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2001 Vol. 27, No. 5

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Electrochemical Investigation of Cerium Conversion Coatings Deposited on Porous Film of Anodized Aluminum
LI Guo-qiang, LI Di, GUO Bao-lan, PENG Ming-xia
2001, 27(5): 495-498.
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Cerium-rich conversion coatings was deposited on porous film of anodized aluminum by cathodic electrolysis in a solution containing 1g/L CeCl3·7H2O and 2.7g/L H2O2. Electrochemical and chemical reactions related with coating formation were studied using electrochemical methods such as cyclic voltamm...
A Wide-Band Monopulse Antenna-Feed System
LIU Juan, Lü Shan-wei
2001, 27(5): 499-502.
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A wide-band monopulse antenna-feed system was developed by the authors. This wide-band monopulse antenna-feed system operates in S~C bands．Its key parts include the taper slot antenna, the wide band magic T and the wide band divider. By analyzing and calculating taper slot antenna and the factor of ...
Visualization Computing of Radar Objects in Resonance Region of RCS
JIANG Xin, YANG Zhi-ling, WANG Bao-fa
2001, 27(5): 503-506.
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Abstract:
With the development of visualization in scientific computing, traditional MOM for low frequency RCS has been re-evaluated. By means of advanced 3Dmodeling technology, a loop circuit method for solving the scattering field of 3Dtargets in resonance region is presented. The numerical results are in g...
Traveling Wave Computation of Low-Scattering Cabin
ZENG Zhi-yong, NING Huan-sheng, WANG Bao-fa
2001, 27(5): 507-510.
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Graphical electromagnetic computing (GRECO) is recognized as one of the most valuable methods of RCS computation in high-frequency region. For the low RCS cabin, the effect of traveling wave is remarkable and larger than that of facets and wedges in some cases. A practical example of Low-RCS target ...
Design and Implementation of ACARS Message Communication Server
ZHONG Qing, ZHANG Qi
2001, 27(5): 511-513.
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Client/Server model was applied to the design and implementation of ACARS message communication server. In order to improve the system performance of real-time and rapid response, a multithread technique was used. The multithread concurrent server can receive, send and distribute ACARS messages in r...
On the Slot Reservation Selection Algorithm aboutSelf-Organized TDMA VHF Data Link
ZHANG Jun, ZHANG Qi-shan, DENG Qiu-lin
2001, 27(5): 514-517.
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Slot reservation selection algorithm is the key to the dynamic slot reservation in Self-organized TDMA data link. The effect of the slot reservation selection algorithm on the performance of S-TDMA VHF data link was analyzed with probability analysis method, especially in the case when users' slot s...
Relationship Between Satellite Attitude Jitter and SAR Imaging Quality
CHEN Jie, ZHOU Yin-qing, LI Chun-sheng, CHEN Yuan-zao
2001, 27(5): 518-521.
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To provide a theoretical foundation for the design and analysis of spaceborne SAR, a method quantitatively analyzing the relationship between attitude distortion and spaceborne SAR imaging quality was developed, based on a mathematical model describing satellite attitude jitter and an expression of ...
Temperature Calibration in A Distributed Temperature Sensor System Based on Raman Back-Scattering
A Distributed, CHANG Cheng, LI Zheng
2001, 27(5): 522-524.
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Temperature calibration in a distributed optical fiber temperature sensor system based on Raman back-scattering was discussed. A very useful principle was presented on the basis of considering system stability and system temperature sensing accuracy. By measuring and studying the loss due to status ...
A System on Speckle Reduction and Quality Evaluation of Spaceborne SAR Images in IDL
YAN Ying, ZHOU Yin-qing, LI Chun-sheng, CHEN Jie
2001, 27(5): 525-528.
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Speckle reduction techniques and quality evaluation for one-look spaceborne synthetic aperture radar(SAR) images were integrated into one system in IDL language, which provides a complete computational environment for visualization and mathematical analysis of scientific data. With this system, high...
Analysis of Multi-Groove Circular Radiators　with Moment Method
Lü Shan-wei, GAO Wen-jun
2001, 27(5): 529-531.
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The method of moments was employed, in conjunction with the equivalent-source technique and the modal expansion theory, to analyze multi-groove and multi-mode circular radiators. No restriction was imposed on the number, width and depth of grooves, so the theoretical method and the analytical formul...
Identification of Frequency Domain Maximum Likelihood System Using Genetic Algorithm
DUAN Shi-zhong, ZHOU Yin-qing
2001, 27(5): 532-535.
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Float point genetic algorithms were used to solve the start value and convergence problems of frequency domain maximum likelihood system identification, based on errors-in-variables model. Simulations showed that it is difficult to get accurate result only using the genetic algorithm, while the trad...
On Reliability Model of SCI Interconnections in Avionics System
SCI Interconnections, ZHOU Qiang, LUO Zhi-qiang, LI Qiao
2001, 27(5): 536-539.
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The problem of reliability modeling of Scalable Coherent Interface(SCI) protocol, the candidate standard for the future avionics system, is studied. Based on basic SCI interconnection model, a task-based analysis method of system reliability is proposed. A reliability model of SCI interconnection sy...
Common Waveform Series
ZHANG Qi-shan, YAN Guang-wen, WEI Yu-chuan
2001, 27(5): 540-543.
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In addition to sine functions, sawtooth, square, triangular and trapezoidal wave all are common waveforms in electronics as well. With the help of a formula in number theory, the relations between common waveforms and sine-cosine functions are presented, and the classic Fourier series is generalized...
A Virtual Instrument System Based on Parameter IdentificationDeveloped to Test Permanent Magnet DC Motor
LIU Xiang-qun, WEI Zhen-zhong, ZHANG Ren, QIU Yue
2001, 27(5): 544-547.
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Parameter estimation method (based on block pulse function and least square method) applicable to virtual test system of a permanent-magnet DC motor was discussed. Electromechanical parameters of the motor was obtained through parameter estimation. Physical parameters, dynamic and static characteris...
Optimal Control of Systems with Random Changing Structures
WU Sen-tang
2001, 27(5): 548-551.
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An approach is given to get optimal control of systems with random changing structures.Without the indicator of structures conversion, the solution is obtained to solve control problems of systems with random changing structures when system structures conversion process is difficult or unable to obs...
Decentralized Variable-Structure Control of a Class of LinearUncertain Large-Scale Systems
ZHAO Chao, SHEN Gong-zhang, WEN Chuan-yuan
2001, 27(5): 552-555.
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The paper proposes a new variable-structure control scheme for a class of linear uncertain large-scale systems with parameter perturbations, interconnections and external disturbances. The chatting and limited control problems are discussed, and proper solving methods are formulated. The proposed co...
Application of Simulated Annealing to Global Optimization Problems with Continuous Variables
JIANG Jia-he, SONG Zi-shan, SHEN Wei-qun, QIU Li-wei
2001, 27(5): 556-559.
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Global optimization problems with continuous variables were discussed based on simulated annealing. Implementation steps were given. Practical methods of determining control parameters were introduced. According to characteristics of continuous variables, practical methods of generating new points f...
A Combined Method of High Precision Temperature Control
SONG Ming-gang, FAN Shang-chun
2001, 27(5): 560-563.
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Abstract:
A combined method of high precision temperature control and its application in a constant temperature trough were presented. Combining Fuzzy logic with intelligent PID control of expert type, the method fully utilizes the expert's experience of manual manipulating and quantitative operating feature ...
Applications of Artificial Neural Network to Opto Electric Measurements
ZHANG Guang
2001, 27(5): 564-568.
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Artificial neural network technology is getting wider and wider scale application. Following a brief introduction on neural network, its recent applications to optoelectric measurements were described in detail, including online monitoring grain protein based on NIR, structured light based 3D vision...
Experimental Study on Film Cooling at Rotating Flat Blade Tip
WU Hong-wei, DING Shui-ting, CAO Yu-zhang, TAO Zhi
2001, 27(5): 569-572.
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The governing conservation equations were non-dimensionalized according to the theory of similarity, a series of analogous criteria were obtained to study rotating film cooling. The rotating components of film cooling were designed and set up. A series of problems, such as signal transfer between ro...
Control of the Reliability of Mechanism and Relevant Breakdown Caused by the Malfunction of Coupling
SHEN Guo-shan, LIU Wen
2001, 27(5): 573-577.
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Abstract:
To enhance the integral machinery reliability of the mechanical system by means of minimizing mechanical movement clog and controlling correlation failure, some relevant investigations were carried out on failure mode, failure mechanism and scathe analysis. It was found that the main cause of all th...
Failure-Rate Analysis of Repairable Systems
SUN Jin-kang, LI Zheng-neng
2001, 27(5): 578-581.
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Considering the influence of maintenance on reliability, an approach about the modeling of failure processes for repairable systems was presented, which includes the definition and formulation of failure rate. Interrelations between these rates and failure intensities, such as inherent hazard rate a...
MATLAB Simulation Model of Air-to-Air Plate-Fin Heat Exchanger
SONG Jun-xiao, YUAN Xiu-gan
2001, 27(5): 582-584.
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A dynamic lumped model of air-to-air heat exchanger is established and constructed in MATLAB environment. The model can deal with dry air condition and moisture condition with the same lumped parameter method. Simulation results of some ECS indicate that the present model has great potential in the ...
Simulation of Stationary Random Process with MATLAB
PENG Jing, JIN Chang-jiang
2001, 27(5): 585-588.
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The basic definitions of stationary random process and the principles of using spectrum decomposing to simulate the stationary random process were given. The three important factors to be considered when simulating stationary random process with MATLAB including selection of signal source, simulatin...
Fuzzy Neuron and Its Computational Capability
LIANG Jiu-zhen, HE Xin-gui
2001, 27(5): 589-592.
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Based on analysis of the limitations of computational capability of a fuzzy neuron model, two improved methods on the definition of fuzzy neuron model are presented, by using non-monotonous function as restricted inspiring function and by modifying the definition domain. For the improved fuzzy neuro...
Implementation of Dynamic ReportCreation Based on Developer/2000
LI Qing, ZOU Jie-tao, LI Zhi
2001, 27(5): 593-595.
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Output reports of database application system are usually designed in the developing process, which limits the change of use-s management requirements. This paper presents an implementation method of optional query and creating reports while the system runs based on Oracle development tool Developer...
On the Free Vibration of High-Speed Ball Bearing Retainer
ZHOU Yan-ze, WANG Chun-jie, LU Zhen
2001, 27(5): 596-599.
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As a basic component of mainshaft ball bearing in aero-engine, retainer vibration plays an important role in the strength and stability of the retainer and the bearing performance. With finite element method, the free vibration performance of the retainer is examined. The results show that: 1)Apart ...
Four-Test-Winding Eddy Current Sensor for Seam Tracking and Its Application
WU Hong-jie, QI Bo-jin, WU Xin
2001, 27(5): 600-603.
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A four-test-winding eddy current sensor for seam tracking was introduced to improve the accuracy of automatic seam tracking system for sheet butt joint. Both horizontal and vertical deviation information can be gained from testing the eddy current induced by the excitation winding. In addition to ad...
Analysis of Kinematics of Three-Branch Space Robot
REN Jing-yi, SUN Han-xu
2001, 27(5): 604-607.
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The kinematics of a three-branch space robot mechanism was analyzed by presenting its model and discussing its three working modes. The space robot is a kind of serial-parallel mechanism when it is working in carrying and cooperating modes. Since six out of its twelve joints are independent in this ...
Application of Micro Input-Output Theory to Enterprises' Logistics System
ZHENG Yun, WEI Fa, JIANG Xing
2001, 27(5): 608-610.
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Based on the structure and the character of enterprises' logistics system, application of dynamic and stochastic production function which describes the input-output relation of an enterprise to logistics scheduling was discussed. The type, quantity, time and space of a flow of produce nodes can be ...
Experiment Data Acquisition System of Low Power Arcjet Thruster
TANG Hai-bin, JI Luo-shuan, LIU Yu, DAI Wu-ye
2001, 27(5): 615-618.
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With an introduction to the experimental setting and the data acquisition system of low power Arcjet thruster, measuring principles of engine operating thrust, current and voltage were highlighted, together with descriptions about measuring methods of parameters, hardware configuration, and performa...

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