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2004 Vol. 30, No. 12

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Equivalent time-variable availability analysis based on individual sub fault tree
Wang Shaoping, Tao Jianfeng, Cui Mingshan, Jiao Zongxia
2004, 30(12): 1137-1141.
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With depth-first left-most ergonic algorithm, the complex dynamic fault tree can be decomposed into several ISFT (individual sub fault tree) in availability analysis of complex system. In order to calculate its availability in time-variable filed, the equivalent time-variable availability parameters...
Application of hybrid genetic algorithm in aeroelastic multidisciplinary optimization
Wan Zhiqiang, Yang Chao, Li Zhengneng
2004, 30(12): 1142-1146.
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The genetic/sensitivity-based hybrid algorithm was used for the design studies of aeroelastic tailoring of a forward-swept composite airplane. The design objective is to minimize the weight of skin. The ply-thicknesses of wing skin were selected as design variables. The constraints were strength, di...
Realization method of moving target detection based on along-track interferometry
Sun Na, Zhou Yinqing, Li Jingwen
2004, 30(12): 1147-1150.
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An algorithm of moving target detection, radial velocity estimation and relocation based on ATI(along-track interferometry) with dual-aperture antenna was proposed. Compared with DPCA (displaced phase center antenna) technique, this method need not satisfy the strict constraint between platform velo...
Fuzzy control of aircraft environmental control system
He Jun, Zhao Jingquan, Yuan Xiugan
2004, 30(12): 1151-1154.
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Ground-tests proved that aircraft ECS(environmental control system) with conventional PID(proportional-integral-differential) controlling means could not refrigerate the electronic equipment and cabin satisfactorily. A new fuzzy control model is proposed which consists of some membership functions e...
Numerical simulation on gas dynamic resonance heating effect
Tong Xiaoyan, Liang Guozhu, Zhang Guozhou, An Lian
2004, 30(12): 1155-1158.
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To study the interior flow of the resonance tube, the model of the nozzle-cylindrical resonance tube system was established, and the gas dynamic resonance heating effect was simulated. The explicit second-order NND scheme was used to solve the 2-D axisymmetric Reynolds averaged N-S equations. The he...
Method of updating LBTS passively for HLA time management
Hu Yahai, Xu Yongbo, Peng Xiaoyuan
2004, 30(12): 1159-1162.
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The LBTS (lower bound time stamp) quarry is key problem for TM (time management) performance. An optimized method will be proposed for improve the TM performance in HLA(high level architecture). It can reduce the frequency of LBTS transfer, and time-constrained federates will be notified LBTS only w...
Theoretical study on lightweight design of thin-walled beam structure for automobile body
Sun Lingyu, Yao Yingxian
2004, 30(12): 1163-1167.
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The main load-supporting elements for an automobile framework are thin-walled beams. To study the effectiveness of lightweighting on the body stiffness, the analytical formulae describing static bending and torsional stiffness of a beam with fixed-fixed supporters were derived firstly. To get a ligh...
Study on iterative availability algorithm of Markov renewal equation
Wang Shaoping, Tao Jianfeng, Cui Mingshan, Jiao Zongxia
2004, 30(12): 1168-1172.
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Dynamic structure variance of cool spare system requires the dynamic availability analysis with transient solution. The traditional calculation method of Markov renewal equation based on Laplace transform and inverse Laplace transform makes many difficulties to complex system. The iterative availabi...
Modified Woodward synthesis method and application to design the feed of large aperture antennas
Han Yanju, Lü Shanwei, Wang Jie, Nan Rendong
2004, 30(12): 1173-1177.
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A new method of antenna directional pattern synthesis using least-squares or pseudoinverses is presented here ,which is based on the analysis of traditional Woodward-Lawson synthesis method and other modified methods. This new method combined with array beamforming technology is used to design the e...
Analysis of data compression algorithm and its improvement in ATN
Yang Chenglei, Zhang Jun, Liu Feng
2004, 30(12): 1178-1181.
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To solve the data compression problem and improve the transmission efficiency in the ATN(aeronautical telecommunication network) mobile communication network, the data packets headers compression algorithm of CLNP(connectionless network layer protocol) is discussed in detail. The relationships of tr...
Multi-fractal and its application in terrain character analysis
Cao Hanqiang, Zhu Guangxi, Li Xutao, Xia Wenfang
2004, 30(12): 1182-1185.
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The multi-fractal spectrum of natural surfaces was computed and analyzed with the multi-fractal method. The parameters of multi-fractal spectrum were used to describe hierarchically refined structure of terrain and pop out the singularity characters of local area. Thus, the exact characterization of...
Gravity balance technique installed on six-freedom spacecraft docking test table
Zhang Guangyu, Zhang Chongjun, Zhao Xuezeng
2004, 30(12): 1186-1190.
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To balance gravity, a balance set with high respond speed and precision was designed. The set adaptable to high and low temperature was installed in the inside of the docking mechanism. Relative techniques are introduced, such as spherical gemel hoisting mechanism that made the active docking ring r...
Research of missile random maneuver strategy
Yang Youchao, Jiang Yuxian
2004, 30(12): 1191-1194.
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A kind of random maneuver penetration strategy with unknown maneuver law is studied. The randomicity of the maneuver can ensure the missile's high penetration probability. In analyzing the model of interception-penetration, linearplanar relative movement equation was used. Using the adjoint system m...
Distributed part parametric design system based on COM/DCOM
Li Bo, Wang Rongqiao
2004, 30(12): 1195-1199.
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To implement the distributed part design based on UG(Unigraphics), two application development modes of UG were compared, and a universal parametric design method on the basis of a part library was presented. Through UG external programming, and utilizing COM (component object model), a universal so...
Fatigue damage accumulation model based on stiffness degradation
Qi Hongyu, Wen Weidong, Sun Lianwen
2004, 30(12): 1200-1203.
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Damage of composite materials is very complex under static and fatigue loads. It is important for mechanical behavior to model the damage of composite materials. To simulate fatigue damage and predicate the fatigue life of composite material, a new fatigue model is given according to the strain equi...
JCVM resolving optimization design and implementation
Chang Qing, Jin Wei, Li Chunlong, Zhang Qishan
2004, 30(12): 1204-1207.
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To solve complex resolving and slow runtime problems of traditional JCVM(Java card virtual machine), the separate resolving solution was proposed according to the special structure of off-card and on-card JCVM. The static resolving out of card and the dynamic resolving within card was discussed, and...
Novel method of image compression based on associative memory system
Li Yundong, Zhang Qishan
2004, 30(12): 1208-1211.
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To study the traditional neural networks which were featured as slow convergence and poor generalized capacity in image compression, a novel method of image compression based on associative-memory-system neural network was proposed. Associative memory system was constructed by newton's forward inter...
Research on integrated penetration of the anti-ship missile
Wu Qiang, Jiang Yuxian
2004, 30(12): 1212-1215.
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The integrated defence system for the important targets on the sea is composed of multilayer interceptors and soft defence means. In order to attack the targets effectively, the antiship missile must get through the integrated defence system safely. Corresponding penetration maneuver is adopted acco...
Research of accelerated corrosion test method of zinc, cadmium plating on high-strength steel
Liu Huicong, Zhu Liqun, Du Yanbin
2004, 30(12): 1216-1220.
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Using three accelerated corrosion tests in the lab, the relativity of accelerated corrosion in the lab and Xiamen marine atmosphere corrosion was studied to the zinc and cadmium plating coatings on the high-strength steel. The three methods selected are the accelerated salt spray test, orthogonal di...
Numerical simulation of separation flow around flaps with varied gap size
Chen Yingchun, Zhang Panfeng, Wang Jinjun
2004, 30(12): 1221-1224.
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The flow around the plate flaps with base vent was studied by numerical simulation. The Reynolds averaged Navier-Stokes equations were solved by SIMPLE method combined with two-layer zonal boundary layer model. The flow structure depends on the interaction of the separated shear layer from the up ed...
Research on domain analysis and modeling
Zhang Wen, Huai Jinpeng
2004, 30(12): 1225-1230.
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Based on the communication system model in the Information Theory, a three-dimensional domain concept model is proposed to depict domain exactly. Thefirst dimension is information encoding format; the second one is action of information operation; the third one is atomic goal of information system. ...

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