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2010 Vol. 36, No. 6

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Influence of Gurney flap on longitudinal aerodynamic characteristics of  multiple-control-surface UAV
WANG Jin-Jun, ZHANG Zi-Jun, FENG Li-Hao
2010, 36(6): 631-635.
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An experiment had been conducted to investigation the effect of different control surfaces with Gurney flaps on the aerodynamic characteristic of a multiple-control-surface tailless aircraft model. It is found that either the individual elevons and flaperons, or their combinations with Gurney flaps ...
Simulation and experiment of random errors of MEMS gyroscope
2010, 36(6): 636-639.
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The random errors of a micro electro mechanical system (MEMS) gyroscope was analyzed and modeled to improve gyroscope performance. Time series analysis was used to fit the gyroscope measurement data which had been preprocessed. State vector augmenting method was proposed to design Kalman filter. In ...
Modeling and reducing of water hammer of proportional direction valve controlled ship steering system based on AMESim
Fu Yongling, Zhao Gang, Qi Xiaoye, Ji Youzhe
2010, 36(6): 640-644.
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In proportional direction valve controlled ship steering system, the proportional direction valve could generate water hammer when it changes direction. Bad affects could be lead to not only the hydraulic steering system but also the ship itself. The model of proportional direction valve controlled ...
Dynamic instability of helicopter transmission rotating shafts with spline coupling
Kang Lixia, Cao Yihua
2010, 36(6): 645-649.
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To transfer torque effectively, spline coupling is widely used in rotating machinery, and it can be adopted in helicopter transmission system. Theory analysis on stability of the supercritical rotating shaft was conducted. And the corresponding experimental verification on the helicopter tail transm...
Design and optimization on trajectory of increasing velocity along its original -velocity direction by impulse firing for ballistic missile to penetrate anti-missile system in passive ballistic curve
Zhang Bin, Ren Junxue, Wang Yibai, Liu Yu
2010, 36(6): 650-653.
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A fly dynamics model of ballistic missile to penetrate the anti-missile system in the passive ballistic curve, which was based on the increasing velocity along its original velocity direction, was established. The influences of the impulse engine work time and the impulse engine ignition time on tra...
Vertical flight trajectory optimization of heavy military airlift aircraft
2010, 36(6): 654-658.
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Vertical profile flight trajectory of heavy military airlift aircraft, which is often time-critical was optimized. Flight time was chosen as the cost function and divided into climb, cruise and descent parts. Flight point-mass motion equation was transferred into equivalent-energy form using energy-...
Extraction of saliency-gist features and target detection for remote sensing images
Li Zhicheng, Qin Shiyin, Itti Laurent
2010, 36(6): 659-662.
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An automatic approach to detect and classify targets in high-resolution broad-area remote sensing images is explored, which relies on detecting statistical signatures of targets, in terms of a set of biologically-inspired lowlevel visual features. The broad-area remote sensing images were first cut...
On orbital maneuver window for servicing spacecraft
Cai Yuanwen, Shen Gongxun, Yu Xiaohong
2010, 36(6): 663-666.
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The development and implement of space technology made the on-orbital service be possible. On account of kinds of constraints-affection, the maneuver time and time period should be chosen carefully for the servicing spacecraft (SSC) to provide on-orbital services. The concept of maneuver window was ...
Prediction of military UAV development cost based on partial least-square regression method
Luo Wei, Liu Lu
2010, 36(6): 667-670.
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The basic model was formulated based on the partial least-squares regression method, which has some prominent advantages in dealing with small sample and variables with multiple correlations, and the arithmetic steps of the development cost prediction of the military unmanned air vehicle were given,...
Large-stroke Hexapod platform and its vibration isolation test
Cui Long, Huang Hai
2010, 36(6): 671-675.
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In order to improve observation precision of vehicular and airborne optical equipment, large-stroke 6 degree freedom active vibration isolation platform was designed. The actuator of Hexapod platform adopted linear motor, and to use in vibration isolation mission, gapless gimbal joint was designed. ...
Space swept algorithm based assembly path planning method for aircraft
Qiu Xi, Wei Shengmin, Cheng Hui
2010, 36(6): 676-680.
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In order to get effective assembly path, a space swept algorithm based assembly path planning method to plan the assembly path of aircraft was presented. Firstly, by considering the rules of assembly fixtures and tools in aircraft assembly process, the whole process of assembly path planning for air...
Eigenrotation-based rigid body tracking system with sliding mode controller
Li Tiejun, Huang Hai
2010, 36(6): 681-685.
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A sliding mode control(SMC) method was derived and applied to a rigid body attitude tracking system in the presence of dynamic uncertainties which included uncertainties and variations in its inertia parameters, uncertainties in its control actuator alignment and external disturbances. A feedback li...
Application of chebyshev spectral boundary element method to acoustic-scattering computation
Yang Mingsui, Wang Tongqing, Fan Zhenzhen
2010, 36(6): 686-689.
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On the basis of boundary element theory, combined with Chebyshev spectral element method, acoustic scattering numerical computation was studied. The second order boundary element was used in the computation of acoustic scattering field. Chebyshev-Gauss, a spectral collocation point method, was used ...
Effect of orifices‘diameter on heat transfer and flow resistance characteristic of passage
Li Li, Xu Guoqiang, Ding Shuiting, Deng Hongwu
2010, 36(6): 690-693.
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Numerical simulation was performed to obtain heat transfer and flow resistance characteristics in a channel with zigzag divider wall. Six configurations with different diameters of the orifices were designed to predict the effect of the orifices’diameter on heat transfer of passage. The simulation r...
Cartesian grid technology applied in DSMC method
Hou Fenglong, Cai Guobiao
2010, 36(6): 694-699.
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The Cartesian grid technology applied in DSMC (direct simulation Monte Carlo) method was studied. A strategy of counting the boundary triangle surface elements in each Cartesian grid cell for establishing the mapping relationship from bug cells to surface elements was adopted. Further more, the bug ...
Empirical research on meta-competency evaluation model based on multiple dimensions hierarchical entropy
Li Junfeng, Du Bin
2010, 36(6): 700-703.
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In order to upgrade effectiveness of human resources, reduce employing risk and evaluate individual competency, the equilibrium decision model based on multiple dimensions hierarchical risk entropy was presented for human resources evaluation of spaceflight product project. Firstly non-linear solid ...
Flow superposition design method and CFD simulation for the impeller of water pump
Li Lihong, Liu Yanfang, Xu Xiangyang, Ji Fenzhu
2010, 36(6): 704-707.
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The blade of impeller, which is complicated spatial curved volume, directly influences on its hydraulic performance and running stability. Basing on the flow law of liquid, flow superposition design for the impeller of engine water pump was applied following to the flow trail. The flow of liquid in ...
Approach to mobile robot localization based on incremental landmark appearance learning
Wu Hua, Qin Shiyin
2010, 36(6): 708-712.
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Robot localization with omnidirectional vision becomes much difficult as the landmark appearances change dramatically in the omnidirectional image. An approach to mobile robot localization with omnidirectional vision was proposed, which used incremental landmark appearance learning to deal with chan...
System maintainability allocation improved method based on the time character
Zhou Dong, Lv Chuan, Wang Meihui, Huo Lin
2010, 36(6): 713-718.
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The maintainability allocation work has unreasonable aspect in the engineering application at the present time. According to the traditional method, the allocated time can not be controlled by the design department, and it is hard to achieve the real purpose of maintainability allocation. For this q...
Modified SAR image segmentation method based MRF with fast simulated annealing
Liu Xianghua, Zhou Yinqing, Sun Muhan
2010, 36(6): 719-722.
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Markov random field (MRF) approaches are able to implement better SAR image segmentation by combing the image intensity and structure information. However, this kind of approaches often obtains a global solution at the cost of computational burden. A fast simulated annealing method was presented by ...
Execution engine for real-time embedded software test -design and realization
Yin Yongfeng, Liu Bin, Wang Chen
2010, 36(6): 723-727.
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In automatic real-time embedded software testing, the design and realization of test description execution system is one of the key problems. Based on object-oriented programming thought, an execution engine oriented automatic real-time embedded software test description language (RT-ESTDL) was desi...
Timing offset compensation algorithm for OFDM system
Sun Yuming, Zhang Yanzhong, Shao Dingrong, Li Shujian
2010, 36(6): 728-731.
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To eliminate the effect of orthogonal frequency division multiplexing (OFDM) system symbol timing offset on channel estimation, a compensation algorithm was presented. The theoretical analysis shows the phase shift is calculated as the change of statistical properties and the channel estimation erro...
Routing protocol based on cross-layer design in wireless sensor networks
Wang Guangxue, Liu Kai
2010, 36(6): 732-735.
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Interference in wireless sensor networks (WSNs) not only causes packet loss and delay, but also leads to excessive energy consumption. It is necessary to mitigate interference in order to improve transmission and energy efficiencies. To achieve this objective, a novel interference-aware routing (IAR...
Mixed guidance method for  reentry vehicles based on  optimization
Wang Junbo, Tian Yuan, Ren Zhang
2010, 36(6): 736-740.
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The error caused by the calculating time delay of predictive guidance was analyzed for the mixed guidance based on the reference-trajectory guidance and predictive guidance for reentry vehicles. The method of error compensation was put forward. By utilizing the optimization theory, performance index...
Denoising method to dynamic digital X-ray images and its fast implementation
Wang Gang, Yang Min
2010, 36(6): 741-744.
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For the dynamic digital X-ray imaging system, in order to solve the degradation of DR (Digital Radiography) image quality, NL-means algorithm was introduced for the DR image denoising by using the Anscombe transform. In order to solve its complex calculation and time-consuming problem, GPU (Graphic ...
Shape optimization for contact problem based on MLPG mixed collocation method
Zhao Liang, Li Shu
2010, 36(6): 745-748.
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The theory of contact problem and meshless local Petrov-Galerkin(MLPG) mixed collocation method was introduced, the correlative formula was conducted, and the definite condition of two typical contact state was presented. The MLPG mixed collocation method was used in contact analysis through two-dim...
Implementation of dual CPU redundant control based on DeviceNet field bus
Wang Ding, Li Duo
2010, 36(6): 749-752.
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An implementation of dual CPU(central processing unit) redundant control based on DeviceNet field bus was introduced. Dual CPU redundant design played an important role to improve the DCS(distributed computer system) reliability. In the implementation, two CPU units and some data I/O(input/output) u...
Technology of measuring the beat-length of polarization maintain optical fiber based on Sagnac interferometer
Xu Chunjiao, Yang Yuanhong, Duan Weiqian, Yang Wei
2010, 36(6): 753-756.
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The reflectance and transmission spectrum of the hybrid Sagnac fiber optic interferometer which is consist of single mode fiber coupler and polarization maintain optical fiber were investigated and the modulation character of the spectrum was illustrated. A simple measurement method for the beat-len...

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