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2006 Vol. 32, No. 06

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Operational effectiveness analyses of air-to-ground strike for two-plane formation
Sun Kangwen, Huang Jun, Wu Zhe
2006, 32(06): 625-629.
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Two-plane formation is a main organization of the battle mode in the rivalry of air defense, which can fight the enemy’s strategic target more effectively. By using Markov random processes, a method of probability, which usually can be used in the evaluation of system’s effectiveness, the prediction...
Improved semi-analytical correlation approach for the flowfield downstream of swirl cups
Huang Yong, Guo Zhihui
2006, 32(06): 630-634.
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An improved semi-analytical correlation was proposed for the prediction of the flowfields downstream a typical swirl cup on the basis of previous correlations proposed by Rizk & Mongia. The improved correlation has clear physical definition and is adequate for its constants determination by larg...
Experimental analysis on oscillations of vortex breakdown location over delta wing
Zhang Minglu, Zhu Liguo
2006, 32(06): 635-638.
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Experiments of flow visualization and dynamic pressure measurement were carried out in a water channel and a wind tunnel respectively to research oscillations of the vortex breakdown location over delta wings. Based on statistics and spectral analysis location of vortex breakdown on video picture of...
Theoretical and experimental determination of DFR-corrosion-influence-factors
Bao Rui, Zhang Jianyu, Zheng Xiaoling, Fei Binjun
2006, 32(06): 639-644.
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The relationship of detail fatigue rating(DFR)-corrosion-influence-factors and aggressive environments was studied, which makes the DFR method under erosion environments for civil aircraft structures’ fatigue analysis more applicable to different structure details and different service environments....
Influence of empennage on flow over upswept after-body
Huang Tao, Wang Yankui, Deng Xueying, Zhan Huiling
2006, 32(06): 645-648.
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To provide a foundation of upswept after fuselage drag reduction, the flow patterns and aerodynamic characteristics over two upswept rear fuselages with and without empennages were investigated in a 1.5 by 1.5 meters low speed wind tunnel by the methods of oil flow, smoke wire/laser and force measur...
Dynamic design method of elastic ring squeeze film damper
Hong Jie, Deng Yin, Zhang Dayi
2006, 32(06): 649-653.
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A high efficient oil film damper which is known as elastic ring squeeze film damper (ERSFD) has special dynamical characteristics based on the conventional squeeze film damper (SFD). The characteristics of a gas turbine engine with ERSFD including the supporting stiffness of the elastic ring, the di...
Effect of ice accretion on aircraft flight performance
Zhang Qiang, Cao Yihua, Pan Xing, Jiang Chongwen
2006, 32(06): 654-657.
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An engineering method was presented to deal with the problems of aircraft flight performance affected by ice accretion. Based on the calculation method placing linear varying strength vortex panels on airfoil contour, ice accretion shapes on the leading edges of airfoils were predicted. While comput...
Effect of temperature ratio on the film cooling with the rotation
Yang Xiaojun, Tao Zhi, Ding Shuiting, Xu Guoqi
2006, 32(06): 658-661.
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A computional heat transfer(CHT) analysis was carried out to comprehend the mechanism of rotation and the temperature ratio of the film and the main flow on the film cooling which is important in understanding the mixing process between the film coolant and the hot stream air over the high pressure ...
Preparation of magnesium hydroxide flame retardant via MgCl2-NH3·H2O synthesis and hydrothermal modification treatment methods
Li Zhiqiang
2006, 32(06): 662-666.
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In order to solve the problem that the Mg(OH)2 is incompatible with the polymer, the two steps reaction of high dispersive Mg(OH)2 preparation, synthetic reaction and hydrothermal modification treatment, was studied. The effect of the synthetic reaction temperature, hydrothermal modification tempera...
Precision analysis of long distance navigation of rendezvous
Zhang Liyan, Qi Faren, Li Yili
2006, 32(06): 667-670.
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To get performance of attainable end point accuracy of long range navigation, error factors influencing precision were analyzed, and a precision analyzing method using simplified dynamical model together with quasi-mean element and covariance method was put forward, mathematical models of error prop...
Transient analytical method of vane forcing response under stator-rotor wake influence
Meng Yue, Li Lin, Li Qihan
2006, 32(06): 671-674.
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Rotor blade forcing response problems due to the wake of front vane row was analyzed. A transient analytical method was presented for blade forcing response. Then displacement and stress could be predicted. The analysis of three-dimension unsteady flow field was performed with NUMECA to provide the ...
Hopfield network based approach to aircraft design
Zhou Shengqiang, Xiang Jinwu
2006, 32(06): 675-679.
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Combining augmented lagrange multiplier(ALM) method to Hopfield neural network(HNN), was proposed to solve nonlinear constrained optimization. HNNis taken as a dynamic approach for minimization subproblem in ALM method, only needing the first derivative of the Lagrange function. The random neural ne...
Computation method improvement of military training plane effectiveness
Li Hanghang, Song Bifeng, Gao Hongjian
2006, 32(06): 680-683.
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The training effectiveness of military training plane is important to pilot cadets to master airmanship and to raise tactical level. Moreover, the quantitative evaluation of training effectiveness of training plane is the prerequisite to optimization of training system and evaluation of training syl...
Temperature compensation of pressure sensor based on the interpolation of splines
Fan Shangchun, Zhang Qiuli, Qin Jie
2006, 32(06): 684-686.
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The temperature compensation method based on the interpolation of cubic splines was presented. This method was applied for the temperature compensation of the experimental results of calibration of high precision resonant cylinder pressure sensors. The measuring range of the pressure sensor is 0.013...
Acquisition for BOC (1,1) signal in GALILEO receiver
Xing Zhaodong, Zhang Qishan, Yang Dongkai
2006, 32(06): 687-690.
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The zero values in BOC(1,1)(binary-offset-carrier) signal correlation function could make the receiver judge that the signal was not acquired. From the sub-carrier phase and code phase viewpoint, an acquisition method with three parallel tags was proposed to acquire the BOC(1,1) completely. The BOC(...
MOEMS accelerometer based on double Fabry-Perot interferometers and closed loop
Feng Lishuang, Liu Huilan, Lin Heng, Zhang Chunxi
2006, 32(06): 691-694.
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A micro-opto-electro-mechanical accelerometer based on differential double Fabry-Perot interferometers(DFPI) and closed loop was designed. The principle and the structure of the accelerometer were introduced. Inertial sensitive module was used to translate carrier’s acceleration measurement to its d...
Segmental training scheme for embedded hidden markov model
Xue Bindang, Xue Wenfang, Jiang Zhiguo
2006, 32(06): 695-699.
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A segmental scheme to retrain E-HMM(embedded hidden Markov models) for face recognition was presented. The current samples were assumed to be a subset of the whole training samples, after the training process, the E-HMM parameters and the necessary temporary parameters in the parameter re-estimating...
Novel vision system for large field inspection based on phase matching
Zhao Huijie, Ji Xiang
2006, 32(06): 700-703.
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To solve the problem of large scale three-dimensional (3D) measurement with high accuracy, a new binocular stereo vision inspection system was presented. By projecting variable period fringes, the surface with different curvature was coded with phase. The stereo matching points were determined using...
End-user specification for diagrammatic model languages
Xu Hongxia, Zhang Li
2006, 32(06): 704-708.
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Formal specification of diagrammatic languages is not applicable to end users because of the requisition of computer theory. In order to satisfy the requirement of end users to define their own domain-specific modeling language, a language named EUVDL(end-user visual definition language),was propose...
Multi-federation system based on tree-topology
Lin Xin, Wang Xingren
2006, 32(06): 709-712.
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The system logic structure has innumerous effect to the development, execution, and scalability of multi-federation system. A multi-federation system based on tree-topology structure was provided. Federations in the system were connected through proxies. Each federation was connected only with feder...
Experiment on influence of machining on transmission properties of frequency selective surfaces
, Wang Huanqing, Wu Zhe
2006, 32(06): 713-715.
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The machining technics affect the resonant frequency and transmission ratio of FSS (frequency selective surface). Effects on the transmission properties of FSS were explored by experiments to the machining method, surface conductivity and additional conductive coating under the same condition respec...
Finite volume method in thermal analysis of avionics
Fu Guicui, Wang Xiangfen, Jiang Tongmin
2006, 32(06): 716-720.
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The influence of heat to the system reliability was introduced. The merits and drawback of numerical methods in solving temperature distribution were compared. In order to solve the problem of avionics of high reliability which requires highly precise result and rapidly computational velocity in the...
Software encryption and just-in-time decryption for software protection
Liu Zhicheng, Zhou Bosheng
2006, 32(06): 721-724.
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Software protection via encryption is an effective way to prevent software pirate from understanding the program by means of reverse engineering. Traditional software protection method via encryption has obvious runtime overhead and start up delay because of its one-time decryption prior to executio...
Harden correction based on original projection sinogram for X-CT
Fu Jian, Lu Hongnian, Ren Huayou, Jin Hu
2006, 32(06): 725-728.
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The polychromatic spectrum leads to cup or streak beam hardening artifacts and reduces the image quality in X-CT (X-ray computed tomography). A correction method for beam hardening, involving simple operations of the original polychromatic projection sinogram, was presented based on the analysis of ...
Data communication protocol based on dual CAN bus for digital servo drive
Liu Yanqiang, Huan Ji
2006, 32(06): 729-733.
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The communication performance of advanced field bus protocols used in NC systems was analysed, and a new data communication protocol was defined based on dual CAN(controller area network) for position control system in NC—CANsmc(CAN for synchronous motion control). CANsmc, defined as a master/slave ...
Construction of case-based knowledge base for aircraft sheet metal forming
Chen Qingxin, Li Xinjun, Wan Min
2006, 32(06): 734-737.
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To promote further technological innovation for aeronautic industry and improve the conventional aircraft sheet metal forming process with information technology, a system of case-based knowledge base for aircraft sheet metal forming was developed by using Oracle database management system and Visua...
Cleaning robot design for cone high-rise glass-curtain wall
Wang Wei, Tang Boyan
2006, 32(06): 738-741.
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To fulfill the demand for the lightness, high reliability and safety, three structure design principles were proposed for a cone high-rise glass-curtain wall cleaning robot. The whole cleaning robot structure was designed based on the principles which were described as the motion driver dispersed co...
Numerical method for Lyapunov exponents of multibody systems with constraints
Fu Shihui, Wang Qi
2006, 32(06): 742-746.
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Dynamic equations of multibody systems with constraints induced by the first kind of Lagrange’s equations are nonlinear differential-algebraic equations. To be solved numerically, nonlinear differential-algebraic equations were transformed into ordinary differential equations with the augmentation a...
Clustering algorithm based on kernel methods and its application
Ji Qiuying, Lin Jian
2006, 32(06): 747-750.
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Based on the analysis of the core concepts of the kernel methods, a clustering algorithm based on kernel methods was put forward. In general, traditional clustering algorithms are suitable to implement clustering only if the feature differences of data are large. If the feature differences are small...

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