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2000 Vol. 26, No. 6

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Study on Stability of PolymerBased PTC Composites
WANG Ji-e, LI Xiao-bing, JI Xiao-qiang, XIE You-hua
2000, 26(6): 621-623.
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The objective in studying and using polymer-based PTC (Positive Temperature Coefficient) materials is to increase PTC intensity of conductive composites and stabilize the reproducibility of the room temperature resistivity. On repeated heating cycling through the switch temperature or above it, the ...
Novel Inhibitors of Microbiologically Inducing Corrosion of A3 Steel in Anaerobic Environment
LIU Jian-hua, LI Song-mei, YANG Ying-guang
2000, 26(6): 624-627.
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The effect of sterilization of four inhibitors(BHA-1,BHA-2,BHA-3,1227)and the behaviors of microbiologically inducing corrosion of A3 steel in 3.5%NaCl solutions with and without sulfate-reducing bacteria(SRB) in anaerobic conditions were investigated by using microbiologic method, weight-loss metho...
Electron Beam Curing and Its Application in Processing Field of Advanced Composites
MAO Shu-li, SUI Gang, ZHONG Wei-hong, ZHANG Zuo-guang
2000, 26(6): 628-632.
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In this paper,radiation curing and photo curing are compared.The fundamental process of electron beam (EB) curing is elaborated,and the features of EB cured composites are discussed.Furthermore,the development of EB cured composites technology is summarized,which includes the selection of the resins...
Influence Analysis of Differential Corrections Transmitting Cycle on Positioning Precision
YANG Dong-kai, ZHANG Qi-shan
2000, 26(6): 633-635.
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The positioning error elements of GPS are described and the differential means are proposed in detail. The mathematics models of pseudo-range position and pseudo-range differential position are also introduced. The relationship between the corrected user pseudo-range residue and SA signal is analyze...
Performance Evaluation of Optical Burst-Mode Receiver Based on Peak-Detector in Adaptive Threshold Control Circuit
HUANG Jing-yu, LI Zheng, SU Guo-bin
2000, 26(6): 636-639.
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This paper purposes a theoretical analysis of the BER performance of burst-mode receiver. Considering two inherent factors, decay time constant and noise characteristic of the adaptive decision threshold, a comprehensive model to analyse the performance of burst-mode receiver is proposed. The theore...
SAR Bayesian SuperResolution Algorithm with a Correction of Perturbed Point Spread Function
WANG Guo-dong, ZHOU Yin-qing, LI Chun-sheng
2000, 26(6): 640-643.
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According to Bayesian formulation,an estimate-maximise (EM) algorithm of SAR super-resolution is presented for reconstructing radar cross sections from SAR images.The algorithm incorporates successfully the prior knowledge about the image scene into image reconstruction,which can effectively improve...
Radiation Performances of a Incline Rectangular Aperture Antenna
Lü Shan-wei, ZHANG Jiang-lin
2000, 26(6): 644-646.
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The incline rectangular aperture antenna is one whose opening is tapered only on both narrow sides of a rectangular waveguide, placed on a perfectly infinite conducting plane, excited by the dominant H10 mode in the rectangular waveguide. The electric and magnetic field components over the aperture ...
RCS of Metal Dielectric Joint on the Aircraft Cabin
JIANG Xin, NIU Bao-qiang, WANG Bao-fa
2000, 26(6): 647-649.
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An analysis is presented which of the diffraction due to a material discontinuity formed by the junction of a thick dielectric half-plane with a metallic one having the same thickness.This is accomplished by considering the solution of several subproblems, including the direct diffraction and the co...
Brown Motion Diffusion Model for Chaff Clouds
YANG Xue-bin, Lü Shan-wei
2000, 26(6): 650-652.
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The diffusion model and numerical simulation model for chaff clouds are modeled on the assumption that the speed of air where chaff locates is a Winner random process and the mass of chaff is zero so it can trace the atmosphere speed very well. For the diffusion model and numerical simulation model,...
Resonant Coriolis Massflow Meter
FAN Shang-chun, LIU Guang-jian, SONG Zhi-sheng
2000, 26(6): 653-655.
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The essential sensing mechanism was investigated for the resonant Coriolis direct massflow meter in detail.The mathematical model of the resonant direct massflow meter was established,based on a typical U-type tube resonant sensing structure.The output signal calculating model was provided for the a...
Design and Practice of Power Consumption Management for ZH2518 Portable Pressure Calibrator
FAN Shang-chun, WU Dong-sheng
2000, 26(6): 656-659.
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Design scheme and engineering practice project of power consumption were proposed for ZH2518 portable pressure calibrator, based on its actual operation. The minimum power consumption management was discussed from the device and system in operation scope, firstly. Second, The above management was in...
Theoretical Analysis on ElectroHydraulic Load Simulator
PEI Zhong-cai, WANG Zhan-lin, WANG Li-guo
2000, 26(6): 660-662.
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The thesis gives a thorough theoretical analysis on electro-hydraulic load simulator,builds up loading system mathematical model, shows all the factors which affect the performance of load simulator,analyzes the effects of structure parameters to the frequency characteristics of the loading system b...
Hybrid Method of Computer Aided FMECA and FTA
TAO Jian-feng, WANG Shao-ping, YAO Yi-ping
2000, 26(6): 663-665.
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Fault Tree Analysis (FTA) is an affective method from top to bottom, which can evaluate system reliability and safety. Failure Mode Effect and Criticality Analysis (FMECA) is a quantity reliability analysis from down to top. This paper combines the disadvantage between FTA and FMECA, finds the joint...
Application of Neural Networks in Differential Game
ZHOU Rui, LI Hui-feng
2000, 26(6): 666-668.
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The existing problems of application of differential game in practice are analyzed.Considering the processes of practical dynamic conflicts,neural networks combined with the theory of multilayer intelligence control are introduced to modeling the problem of differential game.It turns the problem of ...
Exploring the Means of Raising Pressure and Stable Range of ContraRotating Axial Compressor System
LI Qiu-shi, LU Ya-jun, YU Qing
2000, 26(6): 669-672.
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Through experiments on a contra-rotating fan, the performance base line and stall margin have been analyzed at varies rotate speed matching and varies axial gap between two rotors. Used global five-hole pressure probe, the steadyflow field between contra-rotating rotors has been also measured, and t...
Boundary Element Analysis of Temperature Field of Body
DING Li, YUAN Xiu-gan
2000, 26(6): 673-675.
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Due to intricacy of tissues and boundaries of body, it is very difficult to get a precise three-dimension temperature field about studied model of body. Boundary element methods was utilized to understand the meanings of equations of model effortlessly, to make calculation simply and to get a three-...
Experiment of Silver Interconnects of Photovoltaic Solar Array in IFM GroundBased AO Effect Simulation Facility
SHEN Zhi-gang, WANG Zhong-tao, ZHAO Xiao-hu, JIN Hai-wen
2000, 26(6): 676-679.
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Photovoltaic solar array systems are being considered as potential power sources for spacecraft applications. But the AO effect on silver solar cell interconnects would limit the useful life of the solar array. So the experiments were constructed to investigate the interaction between silver interco...
Euler Solution of a 3D WingBody Configuration with Aileron
LI Jin, ZHU Zi-qiang, WU Zong-cheng, CHEN Ze-min
2000, 26(6): 680-683.
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A Euler method for solving the flow around a wing-body configuration with deflection of control surface (aileron) is presented. Using the combination of patched grid and domain decomposition techniques, the complex flow around this kind of configuration is effectively solved. An internal coupling co...
Flow Visualization of Swept Wing/Body Junctions
ZHANG Hua, Lü Zhi-yong, YUAN Hui-jing
2000, 26(6): 684-687.
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Flow visualization test of swept wing/body junctions has been performed with laser light sheet technique and sodium-fluorescence dyed liquid method in the water channel of BUAA. The results show that in addition to Reynolds number, the angle of attack and the swept angle are also very important para...
Determination of the Effective Modulus of the Syntactic Foam Containing Hollow Spheres by Differential Scheme and MoriTanaka Method
YAN Han-bing
2000, 26(6): 688-690.
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On the basis of differential scheme and Mori-Tanaka method,two methods are developed to determine the effective modulus of composite reinforced by hollow spheres with changing contents and changing ratio of inside and outside radii.Then,Multi-step homogenization technique is adopted to determine the...
Research on Improved Crack Initiation Approach of Durability Analysis
LIU Wen-ting, LIU Tong
2000, 26(6): 691-693.
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There are three important shortages having influence on engineering application in crack initiation approach of durability analysis established.They are researched and improved in this paper.Durability test for a group of analogous specimens is carried out under service load spectrum of the structur...
Reliability Methods to Determine Fracture Toughness K1C and Fracture Threshold Value ΔKth
XIONG Jun-jiang, PENG Jun-hua, GAO Zhen-tong
2000, 26(6): 694-696.
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According to the randomization method of deterministic equation,fracture p-JR-Δa curve equation is established.From this fracture p-JR-Δa curve and fracture passivation curve,fracture critical value (J1C) p with the reliability level of p may be obtained.By means of fracture testing principle,fractu...
Inverse Simulation for Helicopter Maneuvering Flight
YANG Chao, XIONG Liang-yu, ZHANG Xiao-gu
2000, 26(6): 697-700.
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Inverse simulation and analysis of the representative maneuvering flight for the current helicopter are presented.The more sophisticated nonlinear model of flight dynamics,which include non-uniform inflow model,nonlinear aerodynamics of fuselage,rotor flap motion and forces coupling with the motion ...
Study on Local Buckling of Stitched Composite Laminates with an Elliptical Delamination
GUI Liang-jin, YE Ning, LI Zheng-neng, KOU Chang-he
2000, 26(6): 701-704.
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Delamination buckling of stitched laminates can cause high interlaminar stresses which, in turn, lead to delamination growth. This study presents a three-dimensional model to analysis local buckling of stitched composite laminates with an embedded elliptic delamination near the surface. The effects ...
Effective Wove Algorithm for Software Structure Graph
SUN Chang-ai, LIU Chao, JIN Mao-zhong
2000, 26(6): 705-709.
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Visualization of information is an important approach of understanding the structure of software and complex calls between modules of structural software hinder to analysis and understanding of software structure.A wove algorithm called generalized tensility balance algorithm, which is characterized...
Performance Analysis and Visualization for DSM-Based Parallel Programs
LONG Xiang, LI Wei
2000, 26(6): 710-713.
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According to the architecture of the shared memory based network of stations and the implementation of its memory coherence protocol,using experimental methodology to characterized the shared memory access,process schedule,and synchronize overhead. Several parameters which primarily affect the perfo...
Research about Non-Manifold Modeling System and It's Boolean Operation
ZHANG Xue-ming, SHI Fa-zhong
2000, 26(6): 714-717.
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At first, describes the basic principal of non-manifold geometric modeling , the data structure,and some basic operations of the system used,then describes the basic theory of Boolean operation in non-manifold geometric modeling which consists of extended EULER formula, set ownship classification fu...
Java SDAI Study and Implementation
CHEN Ji-bing, YANG Jun, ZHAO You-zhen, DENG Jia-ti
2000, 26(6): 718-721.
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For integrating product data on the Internet, the STEP SDAI(Standard Data Access Interface) based on Java language is implemented. This system includes these models: mapping of EXPRESS model to Java Language, application program interface according with SDAI session schema,and two converters, one is...
Robust Reduced-Order Controller Design Based on LMI
SUN Xiu-xia, MAO Jian-qin
2000, 26(6): 722-725.
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A non-convex problem has to be solved in the designing of reduced-order H∞ controller based on linear matrix inequality(LMI), which is so far an open problem. In this paper, a new method is presented to design reduced-order H∞ contrller with convex optimization. It guarantees H∞ performance, but som...
Research on FaultTolerant Control of Dynamically Redundant Manipulators
CHEN Wei-hai, WU Zhen, DING Xi-lun, ZHANG Qi-xian
2000, 26(6): 726-730.
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This paper is focused on the fault-tolerant control of dynamically redundant manipulators. Through optimizing the ellipsoidal sphere of joint torque, the dynamic fault-tolerant ability will be improved because the product of the principal axis length of the sphere can be increased. Based on this met...
Input Variable Description Method for Real-Time Software Test Case Auto-Generation
CHEN Xue-song, LU Min-yan, RUAN Lian
2000, 26(6): 731-734.
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In order to solve the problem of describing the input space for generating software reliability test cases automatically, the concept of promissory functions is presented. The input variables are classified according to their real time and valuing characteristics. The description of the valuing prop...

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