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2006 Vol. 32, No. 12

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Numerical study of aeroheating predictions for hypersonic reentry bodies
Kang Honglin, Yan Chao, Li Tinghe, Guo Dilong
2006, 32(12): 1395-1398.
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In order to calculate the heating rates on hypersonic blunt bodies quickly and effectively, two engineering methods were developed based upon the axisymmetric analogue which required tracking the inviscid surface streamlines. Engineering predictions in the boundary layer were used in both methods. H...
Calculation method of critical radar cross section of low pulse repetition frequency PD radar
Ma Dongli, Ma Tielin, Liu Weiwei
2006, 32(12): 1399-1402.
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The aerodynamic characteristic of UAV(unmanned air vehicle) was studied based on the method of combining aerodynamic prediction with wind tunnel test. The contrast tests of longitudinal moment for different anhedral and incidence of V-tails were conducted to confirm the empennage distribution and to...
Study of aeroelastic tailoring of high-aspect-ratio flexible composite wing
Liu Xiangning, Xiang Jinwu
2006, 32(12): 1403-1407.
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The nonlinear government equations of the flutter problem of high-aspect-ratio flexible composite wing were derived from the most general aeroelasticequations with wing′s structure geometrical and aerodynamic nonlinearity being considered. Then the gradients of flutter speed and frequency of wing wi...
Simulation experimental technique and primary study of Reynolds number effect on vortex asymmetry at forebody
Bo Nan, Deng Xueying, Wang Yankui
2006, 32(12): 1408-1412.
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An experimental study with pressure measurement at low speed subcritical and critical Reynolds number range has been carried out for both slender body models with fineness ratios of 6.15 and 11. The results show that if the end of afterbody is far enough from the twin asymmetric vortices region, the...
RCS study of moving radar targets
Su Donglin, Zeng Guoqi, Liu Yan, Wang Guoyu
2006, 32(12): 1413-1417.
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Obtaining the angles between the moving target and the radar is very important in the study of radar cross section(RCS) of moving targets. The angles between the moving target and the radar were defined and calculated in detail. The differences and relationship of angles from static targets and movi...
Accurate method to calculate space-borne SAR Doppler parameters
Wen Zhu, Zhou Yinqing, Chen Jie
2006, 32(12): 1418-1421.
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A new method which can calculate the whole swath Doppler parameters of space-borne SAR(synthetic aperture radar) was presented. The method, based on space coordinate transformation, made the satellite position and velocity as references. Using the space geometric model and the coordinate transformat...
Dynamic source routing algorithm for LEO satellite networks
Song Xuegui, Liu Kai, Zhang Jun, Cheng Lianzhen
2006, 32(12): 1422-1426.
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Based on the regular and predictable features of topology changes in low earth orbit (LEO) satellite networks, a dynamic source routing algorithm, namely adaptive route-selection (ARS) algorithm, was presented for LEO satellite networks. In the algorithm, logical location is adopted to hide satellit...
Influence of slot width on transmission properties of frequency selective surfaces
Wang Huanqing, Lü Mingyun, Meng Zhijun, Wu Zhe
2006, 32(12): 1427-1430.
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Influence of slot width on transmission properties of plannar FSS(frequency selective surfaces) was explained by physical essence. With the width of element slot in FSS increasing, it could shorten resonant wavelength of the element. Correspondingly it could increase the resonant frequency of the el...
Quiet zone analysis of a RF simulation anechoic chamber
Ma Yongguang, Chen Haibo, He Guoyu
2006, 32(12): 1431-1434.
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The performance of a RF(radio frequency) simulation anechoic chamber is influenced by many factors. With the geometrical optics methods, the quiet zone performance of a RF simulation anechoic chamber was analysed from the three factors, including microwave anechoic chamber layout, performance of rad...
Wavelet based fault detection of aeronautic engine vanes by borescope
Ding Peng, Li Changyou, Ma Qishuang, Yao Hongyu
2006, 32(12): 1435-1438.
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Using borescope equipment to inspect the inside of turbofan engines is an important technology to the daily fault diagnostic of aeronautic engine. In all the aeronautic engine interior faults, vane′s face fault is a regular one. Towards vane′s face fault, a kind of fault detection and estimation met...
Influence of source spectrum on bias stability of interference fiber optic gyroscopes
Li Yan, Ou Pan, Zhang Chunxi, Xu Hongjie
2006, 32(12): 1439-1442.
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The Jones matrixes and mathematical model for the optical transmission of IFOG(interference fiber optic gyroscopes) were built based on the polarization IFOG, which uses Y waveguide integrated optical modulator, and depended on the parameters of the optical instruments. The polarization errors were ...
Scheme design and FPGA implementation of airborne image lossless and near-lossless compression
Liu Bo, Jiang Hongxu, Lian Youpin, Lu Jinyuan
2006, 32(12): 1443-1446.
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For plane on-board image lossless and near-lossless compression, an improved compression algorithm based on the JPEG-LS was given. The algorithm is composed of three parts, decorrelation processor, adaptive entropy coder and controlling of compression ratio. The new decorrelation model solved the pr...
Robust ellipsoidal state bounding algorithm
Chai Wei, Sun Xianfang
2006, 32(12): 1447-1450.
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A numerically robust algorithm for computing ellipsoidal bounds on the state of a linear, discrete-time dynamic system was proposed. The algorithm employed ellipsoidal outer approximation of the feasible set assuming instantaneous process and observation noise vectors and the initial state to be bou...
Design and realization of coder in missile IFF system
Fang Huimin, Li Dongguang, Shi Gengchen
2006, 32(12): 1451-1454.
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One of the key technologies in the missile IFF (identification friend or foe) system is the encrypting transmission for the questioning and answering signals. To meet the ciphers requirements with larger capacity and stronger randomicity in the system, the M-sequence was introduced and its character...
Active spherical joint for modular reconfigurable mobile robot
Deng Zhicheng, Wang Wei, Zong Guanghua
2006, 32(12): 1455-1458.
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The present reconfigurable robots have several shortcomings about workspace and output torque in the pose-adjusting mechanisms. Aiming at these problems, a novel active joint was developed, which took advantages of the parallel mechanism and the serial mechanism and had characteristics of high outpu...
Development of bluetooth technique in industrial control system
Ma Fangkui, Huan Ji
2006, 32(12): 1459-1462.
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To solve the requirement problem of modern industrial control system to wireless communication technology, the bluetooth protocol was analysed and the integration and development of bluetooth wireless communication technique in industrial device control were introduced, which included accessing the ...
New manipulator calibration method based onscrew theory and distance error
Shao Zhiyu, Sun Hanxu, Jia Qingxuan, Ye Ping
2006, 32(12): 1463-1467.
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The installation of a sphere-wrist at the end of the manipulator is acommon characteristic of many robots. The sphere-wrist can be regarded as an important independent structure of a manipulator. Static errors of sphere-wrist will affect the pose precision of the end effector. Taking sphere-wrist as...
Investigation into elastic properties of anisotropic random foam model
Lu Zixing, Zhang Jialei, Wang Song
2006, 32(12): 1468-1471.
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In order to investigate the influence of cell microstructure anisotropy on the mechanical properties with random model, on the basis of isotropic Voronoi random foam model, anisotropic open-cell and closed-cell random foam models were established through considering cell growth rate difference. The ...
Improve electricity generation of microbial fuel cells by low intensity ultrasound
Yao Lu, Li Zhenglong, Liu Hong
2006, 32(12): 1472-1476.
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It is possible to produce electricity in microbial fuel cells(MFCs) while accomplishing biological wastewater treatment, but slow electron transference limits the development of MFCs. To improve the electricity generation, two similar single chambered MFCs were built, which had the available volume ...
Industrial CT imaging method for large objects
Wei Dongbo, Fu Jian, Gong Lei, Jiang Ming
2006, 32(12): 1477-1480.
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An industrial computed tomography(ICT) imaging method to enlarge the field of view was proposed to execute the rapid CT test of large objects. Its projection data rebin pre-processing method and filter back-projection reconstruction algorithm were deduced. The pre-processing method is from the fact ...
Irregular information distortion and weakening methods in supply chains
Wang Jing, Sun Haiyan, Li Yilan
2006, 32(12): 1481-1484.
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Based on information theory,systems engineering and control engineering theory,the uncertain information distortion problem in a simple two-stage supply chain was studied for the purpose of improving the stability of supply chain system. Firstly, the uncertain information distortion was generally de...
Simplification of unclosed mesh models with geometry and property boundary preservation
Shen Xukun, Zhao Xuewei, Qi Yue, Cai Su
2006, 32(12): 1485-1489.
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In practice, property information such as colors, textures, surface normals, etc. is necessary to represent 3D models besides geometry and topology information of triangle meshes, which will inevitably result in a large volume of 3D data as well as boundary edges and holes of mesh models. In order t...
Prototype selection of customized development process based on open source software
Wang Zhonglin, Yin Baolin
2006, 32(12): 1490-1494.
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Selecting an appropriate prototype for customized development process will increase development efficiency, decrease development costs and shorten development time. Based on the COCOMO(costructive cost model) II model, a new software cost assessment method was proposed to analyze the influence of th...
Auto-generation and configuration of visual modeling language editor
Zhang Li, Jiang Ke, Gao Hui
2006, 32(12): 1495-1498.
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Visual modeling language is a language, which uses graphics to describe the system or software, while visual modeling language editor provides support tool for it. The common between visual modeling language editors make it possible to use auto-generation and configuration. Based on years′ theory re...
Investment externality and game strategies of network security
Lü Junjie, Qiu Wanhua, Wang Yuanzhuo
2006, 32(12): 1499-1502.
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An investment game theoretic model was presented to study the externality in firms′ network security investment with different investment costs and profits.Taking virus contagion as an example, the negative investment externality exerted by the contagion between firms in the network was investigated...

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