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2007 Vol. 33, No. 12

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Rotation effects on the film covering area
Yang Xiaojun, Tao Zhi, Ding Shuiting, Xu Guoqiang
2007, 33(12): 1383-1386.
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Experimental research was conducted to investigate the rotation effect on the film covering area, which is important to comprehend the mixing process of the coolant flow and the hot gas over the high pressure turbine blades. A simple flat surface with a 30° inclined film hole was positioned parallel...
Parameters self-tuning fuzzy-PID combined with expert control on wind velocity control system of wind tunnels at home
Li Ke, Liu Wangkai, Wang Jun
2007, 33(12): 1387-1390.
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The structure and the characters of wind velocity control system of D-4 low velocity wind tunnel at home having been built in Beijing University of Aeronautics and Astronautics was introduced. Due to the difficulties of establishing mathematical model, the complicated nonlinear characters and the ch...
Parametric modeling and optimization of low observability fuselage in aircraft conceptual design
Bai Zhendong, Liu Hu, Wu Zhe
2007, 33(12): 1391-1394.
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Parametric modeling method on typical sections of fuselages was studied to improve the efficiency of low observability fuselage modeling in aircraft conceptual design. Several design parameters of section curves were defined to adjust the control points of B-spline, and then typical sections of fuse...
Two dimensional Voronoi grid technology applied in the DSMC method
Hou Fenglong, Cai Guobiao
2007, 33(12): 1395-1399.
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The Voronoi grid technology applied in the direct simulation Monte Carlo (DSMC) method was researched. Basing on the Dirichlet tessellation and Voronoi diagram theory, the Voronoi cells were defined by thier tessellated points and the peculiar arithmetic mapping particles to cells satisfied the stat...
Burning surface calculation for grain embedded metal wires based on SolidWorks API
Xiong Wenbo, Liu Yu, Yang Jinsong
2007, 33(12): 1400-1403.
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A simpler and more accurate of propellant grain calculation which is based on SolidWorks API interface and Visual Basic has been developed for grain embedded metal wires. It can build parametrical model for grain embedded metal wires automatically and distill burning surface which occurs during burn...
Analysis of traction trafficability of diameter-variable wheel for planetary rover
Sun Peng, Gao Feng, Li Wen, Sun Gang
2007, 33(12): 1404-1407.
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A planetary rover with diameter-variable wheels was represented which has advantages of compact structure, good climbing obstacle capability, low gravity center, and traveling stability. In consideration of lunar gravity environment and mechanical property of lunar regolith, the interaction between ...
Design and performance simulation of a new type wheel with claws
Yue Ronggang, Wang Shaoping, Jiao Zongxia, Kang Rongjie
2007, 33(12): 1408-1411.
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Aiming at the disadvantages of current planetary rover wheel, a new type climbing obstacle wheel with claws was designed according to the complex planetary surface environment. Its main innovation is the claw on wheel. Mechanics analysis of the new type climbing obstacle wheel was computed, and the ...
Calibration and compensation periodic error in quartz MEMS gyroscope drift
Zhang Haipeng, Fang Jiancheng, Sheng Wei
2007, 33(12): 1412-1416.
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It was found in experiments that the drift of quartz series MEMS(micro electromechanical system)gyroscopes had good orderliness and periodicity against other series MEMS gyroscopes, especially in short-time and high frequency sampling. In order to improve the precision of the quartz gyroscope and th...
Synthesis algorithm of multifractional Brownian motion with wavelet
Wang Zhaorui, Lü Shanwei, Nakamura Taketsune
2007, 33(12): 1417-1419.
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In practice, the signals being analyzed are often very far from regular or smooth, and these irregular signals usually have many non-differentiable points, even nowhere differentiable. To describe the signal whose pointwise singularity varies along the sample path, in terms of the concept of multifr...
Test resource coalition formation in open flexible test system
Bian Zeqiang, Meng Xiaofeng, Chen Yue
2007, 33(12): 1420-1423.
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To solve the rapid creation of the open flexible test system (OFTS), the complicated test task was disassembled into sub-test set based on signal type at first. Consulted about the unified color and individual color of polychromatic sets theory, a best test resource coalition formation model was est...
Satellite selection algorithm for combined satellite receivers
Zhang Qiang, Zhang Xiaolin, Li Hongwei, Chang Xiaoming
2007, 33(12): 1424-1427.
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On the basis of the relationship between the determinant of a 5×5 matrix and five satellites- geometry dilution of precision(GDOP), a method of selecting satellites for double constellation combined receiver (e.g. GPS(global position system) and BD2(BeiDou2) combined receiver) was proposed. With thi...
Finite field model of concatenated prime codes
Liu Qingge, Shao Dingrong, Li Shujian
2007, 33(12): 1428-1431.
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Based on the construct idea of prime codes and the transformation relation between finite ground fields and finite extension fields, the construction of concatenated prime codes was analyzed in polynomials form and the finite field model was deduced. The model indicates that concatenated prime codes...
Energy transmission characteristic of PLZT bimorph
Liang Lei, Wang Shaoping, Cao Feng, Deng Weiti
2007, 33(12): 1432-1435.
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The mechanism of the photostrictive effect of lanthanum-modified lead zirconate titanate (PLZT) ceramics was researched. The theoretical analysis showed that photostriction was the superposition of photovoltaic and converse piezoelectric effects. The maximal deflexion and drive force of PLZT bimorph...
Fuzzy modeling of rate-dependent hysteresis loop in giant magnetostrictive actuator
Guo Zhenkai
2007, 33(12): 1436-1439.
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Hysteresis is a strongly nonlinear phenomenon which exists in the input and output property of a giant magnetostrictive actuator, which has influence on the precision and stability of active vibration control. So a method based on fuzzy tree model was presented to describe the hysteresis nonlinearit...
Implementation of 32k points ultra high speed FFT processor based on FPGA devices
Li Wei, Sun Jinping, Wang Jun, Li Shaohong
2007, 33(12): 1440-1443.
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An ultra high speed 32k point pipelined fast Fourier transform (FFT) processor was designed with FPGA (field programmable gate arrays) implementation. The processor can operate at 125 MHz and is able to handle a continuous input complex data stream of 1 Giga-samples per second. The FFT processor is...
Automatic geometry alignment for muti-projector image display wall
Peng Junyi, Chen Huan, Dai Shuling
2007, 33(12): 1444-1447.
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A practical and scalable alignment automation system for muti-projector display wall was constructed based on the measurement of low-performance cameras. Taking the advantage of re-alignment theory the homography matrix was refined and used to achieve seamless alignment across different areas on the...
Multisensor multipled hypothesis algorithm based on data compressing technic
Zhang Jingwei, Xiong Wei, He You
2007, 33(12): 1448-1451.
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In order to solve the problem of multitarget tracking in centralized multisensor situation, a new multisensor multitarget tracking algorithm was presented. At first, the algorithm permuted and combined the measurement from each sensor using the rule of generalized classical assignment algorithm. The...
Information increment and information value of demand information in supply chains
Wang Jing, Li Yuxiang, Wang Xu
2007, 33(12): 1452-1456.
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The definition and measurement of information increment and information value of demand information in supply chains were given, basing on theory of information science. It showed how a certain piece of demand information took effect in the process of making a decision on order, and how the wholesal...
Digital product model support methods in aircraft collaborative development
Tao Jian, Fan Yuqing
2007, 33(12): 1457-1461.
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Effectivity and consistency of product data are the precondition of collaborative development pattern. Digital product model (DPM) acts as carrier of product data and relation information, and its effectivity will affect the purpose of collaborative development. The importance of DPM was emphasized ...
Design and simulation of highly stable and precise tracking-pointing platform
Cui Long, Huang Hai
2007, 33(12): 1462-1465.
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In order to implement high accuracy space tracking-pointing task, highly stable and precise tracking-pointing mechanism with vibration control ability was designed. The mechanism adopts 6-SPS Stewart configuration. Utilizing macro-micro actuators, high accuracy pointing movement was implemented in l...
Single-factor uncertainty analysis of project-s duration based on float
Li Xingmei, Qi Jianxun, Su Zhixiong, Wang Jing
2007, 33(12): 1466-1470.
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In order to analyze the sensitivity of variety of single activity completion time to project-s duration, by probabilistic analysis principle and approach, the probability of terminative time-s change of activity under different conditions was confirmed, and the system of decision evaluation index wa...
Hybrid genetic algorithm for multiple process and batch scheduling in job-shop
Lin Nan, Meng Biao, Fan Yuqing
2007, 33(12): 1471-1476.
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Combined with the heuristic rule and the simulated annealing algorithm, an improved genetic algorithm GASA(genetic algorithm-simulated annealing algorithm) was put forward. This algorithm adopts the new type of POX cross operators and takes advantage of the simulated annealing algorithm which could ...
Disclosing method for protecting sensitive certificate
Jiang Zhengtao, Huai Jinpeng, Wang Yumin
2007, 33(12): 1477-1480.
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Further investigations on the problem of disclosing sensitive attribute certificate were provided. To enhance its security assurance, cryptographic mechanisms were utilized and a certificate disclosure scheme based on which was proposed, which realized the following characteristics: At last resource...
Semantic-based resource cooperation mechanism
Chen Jiangfeng
2007, 33(12): 1481-1485.
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In order to improve the efficiency of the resource cooperation, according to the static functional characteristics, the similarity function and function-based resource cooperation algorithm was provided; according to the runtime QoS characteristics, the runtime QoS resource cooperation algorithm was...
Description language oriented to attack tree model
Tang Shujun, Li Xiaojian, Tu Shouzhong, Wei Gang
2007, 33(12): 1486-1490.
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A main problem of recent researches on network security simulation is the lack of methods to model attack and uniform description. Hence computer network attack description language(CNADL) was presented, with attack tree adopted to model attacks and describe purpose, characteristic and process of at...

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