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2009 Vol. 35, No. 7

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Unsteady drag measurements for flow over a circular disk
Hu Ye, Wang Jinjun
2009, 35(7): 783-785.
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Abstract:

Unsteady drag measurementsw ere conducted in a low speed wind tunnel to investigate the drag of the circular disk which was normal to the flow. The circular disk was interfered by an upstream two-dimensional rod in the horizontal symmetry plane of the disk in the Reynolds number range from 0.44×105 ...
Bayes comprehensive assessment of reliability for binomial products by using test information of similar product
Yang Jun, Huang Jin, Shen Lijuan, Zhao Yu
2009, 35(7): 786-788.
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Abstract:
For reliability assessment of binomial products, the history sample and the current sample often follow different populations, which have remarkable effect on reliability assessment. The similarity degree between the history sample and the current sample were studied by similar system analysis, and ...
Architecture of software-based GNSS signal simulator and implementation of its IF signals generation
Zhao Yun, Kou Yanhong, Huang Zhigang, Zhang Qishan
2009, 35(7): 789-793.
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Abstract:
The software-based global navigation satellite systems(GNSS) signal simulator would be an enormous asset for the efficient development of GNSS receivers, due to its flexible structure, the possibility for easy updates and changes and low cost. A hybrid GPS/Galileo intermediate frequency(IF) software...
Modeling design of general purpose ATE
Shen Li, Shen Shituan
2009, 35(7): 794-798.
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Abstract:

Aiming at the problems in the modeling design of general purpose automatic test equipment(ATE) and in order to satisfy the requirement of the model of ATE , a integrated ATE model was presented based on signal. The ATE hardware and unit under test(UUT) are both made models. A basal signal model was ...
Simulation of liquid slosh in braking process of tank truck
Liu Kui, Kang Ning
2009, 35(7): 799-803.
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The liquid sloshing in braking process of tank truck was simulated by volume of fluid (VOF) model. The forces and their locations of a single room and weight distribution of a truck were calculated. The reliability of the calculation method was validated by comparing with experimental results. The r...
Application and analysis of formation satellites cluster orbit transfer based on genetic algorithm
Li Jingsheng, Deng Zhongmin
2009, 35(7): 804-806.
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Abstract:
Orbit transfer of formation satellites was a potential way for future spacecrafts. The Lambert maneuver problem of formation satellites with initial and target positions was studied. Relative motion model including central orbit elements and perturbation was set up using Gim-Alfriend matrix, and an ...
Synthesis and atomic oxygen resistance of phosphorus-containing polyimide
Su Yingxia, Wang Kai, Zhan Maosheng
2009, 35(7): 807-811.
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A series of phosphorus-containing polyimide films were synthesized by a self made phosphorus-containing diamine, bis( m -aminophenyl)phenylphosphine oxide (DAPPO). The atomic oxygen (AO) resistance testes of films were carried out using a ground-based atomic oxygen effects simulation facility of Bei...
Numerical investigation of film cooling effectiveness over rotating curved surfaces:blowing ratio and curvature effect
Wu Hong, Meng Henghui, Zhao Zhenming, Wu Hongwei
2009, 35(7): 812-816.
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Abstract:
Numerical method was conducted to investigate film cooling performance over different rotating surfaces. Compared different models, the influences of curve and blowing ration were obtained with different conditions. The results show that: more film cooling effectiveness is obtained in low blowing ra...
Tentative of reliability integrated assessment method based on exponential regression model
Wan Bo, Fu Guicui, Yao Jun
2009, 35(7): 817-820.
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Abstract:
The multi-regress-analysis reliability assessment method was built based on the exponential regression model with environmental severe degree factor, environmental integrated factor and technique state of the product factor, which aims at the less information because of the fewer ones for testing in...
Design optimization of satellite platform considering multiple structural cases
Zhou Zhicheng, Qu Guangji, Huang Hai
2009, 35(7): 821-823.
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The engineering system of structural optimization for spacecraft(ESSOSⅡ) was applied in the optimization design of a complicated satellite structure, in which the minimum weight was taken as the objective, the layer thicknesses of composite laminate panels as the design variables, and the frequencie...
Anti-atomic oxygen properties of silicone coating modified by nano-ZnO
Wang Jing, Li Weiping, Chen Yichi, Zhu Liqun
2009, 35(7): 824-827.
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Abstract:
To improve the anti-atomic oxygen properties of silicone coating, nano-ZnO modified by silane coupling reagent was filled in the silicone resin and nano-ZnO/silicone composite coating on polyimide film was obtained. Polyimide with and without nano-ZnO/silicone coating was exposed to atomic oxygen(AO...
BOC signal multi-path mitigation technique based on wavelet analysis
Zhu Di, Shen Gongxun
2009, 35(7): 828-832.
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Abstract:
Satellite navigation receives requires to tracking code phase of satellite-s signals precisely because it affects the precision of pseudo-range directly. However, the multi-path effect introduces quite big errors to the traditional delay locked loop(DLL)-based estimators. An algorithm of multi-path ...
Denoising of micro-CT image based on improved NL-means algorithm
Li Baolei, Yang Min, Li Junjiang
2009, 35(7): 833-837.
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Abstract:
Micro-CT(computed tomography)is based on microfocus X-ray source and the ray dose is low. So the noise level of micro-CT image is big and denoising of the CT image is very necessary. The current main denoising methods for CT image and their advantages and disadvantages were summaried. The NL(nonloca...
Experimental investigation of rotation number effect on film cooling over a convex surface
Zhao Zhenming, Wu Hongwei, Ding Shuiting, Xu Guoqiang
2009, 35(7): 838-841.
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Abstract:
Experimental study was conducted to investigate the influence of rotation number ( Rt=ωD/u ∞) on the film cooling performance over a convex surface. Measurements of film cooling effectiveness η ad and heat transfer coefficient h f were presented for single film hole. Thermochromic liquid crystal (TL...
Multichannel reservation MAC protocol for mobile ad hoc networks
Xing Xiaoqin, Liu Kai
2009, 35(7): 842-847.
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Abstract:

A novel multichannel reservation multiple access (MRMA) protocol was presented for efficient channel sharing in mobile ad hoc networks. It employed request-to-send (RTS) and clear-to-send (CTS) dialogue on a common channel and flexibly selected conflict-free traffic channel to accomplish the transmi...
Generation method of walsh function based on balanced matching property
Guo Jia, Yang Dongkai, Li Shujian, Shao Dingrong
2009, 35(7): 848-851.
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Abstract:
Balanced matching property is a new property of Walsh function sequence and is equal to its orthogonality. Using balanced matching property and the concept of linear space in Galois field, a generation method of orthogonal function sequence was produced, and this method only need compute two matrixe...
Fractal characterization of uniformity of discrete phase in nanocomposites
Nie Peng, Wang Xinxin, Gao Ji, Zhang Kaifeng
2009, 35(7): 852-855.
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Abstract:
The traditional method to evaluate uniformity of discrete phase in polymer nanocomposite is deficient. A quantitative description method was proposed to evaluate uniformity of filling particles in polymer nanocomposite. The method is based on the mathematical model of fractals theory and takes the T...
Lateral and directional flight qualities of the saucer-shaped aircraft
Wang Linlin, Gao Ge
2009, 35(7): 856-859.
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The saucer-shaped aircraft is a novel aircraft adopting blend-wing-body configuration. The linear perturbation theory based on the classic flight dynamics was used to analyze the lateral and directional flight qualities of the saucer-shaped aircraft under low speed conditions, and the time-domain me...
Design and dynamic simulation of hydraulic system for AT
Wang Shuhan, Xu Xiangyang, Liu Yanfang, Peter Tenberge
2009, 35(7): 860-864.
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Abstract:
A new hydraulic system in AT was designed. The parameters of every valve was designed by theoretical calculation. The dynamic simulation model of hydraulic system of AT was established by ITI-SimulationX. Simulation results and theoretical design results were compared to confirm the simulation model...
Two impulses transfer trajectory design for Sun-Earth libration point missions
Li Mingtao, Zheng Jianhua, Yu Xizheng, Gao Dong
2009, 35(7): 865-868.
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Abstract:
Two impulses transfer trajectory design based on the least differential corrections method was studied, differential correction equation with the altitude and the flight path angle constraints was concluded, and the convergence of the method was discussed. Halo orbit around the L1 libration point of...
Algorithm of radar-IFF correlation in back-to-back configuration
Yan Hongxing, Wang Xiaobo, Wang Guohong, Wang Chenxi
2009, 35(7): 869-872.
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To solve the problem of radar-IFF correlation in back-to-back configuration, an algorithm was discussed, mainly including time-alignment between radar tracks and identification friend or foe(IFF) points, construction of discriminate functions, choice of the decision-making rule, and computation form...
Fuzzy-PID control method of vehicular DYC
Wang Weida, Ding Nenggen, Xu Xiangyang, Zhang Wei
2009, 35(7): 873-876.
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Direct yaw-moment control (DYC) is a very important methodology of enhancing the vehicle stability, and its research is of great significance for improving the active safety of vehicle. Based on the in-depth study of the vehicular handling dynamics and the advanced control theories, a fuzzy-PID cont...
3D data registration method for vision measurement
Xie Guanghui, Sun Junhua, Yang Zhen, Zhang Guangjun
2009, 35(7): 877-881.
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Abstract:
A 3D data registration method was proposed for vision measurement using mark points as global measurement control points. Mark points were attached to the measured objects and one or more baseline rulers were put in the measured area. The images of mark points and the baseline rulers were captured b...
Visual aid for teleoperation applied to satellite on-orbit self-servicing
Zhang Guoliang, Liu Hong, Jiang Zainan, Wang Jie
2009, 35(7): 882-886.
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Abstract:
To overcome effect of time delay on space robot teleoperation, a novel method of vision aid for teleoperation applied to satellite on-orbit self-servicing was presented. A vision-based shared control scheme was designed and implemented to deal with data transmission delay. The scheme consists of fre...
Cooperative trajectory planning for UAV towards moving target aground
Zeng Jia, Shen Gongzhang, Xia Jie, Yang Lingyu
2009, 35(7): 887-890.
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Abstract:

In contrast to the most existing unmanned aerial vehicle (UAV) cooperative trajectory planners that are suitable for stationary targets, a novel decentralized cooperative trajectory planning method for UAV towards moving target aground was proposed. The decentralized cooperative trajectory planning ...
Geomagnetic mapping and validity estimation
Huang Xuegong, Fang Jiancheng, Liu Gang, Jiang Yanwei
2009, 35(7): 891-894.
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One of the key technologies of geomagnetic matching navigation is looking for high accuracy geomagnetic map. Based on introducing the principles of four kinds of interpolation methods (inverse distance to a power method, Kriging method, modified Shepard-s method and radial basis function method), th...
New product conceptual design scheme generation method based on ontology mapping
Bi Luyan, Jiao Zongxia, Fan Shengtao
2009, 35(7): 895-898.
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The ontology and ontology mapping technology were introduced into the conceptual design schema generation field. A new conceptual design scheme generation method based on ontology mapping was proposed to solve the problems of design knowledge reuse difficulty and low accuracy in conceptual design sc...
Technology of light-weight design for wire-winding prestressed cylinder structure
Li Huili, Lang Lihui, Jiao Wei, Su Huaizhong
2009, 35(7): 899-903.
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Based on the iso-shear stress theory a light-weight wire-winding prestressed working cylinder for isostatic pressing equipment was designed through application of the multi-island genetic algorithm. A light-weight design model was defined. The maximum inner pressure in the cylinder was 300MPa and t...
Performance analysis and improved method for airborne three-channel SAR/GMTI system
Shi Hongyin, Zhou Yinqing, Chen Jie
2009, 35(7): 904-908.
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A comprehensive performance analysis method of three-channel SAR(synthetic aperture radar) GMTI(ground moving target indication) was presented after analyzing the theory of conventional three channel SAR ground moving target indication methods. The main error factors such as velocity variety of rada...

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