG Fei-zhou, FAN Yue-zu, SUN Xian-fang
2000, 26(3): 299-302.
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The basic idea of intelligent transport systems(ITS) is introduced in this paper. GPS/INU/DM integrated navigation & location technology and its application in ITS are described. In addition, several technical measures to increase integrated navigation & location precision and reliability ar...
Research on Coding of Road Information in ITS
SHI Yan-shan, WANG Ke, FAN Yue-zu
2000, 26(3): 303-306.
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The code of road information is analyzed, based on the data provided by a model of the traffic volume. The method to compress data is equivalent conversion of the initial source, so the probability distribution of the equivalent conversed source becomes more sequential with less entropy value and gr...
Consideration in the Electromagnetic Design of Brushless DC Motor for Flight Control
ZHU Yao-zhong, WANG Zi-qiang
2000, 26(3): 307-310.
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Development of the electromechanical actuation system for use in primary flight controls is one of the major technologies in the path to an all-electric airplane. Brushless DC motor(BLDCM) is the key in this system. In BLDCM designs, the use of samarium cobalt magnet can significantly reduce motor m...
Stabilizing Triple-Inverted Pendulum Using Computer
YANG Ya-wei, ZHANG Ming-lian
2000, 26(3): 311-314.
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Personified intelligent control idea based on the physical model of system is proposed in this paper.Qualitative control law is acquired through the qualitative analysis of system model.The personified intelligent idea is applied to adjusting the control law by observing the dynamic behavior of syst...
Neural-Network Control of Agile Missile
JING Shao-guang, WANG Qing, SONG Zi-shan
2000, 26(3): 315-317.
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A neural network based controller of agile missile capable of high angle of attack flight is presented. Super agility is needed in close-in combat. For the missile to possess super agility (high angle of attack capability) some form of alternate control is needed, vectoring the thrust (or using reac...
Study of Digital Control in Electrohydraulic Sero Loading System
JIANG Jia-he, YU Tong-wu, SONG Zi-shan
2000, 26(3): 318-320.
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This paper discusses the application of digital control in electro-hydraulic Servo loading system.With a microcomputer and a A/D and D/A module,applying a open-closed loop optimized design method, the control in electro-hydraulic servo system is realized. Besides, some PID algorithm is studied. It i...
Flight Simulation System of Large Civil Aircraft Based on Network
LIU Li, PENG Xiao-yuan, WANG Xing-ren
2000, 26(3): 321-324.
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With a flight simulation system of large civil aircraft developed by the Simulation Research Division at the Beijing University of Aeronautics and Astronautics, this paper introduces its hardware composing and network topology. The distribution of the simulator cockpit, the functions and distributio...
Study on Missile-s RCS Calculation
ZHANG Yun-fei, WU Zhe, LU Zhu-hui
2000, 26(3): 325-328.
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High frequency scattering theory, including physical optics, physical theory of diffraction and equivalent electric current theory, were used to calculate the radar cross section of various scattering resources of missiles, such as flat plate, circular cylinder, quadric surface, edge and so on. Comb...
Numerical Modeling of the Explosive Decompression Process with MSOGS
YANG Feng, LIN Gui-ping, XIAO Hua-jun
2000, 26(3): 329-332.
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A simple mathematical model about the dynamic variation of alveolar oxygen partial pressure during explosive decompression is established in this paper. With this model the process of alveolar oxygen pressure change during explosive decompression process is simulated with molecular sieve oxygen gene...
General Scheme of Aircraft Intelligent Hydraulic Pump System
CHEN Bin, WANG Zhan-lin, QIU Li-hua, FEI Bin-jun
2000, 26(3): 333-336.
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High-pressure, high-power, and so on are the main development trends of aircraft hydraulic system. Based on the traditional constant pressure variable flow pump system, the high-pressure and high-power of the system will surely lead to an increase of non-effective power, then it's temperature will i...
Technology of Modeling for Shape Memory Alloy Reinforced Composites
SU Zhong-qing, MAI Han-chao, LU Meng
2000, 26(3): 337-339.
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Based on a lot of experiments on the thermo-mechanical properties of shape memory alloy reinforced composites, which have already been applied in some intelligent structures, the quadrangular and triangular models are established in this paper, and the corresponding formulae of Finite Element Method...
Research on the Numerical Simulation of Aircraft Carrier Air Wake
PENG Jing, JIN Chang-jiang
2000, 26(3): 340-343.
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A model of carrier air wake is selected to simulate the spatial distribution of velocity of air wake in MATLAB on a PC for study of environmental effects on approaching and landing of the carrier base aircraft. The air wake can be divided into four components according to their causes: the power spe...
Structure Optimization Design Study of Fuselage Main Frame
XIE Yong-he, WU Wen-zheng
2000, 26(3): 344-347.
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The method of optimization theory based on dual method was transplanted to design fuselage main frame, and the optimizing model of fuselage main frame was established. The target function is the weight of fuselage main frame. There are three kinds of constraints: dimension, strength and flexural rig...
FE Contact Search Model Research in Sheet Metal Forming
WANG Xiao-lin, ZHOU Xian-bin
2000, 26(3): 348-351.
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On the basis of the parametric curved-surface tool description and finite element meshing tool description, a curved-surface & element description method for the tool geometric shape model is established. An updated global & local contact search algorithm is introduced. An optimized selectio...
Research and Practice of PPOR Model of Product Data Management System
ZHOU Chang-sheng, WANG Xu-hai, ZHAO Yong-shun, DENG Jia
2000, 26(3): 352-356.
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Due to sharply increase on quantity and volume of product data in product design processes,enterprise must improve management on those product data. In spite of depend on different point of view of product data management,various product data management system is developed,but still some basic chara...
Pilot Study of Aircraft Configurations Control
YANG Xi, FAN Yu-qing
2000, 26(3): 357-360.
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In order to effectively manage the complicated aircraft configurations in modern aircraft manufacture industry and to resolve the difficult problems on aircraft configurations control in product data management, the characteristics of modern aircraft manufacture and the questions brought forward to ...
Study on Evaluating Arithmetic of Network Solving for Product Conceptual Design
HAN Xiao-jian, DENG Jia
2000, 26(3): 361-364.
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product conceptual design is a complicated process of reasoning solution and its workload of reasoning、verdict of design process often is very huge.Using a expression method of knowledge of "And/Or" tree, a embedded study of principle solution of product conceptual design process and its evaluation ...
Robust Control of Interval Discrete Systems
ZHANG Yuan, JIA Ying-min
2000, 26(3): 365-368.
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The edge check results of the continuous interval systems are first extended to the interval discrete systems by employing the convex analysis way of value set. Further, in order to obtain some vertex check results, the discussion is limited to such a case when only lower-order coefficients of trans...
Imperfect Bifurcation of One-Dimensional Vector Field with a Time-Dependent Parameter
HUA Cun-cai, LU Qi-shao, WANG Qi
2000, 26(3): 369-372.
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A new and simple method is proposed for studying an imperfect bifurcation problem of one-dimensional vector field with a time-dependent parameter. A basic method of scaling balance is established. By combining this method with the continuity of the solutions of ordinary differential equations with r...

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