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2004 Vol. 30, No. 09

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UML-based analysis method for collaborative intrusion detection system
Qian Depei, Zhang Ran, Bai Yuebin
2004, 30(09): 803-807.
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Abstract:
To enhance the capability of detecting distributed attacks, a general model of distributed collaborative intrusion detection was proposed, which is based on multi-agent. It achieves detection of complex attacks through coordinating the lower-level agents using coordination agents. Unified modeling l...
Model analysis of bladed disk coupled system of compressor with low aspect ratio
Zhang Dayi, Shi Yajie, Lin Li, Hong Jie
2004, 30(09): 808-812.
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To study the blade vibration in coupled impellers system, a finite element model in the base sector for a coupled impellers system with low aspect ratio in a compressor was created. A vibration analysis for the coupled system by wave transmittal technique was processed, thus computed the coupled vib...
Reliability analysis based on simulation modular to control system
Wang Shaoping, Tao Jianfeng, Jiao Zongxia
2004, 30(09): 813-817.
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Abstract:
An object-oriented method of computer aided failure mode and effect analysis (CFMEA) was presented. The simulation modular of control system was established, in which the data, performance and mapping relation were encapsulated in component model and typical control modular. Through causal reasoning...
Investigation of testing dynamic characteristics of digital closed-loop fiber optic gyroscope
Wang Yan, Zhang Chunxi
2004, 30(09): 818-821.
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Abstract:
The fiber optic gyroscope is a new rotation sensor, and it is based on the Sagnac effect. The bandwidth of fiber optic gyroscopes is wider than mechanical gyroscopes. It is difficult to test dynamic characteristics of fiber optic gyroscopes with traditional equipment. Considered the principle of dig...
Electromagnetic characteristics of different shape ZnO composite
Liu Jianhua, Sun Jie, Li Songmei, Chen Dongmei
2004, 30(09): 822-825.
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Tetrapod-shaped ZnO whiskers (T-ZnO) with the structure of hexagonal cross sections were prepared by using the control method of carbon-reducing agent. The spherical-shaped ZnO nanocrystals were synthesized by using stearic acidsol-gel combustion technique. The dielectric constants and magnetic cons...
High resolution spaceborne SAR implementation method based on multiple phase centres antenna
Liang Weibin, Li Chunsheng, Zhou Yinqing
2004, 30(09): 826-830.
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Abstract:
An implementation method of high resolution spaceborne SAR based on multiple phase centres(MPC) antenna was studied, especially to the tri-phase centers antenna, as can effectively resolve the impact of resolution and swath extension. The echo signal model was proposed, and a method of processing th...
Numerical study on hydrazine arcjet thruster working exchangeability
Xiao Yingchao, Tang Haibin, Liu Yu
2004, 30(09): 831-834.
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Abstract:

A simplified physical model of an arcjet thruster was established on the basis of proper understanding of the physical mechanism of its working course, and a mathematical model for it was expressed by using Navier-Stokes equations coupled with electromagnetic source terms based upon the physical mod...
Study on an XML approximately duplicated data cleaning method
Chen Wei, Ding Qiulin
2004, 30(09): 835-838.
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Aiming at the importance of semi-structured data XML in data cleaning, how to clean XML approximately duplicated data was studied. An efficient XML approximately duplicated data cleaning method was proposed. This method is adaptive, because any other approximately detecting algorithm can be used in ...
Ambiguity performance analysis of spaceborne SAR with thermal mechanism errors in phased array antenna
Chen Jie, Zhou Yinqing
2004, 30(09): 839-843.
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Abstract:
To analyze the ambiguity performance of spaceborne synthetic aperture radar (SAR) with onboard thermal mechanism errors in phased array antenna, a mathematical model for thermal mechanism errors was established, based on the characteristics of spaceborne SAR antenna. The formula of the antenna patte...
Error analysis based on hierarchical availability analysis
Wang Shaoping, Tao Jianfeng, Jiao Zongxia
2004, 30(09): 844-849.
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Abstract:
With the hierarchical decomposition technology, the dynamic fault tree of complex system can be simplified into individual modular, which assumes that there is no intrinsic relation with other modulars. The equivalent time-variable availability parameters of individual modular such as equivalent fai...
Error analysis of a computer-assisted orthopedic system for distal locking of intramedullary nail
Liu Wenyong, Wang Manyi, Wang Tianmiao, Hu Lei
2004, 30(09): 850-854.
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Abstract:
To solve the distal locking difficulty arising from the bending and twisting of the intramedullary nail axis while the nail implanting in long bone fracture therapy, an image-guided computer-assisted orthopaedic surgery system was introduced. To evaluate the error distribution of the system, a speci...
Optimal design of composite sandwich structure
Xiu Yingshu, Cui Degang
2004, 30(09): 855-858.
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Abstract:
The aeroelastic property of a wing can be improved by using the bending-twisting coupling effect of composite material skin. A genetic algorithm approach was employed to optimize this type structure in order to maximize the effect of bending twisting coupling and a sandwich structure to be an analys...
RLS de-spread re-spread multitarget array algorithm for MC-CDMA
Wang Huimin, Lü Shanwei, Su Donglin, Han Yanju
2004, 30(09): 859-862.
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Abstract:
Multi-carrier code division multiple access(MC-CDMA) is a hybrid of orthogonal frequency division multiplexing(OFDM)and code division multiple access(CDMA).To resist co-interference of MC-CDMA system,smart antenna are used in MC-CDMA. A blind adaptive array algorithm was developed for MC-CDMA system...
Numerical calculation of stretch bending of narrow strip and analysis on spring back
Du Song, Anatoly, Chumadin
2004, 30(09): 863-867.
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Abstract:
To analyse stretch bending of narrow strip by numerical calculation, taking the loading history into account, the deformed zone was divided intomany elements to determine their strain by the condition that constant volume remains in deformation. Increment strain theory was applied to calculating the...
Research on fault diagnosis and running with fault method in dynamic system based on PLC
Gao Shumin, Fei Yuhua
2004, 30(09): 868-871.
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Abstract:
The fundamental and means of realization of fault diagnosis was introduced, which can be applied in the dynamic system controlled by PLC controller. In order to improve the reliability of the control system, one method that is realized by programming the ladder diagram to make use of the output modu...
Design and realization of GPS/GLONASS positioning emulator
Song Changfeng, Teng Jitao, Wang Y, ong
2004, 30(09): 872-875.
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Abstract:
GPS(global positioning system) and GLONASS(global navigation satellite system) which are two kinds of real time satellite positioning systems are applied widely. In order to fit the needs of offline experiment, a GPS/GLONASS positioning emulator that based on the theory of satellite navigation was d...
Body fitted method with cartesian coordinates for solving viscous fluid flow and heat transfer problems
Kang Ning, Wang Jianbing
2004, 30(09): 876-881.
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Abstract:
A body fitted unstructured numerical method which takes advantage of Cartesian coordinates and reserves irregular control volumes near boundaries was studied for solving incompressible viscous fluid flow and heat transfer problems. The conservation equations were solved in the cells that are interse...
Temperature prediction and simulation model of satellite’s thermal balance test
Li Yunze, Wang Jun
2004, 30(09): 882-884.
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Abstract:
To predicate the equilibrium temperature and simulate the heat variation influence of satellite thermal balance test more easily and correctly, a double layer lumped parameter model of the satellite equipment temperature was set up. The dynamic model had a simple nesting structure, its parameters ca...
3D numerical analysis for the effect between tip clearance and casing treatment in turbomachinery
Yuan Wei, Zhou Sheng, Lu Yajun
2004, 30(09): 885-888.
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Abstract:
The field in tip clearance of some compressor stator was simulated by Numeca CFD, as well the field in casing treatment slots. The results were compared and analyzed, the computation showed detail streamline in tip clearance and slots. By the casing treatment, the flow path was changed, the tip leak...
Human-imitating control based on chaotic neural networks
Shi Xiaorong, Zhang Minglian
2004, 30(09): 889-892.
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Abstract:
A control method was proposed, which combines the human-imitating control theory and the optimization capability of chaotic neural networks (CNN). Firstly, a qualitative control law(linear or nonlinear control law)was formed according to human-imitating control. Then, the qualitative control law was...
Research of task assignment in aircraft utility management system
Ma Baohai, Qiu Lihua
2004, 30(09): 893-896.
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Abstract:
The airborne utility management system is the inevitable developing trend of airborne system. The tasks of the airborne utility management system were partitioned for solving the task assignment problem. The two-level tasks allocation strategy of cycle tasks and un-cycle tasks was put forward becaus...
Three-parameter Weibull process of using position element and point estimation
Xiao Lianghua, Zhao Yu, Huang Min
2004, 30(09): 897-900.
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Abstract:
In the Weibull process, the peril rate is zero or infinite when time equals zero. In order to solve this problem of fitting in the engineering, the position element was put forward to revise the Weibull process. Iterative fitting, correlation coefficients method and maximum likelihood method were in...
Modeling, equilibrium and stability for double balloon system with tether and net
Du Liang, Hong Guanxin
2004, 30(09): 901-904.
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To study the design problem and evaluate the resisting wind ability for a double balloon system with tether and net, the mathematical model of the system was established consider of the effect of wind, it includes the balloon’s mathematical model in the body-coordinate system, tether’s mathematical ...
Center of gravity estimation in an object oriented aircraft conceptual design system
Liu Hu, Lu Xinlai, Wang Liang, Wu Zhe
2004, 30(09): 905-908.
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Abstract:
In order to evaluate such characteristics as weight and static stability of proposed concepts effectively and conveniently during aircraft conceptual design, the implementation of center of gravity and associated weight estimation in an computer aided aircraft conceptual design system, whose data or...
Research on airborne power-by-wire integrated electrical actuation and control systems
Sha Nansheng, Li Jun
2004, 30(09): 909-912.
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Abstract:
The development of airborne integrated electrical actuation systems in the latest ten years and main results were summed up. It concluded the virtues of integrated electrically actuation system. The successful airborne electrical actuators consist of electro-hydrostatic actuator and electro-mechanic...

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