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2007 Vol. 33, No. 02

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Spacecraft autonomous navigation based on SSUKF algorithm
Liu Yong, Xu Shijie
2007, 33(02): 127-131.
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An improved unscented Kalman filter (UKF) algorithm based on spherical simplex unscented transformation (SSUT) was presented to satisfy the stability, precision and real time requirements of spacecraft autonomous navigation. The S SUT reduces the sigma points for the unscented transformation. Compar...
Curvature effects on the film cooling with the rotation
Tao Zhi, Young Xiaojun, Ding Shuiting, Xu Guoqiang
2007, 33(02): 132-135.
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A computational heat transfer analysis was carried out to comprehend t he mechanism of rotation and the curvature effect on the film cooling which is i mportant in understanding the mixing process between the film coolant and the ho t stream air over the high pressure turbine blades. The CFX code wa...
Continuous and discrete gust responses of elastic missiles
Wu Zhigang, Yang Chao
2007, 33(02): 136-140.
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Elastic missiles in atmosphere may have intense response due to gust e xcitation, which has great influence on structural safety, flight performance, a nd attack precision. Approaches of the calculations of aeroservoelastic response to the continuous and discrete gust for missiles were presented. Th...
Method based on μ-analysis techniques for the clearance of flight control laws
Liu Lin, Chen Zongji, Tang Qiang, Che Jun
2007, 33(02): 141-144.
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The clearance of modern flight control laws to take into account the m any uncertainties has become a great challenge to engineers and researchers, and traditional grid-based methods have gradually been incompetent for this task. A method based on μ-analysis techniques was used to solve this very di...
Optimization for composite wing based on Pareto genetic algorithm
Cheng Wenyuan, Cui Degang
2007, 33(02): 145-148.
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To solve the aileron reversal problem in aircraft design, an aero-elastic tailo ring optimization model of composite wing for engineering requirement was establ i shed and the Pareto genetic algorithm (PGA) based on Pareto optimal set was developed. In order to obtain the Pareto optimal set, the Par...
Design of innovative control surfaces of flying wing aircrafts with large ratio aspect
Ma Chao, Li Lin, Wang Lixin
2007, 33(02): 149-153.
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Because the flying wing aircraft with large aspect ratio cancels the t raditional stabilizers and control surfaces which are used in traditional configur ation, many disadvantages of dynamic characteristic arise. The aerodynamics char acteristic of the innovative control surfaces which are implement...
Acceleration corrosion factor analysis for fatigue critical components based on the Weibull distribution
He Xiaofan, Liu Wenting, Yang Hongyuan
2007, 33(02): 154-158.
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Accounting for the pre-corrosion influence on the fatigue life, the st atistical analysis of acceleration corrosion factor for accelerated aging test to service or natural exposure environment on fatigue critical components was performed. Ass uming the pre-corrosion fatigue life follows the two-para...
Vision-based autonomous landing integrated navigation scheme of unmanned combat aerial vehicles
Chen Lei, Chen Zongji
2007, 33(02): 159-163.
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A computer-vision-based integrated navigation scheme for autonomous la nding of an unmanned combat air vehicle (UCAV) was presented. Based on this sche me, vision information with measurements of other on-board sensors, including i n ertial navigation system (INS) and altimeter system, could be fuse...
Study of active periodical structure′s controlling the direction of reflector electromagnetic wave
Su Donglin, Zhou Yan
2007, 33(02): 164-168.
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The conception of active reflection was presented. Using th e periodical surface′s character of band gap and impedance transition of electr omagnetic crystal structure such as photonic band gap(PBG), frequency selection surface(FSS), high impedance surface(HIS) and so on, the varactor diode was p ut...
New method of ATI moving targets indication based on amplitude and phase thresholds
Yuan Hao, Zhou Yinqing, Li Jingwen
2007, 33(02): 169-175.
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The factors, which influence the distribution of the amplitude and pha se of the points in the phase interferogram of SAR-ATI moving targets indicatio n , including radar-noise, scatter energy, background uneven RCS and the side lob e of image pixels were analyzed. To resolve the problem of the high...
Optimum design of erecting system
Li Zhongming, Jiao Zongxia, Wang Kejun
2007, 33(02): 176-179.
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Optimum design of erecting system was analyzed from the points of view of rapidity and acting force, and the objective function of optimization wa s established. Each objective function was nondimensionalized, and the multiobje ctive optimization function was solved by conventional weighting method....
Dynamic target assignment method based on multi-agent decentralized cooperative auction
Liao Mo, Chen Zongji
2007, 33(02): 180-183.
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The multi-UAV(uninhabited aerial vehicle) cooperative target assignment problem is to decide which UAV attack which target so as to improve efficiency and reduce cost. The mathem atic model for multi-UAV cooperative target assignment problem was built. Assigning targets in multi-UAVs, the model cons...
Nonlinear filter algorithm for GPS/DR integrated positioning
Liu Xu, Zhang Qishan, Yang Dongkai
2007, 33(02): 184-187.
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A filter model and its algorithm based on UKF (unscented Kalman filter) for GPS/DR (global positioning system/dead reckoning) integrated positioning in land vehicle navigation system were established. Aiming at the system characteristic of linear state equation and nonlinear measurement equation, th...
Dexterous workspace analysis of surgical robot
Liu Da, Wang Tianmiao
2007, 33(02): 188-191.
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Although it is difficult for surgical robot to have full dexterous workspace, surgical robot must have high dexterity orienting to minimally invas ive surgery. Firstly, according to the practical requirement of surgery, quadran t segmentation principle was proposed. The surgical workspace was divide...
Complex engineering system synthesis design optimization framework
Wang Zhenhua, Deng Jiati, Sui Pengfei, Wang Yongpo
2007, 33(02): 192-196.
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Synthesis design optimization environment was built for system integration, proc ess unification, parameter optimization and collaborative design. The high exten sible and multi-tiered architecture of this environment was built on the analysis of characteristic of complex engineering system. Four ke...
Core process skeleton based process planning during the early stage of product development
Wei Li, Zheng Lianyu
2007, 33(02): 197-200.
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The early stage of product development has a crucial effect on capabil ity, cost and quality of products. Research on theory and approach of early proc ess planning was based on feature information, and could not utilize rough-gra n ularity incomplete product information. Therefore, core process ske...
Optimization of loading trajectory in skin stretch forming process
Zhang Yanmin, Zhou Xianbin
2007, 33(02): 201-205.
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The influence of loading trajectory was discussed to solve the precisi on forming problem of double curve skin in stretch forming. The method of combin g finite element analysis and optimization algorithms was proposed to acquire th e reasonable loading trajectory. Characteristic and insufficiency o...
Influence of Bauschinger effect on springback in sheet metal stretch bending
Du Song
2007, 33(02): 206-209.
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To theoretically investigate the influence of Bauschinger effect on sp ringback in sheet metal stretch bending, the constitution relation of a kinemati c hardening was used to determine the stress distributions of stretch bending b y numerical calculation, so that the springback was calculated. They...
Auto-adapted fitting algorithm of B-spline surface objects
Chen Guozhen, Liu Jinghua
2007, 33(02): 210-213.
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In view of the reappearance of complex curved surface object in virtua l environment, the control apexes of the surface were fast calculated based on th e known points taken from the curved surface. The control apexes and pitch-poin t vector determined a B-spline curved surface, named the real objec...
Design technique based on CDD function for industrial CT system
Wei Dongbo, Fu Jian, Li Bing, Zhang Lei
2007, 33(02): 214-218.
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Industrial computed tomography(ICT) is an advanced, non-contact and non-destructive testing method. It is complicated, non-universal and expe ns ive. It is necessary to make the custom development to reduce the risk and the c ost. A kind of design technique frame based on the contrast-detail-dose(CD...
Fast selective algorithm of Intra prediction for H.264/AVC
Meng Qinglei, Yao Chunlian, Song Jianbin, Li Wei
2007, 33(02): 219-223.
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The newest video coding standard H.264/AVC provides several predic ting modes and directions for Intra prediction in the spatial region, and the op timal mode was selected by rate-distortion optimization(RDO) with high coding c omplexity. In order to solve this problem, the fast selection algorithm ...
Design and realization of BHU facial expression database
Xue Yuli, Mao Xia, Zhang Fan
2007, 33(02): 224-228.
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A comprehensive facial expression database was provided, which incl udes three kinds of facial expressions: pure facial expressions, mixed facial ex pressions and complex facial expressions. The database contains some unique emot ional facial expressions not appeared in other facial databases, and i...
Image fusion algorithm based on multiscale edges
Li Xiaojuan, Zhao Wei
2007, 33(02): 229-232.
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An image fusion algorithm just using multiscale edges of original imag es was proposed. There are three steps in this algorithm. Firstly, multiscale ed g es of the original images were detected. Secondly, these multiscale edges were fus ed to get the fusion image′s multiscale edges according to the ...
Design and implementation of global content management system
Wu Guoshi, He Suoju
2007, 33(02): 233-237.
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The algorithms of "change detection for database content" and "change detecti on for file" were put forward for detecting the change of client con tent data based on the actuality of multilingual contents in the enterprises. An effectively centralized multilingual content management system was desig...
Wide area oriented network active publish/subscribe system design framework
Gao Qingyi, Lu Peng, Lin Xuelian, Wang Bin
2007, 33(02): 238-242.
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Event space partition technology changes the traditional basic interaction model of the content-based publish/subscribe system and its related implementation strategies, and enables a class of system which is named active publish/subscribe system. In order to establish the integrity of active publis...
Method of enterprise knowledge integration based on semantic web
Gu Wendong, Xia Guoping, You Weijia
2007, 33(02): 243-247.
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In most of today′s enterprises, organization knowledge is located in separate operation systems, therefore the knowledge management is not well realized. Based on enterprise′s legacy systems, an application framework which supports the EKI(enterprise knowledge integration) by applying semantic web t...
Formal models of UML statechart diagrams based on Petri nets
Guo Feng, Yao Shuzhen
2007, 33(02): 248-252.
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A formal model named SC_Net which can precisely describe the dynamic features of UML statechart diagrams was presented. Firstly a formal syntactic of UML statechart diagrams was given and a series of auxiliary functions to describe the structure features of UML statechart diagrams were presented in ...

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