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2006 Vol. 32, No. 02

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Engineering applications of structural optimization system based on Patran/Nastran
Yuan Jiajun, Chen Shenyan, Huang Hai
2006, 32(02): 125-129.
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Two satellite structures were optimized using a structural optimization system that was secondary developed on the base of the commercial finite element software Patran/Nastran. The mass of structure was taken as the objective function and frequency and stress constraints were considered in the opti...
Effects of free stream on flowfield and performance of linear aerospike nozzle
Wang Changhui, Liu Yu
2006, 32(02): 130-134.
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Numerical studies on effects of free stream on flowfield and performance of aerospike nozzle were presented. Aerospike nozzle performance losses and pressure distribution along plug surface were computed and compared at four different altitudes with typical free stream Mach numbers. It is shown that...
Modeling landing signal officer for carrier approach
Shi Ming, Cui Hailiang, Qu Xiangju
2006, 32(02): 135-138.
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The landing environment of carrier-based aircraft is extremely complex. The pilot needs to get the secondary command signal from landing signal officer(LSO) for final carrier approach and landing. It is necessary to include the LSO command model in the simulation model of carrier landing approach fo...
Discussion of integral technique for aerodynamics calculation
Liu Jie, Zhu Ziqiang, Chen Zemin, Wu Zongcheng
2006, 32(02): 139-143.
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A method called wake integration for the aerodynamics evaluation was discussed. Based on Euler equations to get the fluid field solution, this method applies the momentum theorem to a control volume that encloses an aircraft and it is improved from the traditional far field integration method. By do...
Inverse flight dynamics based algorithm for design of maneuvering trajectory tracker
Wang Heng, Zhang Shuguang
2006, 32(02): 144-147.
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The control architecture was constructed for maneuvering trajectory trackers, in which the inverse flight dynamics of aircraft was solved to determine the open loop command of control. Assumed that the open loop command could bring the aircraft to the neighborhood of the desired trajectory, a feedba...
Orbital debris clouds evolution phase definition
Dong Yunfeng, Xiao Yelun, Liu Jia, Wang Ting
2006, 32(02): 148-152.
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Orbital debris clouds evolution phase was defined as sphere, spheroid, rope, spiral, spreading and shell, based on the geometry shape and debris density in the evolution from the initial breakup point to the final coverage of earth. The shape character and the key drive sources were addressed in eac...
Numerical investigation of dynamic stall vortex movement of different-thickness airfoils
Wang Youjin, Yan Chao, Zhou Tao
2006, 32(02): 153-157.
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Dynamic stall of NACA airfoils of three kinds of different relative thickness undergoing pitching motion at low Mach number was numerically investigated. Dual time-step approach in conjunction with lower-upper symmetric-gauss-seidel(LU-SGS) implicit method were utilized to solve the unsteady navier-...
Comprehensive evaluation model for integrative cabin environment quality of airliner
Ning Xianwen, Li Yunze, Wang Jun
2006, 32(02): 158-162.
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To study the evaluation for integrative cabin environment quality of airliner, a comprehensive evaluation model using a stratified evaluation system was proposed. Thermal environments, cabin air quality and acoustical, visual and safe environments were assumed to be the first layer of an evaluation ...
Optimization designing method of wing flutter model for low-speed wind tunnel test
Lü Bin, Liu Deguang, Xie Changchuan, Yang Chao
2006, 32(02): 163-166.
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To solve the multidisciplinary problem of flutter wing model designing for low-speed wind tunnel test, which there is lots of difficulty in and expended abundant time conventionally, a design method named genetic/sensitivity-based hybrid algorithm was applied, which has very well global and local se...
Thermal system analysis and calculation for extravehicular spacesuit based on human body model
Qiu Yifen, Chen Yonghua, Yuan Xiugan
2006, 32(02): 167-170.
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The characteristic of space heat exchange was introduced for extravehicular spacesuit, the heat transfer process of the thermal system was analyzed among space environment, extravehicular spacesuit and the human body, and with the help of Visual C++ 6.0 and OpenGL a three-dimension human body model ...
Image matching algorithm based on feature point set for satellite attitude calculation
Cai Xiaodong, Ye Peijian
2006, 32(02): 171-175.
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Gray scale and geometry feature approaches were integrated. Feature point set was selected according to local texture energy distribution and geometry constraint of feature point set was utilized to construct templates describing the holistic feature of the image. A stepped refining image matching a...
Parameter influence analysis of free-wake numerical method
Zeng Hongjiang, Hu Jizhong
2006, 32(02): 176-180.
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The parameter influence of rotor free-wake method was presented, including blade discrete segments, vortices grid density and wake length. Several areas were made from blade root to blade tip. The inside area was segmented coarsely but the tip area was segmented more densely. The segment density of ...
General-utility testing path model of switches for ATE and application
Zhao Ruixian, Meng Xiaofeng, Wang Guohua
2006, 32(02): 181-185.
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In order to solve the questions such as searching testing path, judging testing path conflict and managing testing path of switches during the course of programming testing programs (TP) of automation testing equipment (ATE), a general-utility testing path model of switches was brought forward, the ...
Visual computation of glint error for complex targets
Fang Ning, Ning Huansheng, Wang Baofa
2006, 32(02): 186-189.
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The glint error is one of the important error sources in radar tracking on extended target. In practise, the lose-possibility has been risen greatly in teams of the glint error of the scattering wave in radar tracing and guiding system. So the research of glint error can improve the accuracy of trac...
Fault-tolerance operation of brushless DC motor for flight control
Zhou Yuanjun, Dong Huifen, Wang Ziqiang
2006, 32(02): 190-194.
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The operation of a brushless DC motor with dual-windings for the flight control system was described. The dual-channels electro-mechanical actuator (EMA) is composed of the motor, the fault-tolerance operation mode can be obtained when any channel is failure. The mechanical characteristic, power los...
Theory analysis and experiment of random modulation in FOG
Zhang Xi, Pan Xiong
2006, 32(02): 195-198.
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Bias stability is an important performance of gyro. But in digital closed loop fiber optical gyro(FOG), it is influenced extremely by the electrical crosstalk in the electronics. Output drift can be reduced by using random modulation.The crosstalk of square wave modulation and random modulation was ...
Reconstruction of inner surface with data points acquired by structured light scanning
Li Zhang, Zhou Fuqiang, Zhang Guangjun
2006, 32(02): 199-203.
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A method for reconstructing the inner surface with feature data points acquired by structured light scanning was proposed. Feature data points acquired by structured light scanning are accurate and the distribution density of those data points is nonuniform. Some redundancy points on the measuring d...
Mechanism and suppression of extraneous torque of motor driver load simulator
Li Chenggong, Jin Hongtao, Jiao Zongxia
2006, 32(02): 204-208.
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Based on an introduction to the mechanical structure and operating principle of the load simulator drived by the direct current torque motor, a mathematical model of the actuating mechanism of the electrical loading system was founded and was expressed by means of block diagram. The mechanical chara...
Algorithm for delay constraints optimal path calculation
Zhang Tao, Liu Zhongkan, Zhang Jun
2006, 32(02): 209-213.
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As one of the most challenging problems in the QoS Routing and traffic engineering, the problem of delay constraints optimal path calculation has the non-polynomial(NP) complete complexity. The algorithm which is proposed in literature has some problem, such as not getting optimal path and being ver...
Wavelet and nonlinear model based borescope image compression
Ding Peng, Ma Qishuang, Li Changyou, Yao Hongyu
2006, 32(02): 214-217.
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The borescope image quality around edges is very important to the fault diagnostic of aeronautic engine. And inside the turbofan engine, the borescope image often has complex edges and textures. To achieve high compression ratio without losing of the edge and texture information, a kind of image com...
Maximal frequent itemsets mining algorithm based on effective pruning mechanisms
Chen Peng, Lü Weifeng
2006, 32(02): 218-223.
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The maximal frequent itemsets mining problem was studied and an algorithm based on pruning itemset lattice effectively was proposed. The itemset lattice tree data structure was adopted to translate maximal frequent itemsets mining into the process of depth-first searching the itemset lattice tree. O...
Audio similarity measure based on distance correlation image
Li Chao, Xiong Zhang, Zhu Chengjun
2006, 32(02): 224-227.
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Similarity measure is one of the keys of content-based audio analysis. Traditionally, statistic methods are used for accomplishing the aim. But it is hard to represent the results in a visual way and it shows very weak relationship with semantic layer. An image segmentation-based method was introduc...
Real-time solution for Cyber data acquisition simulation system in petroleum industry
Li Wei, Wang Lei
2006, 32(02): 228-232.
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In order to reserve the valuable software and hardware fruits of the Cyber data acquisition system,the method of software simulation was adopted to build a simulation system on a modern high performance hardware platform．Petroleum industry’s Cyber data acquisition simulation system was modeled by ta...
Research on mechanism of actuated active reflectors for FAST
Lu Zhen, Yang Guang, Wang Qiming, Nan Rendong
2006, 32(02): 233-238.
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A new type of actuate mechanism for the active reflector of FAST(five-hundred-meter aperture spherical telescope) radio telescope was proposed so that one can overcome the deficiency of original actuate mechanism. The mechanism was utilized to prevent from the sideslip in the margin cell of the acti...
Hermite method convergence analyses and improvement
Wang Ruiqiu, Bian Yongmei, Chen Wuyi
2006, 32(02): 239-243.
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To make multi-points tangent contact machining have higher computational efficiency, an improved algorithm based on Hermite method was proposed. Theoretical analyses were given on the convergence of the improved algorithm, and the constraints for local convergence of the new algorithm were also deri...
Time-frequency characteristics research for pressure waves of fuel injection system of diesel engine
He Yongling, Yan Zhiqiang
2006, 32(02): 244-248.
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In research of pressure wave of fuel injection system of diesel engine, with Wigner-Ville distribution, the time-frequency characteristics of pressure wave in fuel injection system of a diesel engine under condition of liquid-gas tow-phase flow was analyzed. The comparison of its results with the re...

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