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2007 Vol. 33, No. 06

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Design of target code in human-machine interface
Zeng Qingxin, Zhuang Damin, Ma Yinxiang
2007, 33(06): 631-634.
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Abstract:
An experiment of multitask (monitor, calculation-memory, attack and detection) which simulated the flight control environment with some degree of fidelity was developed. This work investigated how human identify target color, figure and location under different task weight and mental workload levels...
PIV measurements in the wake of coaxial-rotor in water tunnel
Yu Shimei, Deng Yanmin
2007, 33(06): 635-639.
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Abstract:
Particle image velocimetry (PIV) technique was applied to the experiment of coaxial-rotor in hover and in forward flight in water tunnel. The laser sheet was positioned for tip vortices shed at zero and 180 degrees azimuths. The rotor rotation and the imaging system were synchronized to acquire PIV ...
Flutter control of aeroelasticity with freeplay nonlinearity
Li Daochun, Xiang Jinwu
2007, 33(06): 640-643.
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Abstract:
The question of active futter control of prototypical aeroelastic wing section in subsonic uncompressible flow was investigated. The aeroelastic dynamic model with freeplay nonlinearity in pitch was built using Theodorsen quasi-steady aerodynamic force and moment. Then the control law for flutter su...
Analysis and simulation on the dynamic process of the air-blasting device
Wan Yuequan, Wang Shaoping
2007, 33(06): 644-648.
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Abstract:
To meet the need for a safe and effective device to clean the pipelines in the industry area, an air-blasting device was designed. The air-blasting device storages highly compressed air which could be got from air supplier and then, by suddenly releasing the compressed air, the supersonic jet curren...
Design and calculation for the anti-icing system of an aircraft engine let
Chang Shinan, Ai Suxiao, Bi Wenming, Yuan Xiugan
2007, 33(06): 649-652.
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Abstract:
A hot-air anti-icing system for an engine inlet was designed. The engine had a flow distribution plate. Based on the calculation of water droplets trajectories, thermal calculation was conducted for the anti-icing system, including the temperature profile of anti-icing surface, pipes pressure loss a...
Partial-jet-borne flight LQG/LTR robust controller design
Tang Peng, Zhang Shuguang, Jiang Zaiming
2007, 33(06): 653-657.
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Abstract:
A research was done for the problem of the application of integrated flight/propulsion system of the aircraft using LQG/LTR(linear quadratic gaussian/loop transfer recovery) robust design methodology at the partial-jet-borne flight phase. With flying qualities assessed by bandwidth and Gibson criter...
Simulation of elastic-plastic impact with modified smoothed particle hydrodynamics method
Long Liping, Zhang Jianyu, Ding Hua, Fei Binjun
2007, 33(06): 658-662.
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Abstract:
Based on the approximation of smoothed particle hydrodynamics (SPH), the formulations of SPH method, which can numerically simulate the elastic-plastic impact process in solid mechanics, was established. Modified boundary functions were used to simulating the boundary condition. Owing to the tensile...
Numerical calculation of laminar flat plate skin friction
Zhou Dan, Yu Jianjun, Yan Chao
2007, 33(06): 663-667.
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Abstract:
In order to calculate laminar skin friction more accurately, the laminar flat-plate skin friction was calculated by solving the N-S equations. For solving the N-S equations, 4 advanced upwind schemes, 14 different grid distributions and 5 limiters were employed. All the results were compared with Bl...
Spherical panorama creating algorithm based on curve surface mosaic
Li Xiaohui, Zhou Yinqing, Wang Zulin
2007, 33(06): 668-671.
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Abstract:
A novel spherical panorama creating algorithm based on curve surface mosaic was presented to achieve omni-directional scene observation at a fixed viewpoint. The work was concentrated on sphere projection, blank holes elimination, global illumination alignment and image stitching. The horizontal and...
Fast PN code acquisition for DSSS receiver in high dynamic situation
Xu Feng, Shao Dingrong, Li Shujian
2007, 33(06): 672-676.
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Abstract:
For direct sequence spectrum system(DSSS) receiver in high dynamic situation, a fast PN code acquisition method was proposed. The acquisition method based on high-folded digital matched filter(DMF) and FFT is able to convert the traditional two-dimensional search method to one-dimensional search. Th...
Algorithm of decision making for avionic device fault diagnosis
Li Jie, Shen Shituan, Sun Baojiang, Qi Yi
2007, 33(06): 677-681.
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Abstract:
The multiple attribute decision making(MADM) algorithm for fault diagnosis expert system was put forward. The influence of diagnosis decision-making on the diagnosis efficiency was analyzed. According to the effect of every attribute on diagnosis decision-making,the attributes′ value was normalized....
Hybrid FDTD-PWS method for focal field analysis of lens antenna at millimeter-wave band
Zhang Yan, Lü Shanwei, Miao Jungang, Li Yuying
2007, 33(06): 682-685.
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Abstract:
A novel hybrid finite-difference time-domain (FDTD) method and plane wave spectrum (PWS) method was presented for analysis focal field distribution of lens antenna. Firstly, the amplitude and phase distribution in the aperture was simulated by the FDTD method. Moreover, the antenna model was reduced...
Computer vision scheme for autonomous landing of unmanned helicopter on ship deck
Wang Xiaojian, Pan Shunliang, Song Zishan, Shen Weiqun
2007, 33(06): 686-689.
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Abstract:
A computer vision solution based on landing mark for guiding an unmanned helicopter to the ship deck was studied. Factors which limited the pose estimation efficiency were analyzed and a novel information-blocking based image processing method was proposed. With the optional coordinate transformatio...
Path planning method of UAV based on CHC algorithm
Zhang Zhenli, Wang Yingxun
2007, 33(06): 690-693.
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Abstract:
An approach of UAV(unmanned aerial vehicle) path planning based on the improved genetic algorithm CHC(cross generation heterogeneous recombination cataclysmic mutation) algorithm was proposed. The initial population was produced by the searching algorithms containing heuristic information. The fitne...
Effect of digital precision temperature control on FOG IMU performance
Ren Zhuoheng, Song Ningfang, Cui Jiatao
2007, 33(06): 694-697.
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Abstract:
Referring to the object of tactical FOG (fiber-optic gyro) IMU (inertial measurement unit), the relationship between the environmental temperature and its measurement accuracy was analyzed. An applied temperature control method was put forward to bate the interference of external temperature on IMU....
Algorithm for spares optimization of system with multi-items with different life distributions
Long Jun, Kang Rui, Ma Lin, Cheng Hailong
2007, 33(06): 698-700.
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Abstract:
Focusing on the system with multi-items with different life distributions, the Monte Carlo simulation-marginal analysis based algorithm for spares optimization was presented. The Monte Carlo simulation was used in calculating spares supply performance. Based on the spares supply performance, the mar...
Building model and simulation about heat of fiber optical gyroscope
Meng Zhaokui, Cui Jiatao, Du Xinzheng, Yuan Chunfeng
2007, 33(06): 701-704.
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Abstract:
Based on the mathematical discreteness of the heat state equation, a high precision FOG(fiber-optic gyroscope) thermal model was built as system angel. The building course of the system thermal model of the fiber-optic FOG was introduced, including of building structure geometry model, inner heat so...
Analysis of coarseness of edges extracted from borescope images based on wavelet transform
Li Changyou, Ma Qishuang, Yao Hongyu
2007, 33(06): 705-708.
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Abstract:
To recognize whether there existed crack damages in the inner structure of aircraft engine based on the borescope images, a method (that was called coarseness factor) was presented to describe the coarseness of edge curves extracted from the borescope images. The method first decomposed an edge curv...
Design and simulation of integrated flight and propulsion control for post stall maneuvers
Yang Lingyu, Guo liang, Liu Jiarun, Shen Gongzhang
2007, 33(06): 709-713.
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Abstract:
Research on simulation and design of IFPC(integrated flight and propulsion control system ) of super angle of attack maneuver were done for an advanced vectored-thrust aircraft. A new structure of IFPC was put forward. An engine stability control system was designed to enhance engine stability at su...
Micro-structural analysis of three dimensional braided composites with profiled section
Li Diansen, Lu Zixing, Xu Xiaoyan
2007, 33(06): 714-718.
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The fundamental theory of braiding process of three dimensional braided preform with profiled section was described. The movement rules of the carriers in the machine plane and the planar and spatial yarns paths were analyzed systematically based on the preform with square section. The unit models i...
Trot gait and energy consumption simulation of a quadruped robot
Gao Feng, Lei Jingtao, Xu Guoyan
2007, 33(06): 719-722.
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Abstract:
Walking robot carries its own energy source such as battery to walk and finish exploring task, so the research of energy consumption is of great significance. The gait of walking robot has close relationship with energy consumption. Trot gait was adopted to analyze the relationship between energy co...
Quantitative relationship between impact property and dynamic compressive performance of Ti alloy
Cui Dan, Zhang Zhengang, Wu Guoqing, Huang Zheng
2007, 33(06): 723-726.
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To explore the relationship between impact property and cold upsetting finished product ratio of Ti alloy,the effect of microstructure parameter on impact property of Ti-3Al-5Mo-4.5V alloy was investigated systemically with quantitative statistical analysis method. The relationship among crack initi...
Algorithm combined analytical and numerical solutions for robot inverse kinematics
Liu Da, Wang Tianmiao
2007, 33(06): 727-730.
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Abstract:
Aiming at some robot configurations which can′t be resolved by analytical solution, an inverse kinematics algorithm, in which analytical and numerical solutions are combined, was proposed. This algorithm simplified the previous method to search a suitable object function, and then iteratively solved...
Latitude distribution algorithm of cutter position optimization on drum-like cutter for strip-maximization
Li Zhengqiang, Chen Zhitong, Xiao Jun
2007, 33(06): 731-735.
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Abstract:
Based on the theory of the shortest lines, the drum-like cutter was dispersed along the latitude direction convenient for the cutter location and pasture regulation. For global fitting the curvature distribution of the cutter and the surface to be machined, cutter was firstly located to one point at...
Modeling of single track vehicle′s dynamics based on co-simulation
Zhang Hongbing, Ding Nenggen, Wang Hongchen
2007, 33(06): 736-738.
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Abstract:
To investigate the dynamic characteristics of single track vehicles, a driver-vehicle closed-loop co-simulation model was built. The model consists of two parts: a multi-body dynamic model built in Adams and a driver model built in Matlab based on the theory of ′single point preview optimal curvatur...
Key-feature-based clustering algorithm for search engine results
Zhang Hui, Xie Ke, Pang Bin, Wu Hui
2007, 33(06): 739-742.
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Abstract:
To solve the problem that users of web search engines are often forced to sift through the long ordered list of document, a new key-feature clustering (KFC) algorithm was presented to help locate the valuable search results that the users really needed, which was different from VSM. The algorithm fi...
High performance round-robin arbiter for virtual channel router
Zhang Zhe, Gao Xiaopeng, Long Xiang
2007, 33(06): 743-747.
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Two typical virtual-channel router architectures were analyzed, whose switch fabrics were in different scales. The scale of switch fabric was indicated to lay great impact on scheduler and arbiters in the router. Two arbiter architectures were proposed as variations of PPE, a round-robin arbiter. By...
Electronic and optical properties of PbTiO3 cubic phase
Bai Yu, Chen Qiang
2007, 33(06): 748-751.
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Using FP-LAPW (full potential linear augment plane wave) method, the electronic band structure, DOS (density of states), and charge density contours of ferroelectric PbTiO3 bulk in cubic paraelectric phase were calculated with GGA (generalized gradient approximation) exchange correlation. Band struc...
Microscopic study of formation and mechanical properties of amorphous Cu
Wang Guanghai, Pan Hui, Ke Fujiu, Xia Mengfen, Bai Yilong
2007, 33(06): 752-756.
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The microscopic mechanism of the formation and mechanical behavior of amorphous Cu were studied by using molecular dynamics simulation method. The radial distribution function(RDF) and the pair analysis(PA) technique were used to characterize the structure of Cu during solidification. The splitting ...

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