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2008 Vol. 34, No. 02

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Wing-s optimization design using serial and parallel computations based on N-S equations
Wen Jianhua, Zhu Ziqiang, Wu Zongcheng, Chen Zemin
2008, 34(02): 127-130.
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Abstract:
The serial and parallel flow field solution program was validated at two Mach numbers between 0.7 and 0.9 using both a high and a moderate aspect ratio wings. The result based on the Navier-Stokes(N-S) equations proved it right and the parallel efficiency as well as speed-up ratio was discussed. Wit...
Scheme analysis of pump-valve coordinated control electro-hydrostatic actuator
Qi Haitao, Fu Yongling, Wang Zhanlin
2008, 34(02): 131-134.
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Abstract:
Aiming at the problem of low response which existed in the typical electro-hydrostatic actuator (EHA) systems, control valve was introduced into EHA systems to find a trade-off between efficiency and response. Three schemes of pump-valve coordinated control EHA were put forward. First was EHA with e...
Trajectory optimization design for surface-to-air missile using multilayer approach
Jiang Huan, Zhou Hao, Chen Wanchun, Yang Baokui
2008, 34(02): 135-139.
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A multilayer approach to the midcourse trajectory design for a surface-to-air missile to maximize the kill probability was presented. Three layers were discussed. The first layer represented the midcourse trajectory of the missile, the second layer represented the terminal homing phase, and the thir...
Optimization of multi-mode motion estimation algorithm in H.264
Zhang Jiayi, Luo Xiling, Huang Zhigang
2008, 34(02): 140-143.
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The multi-mode motion estimation algorithm of H.264 standard have the problems of complicated coding mode and much computing. Based on analysis of motion estimation algorithm from H.264-s reference model JM10, an original mode selecting algorithm using time or space relativity and an efficient match...
Novel spaceborne SAR ambiguity echo simulation method
Song Xi, Zhou Yinqing, Chen Jie, Li Chunsheng
2008, 34(02): 144-147.
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Abstract:
The ambiguity-to-signal ratio (ASR) is an important performance requirement for spaceborne synthetic aperture radar (SAR) system. A novel ambiguity echo simulation method for spaceborne SAR was proposed to analysis the impact of the ambiguity on SAR image quality quantitatively. A novel spaceborne S...
Personalized interest modeling on portal based on latent interest semantic description
Wu Jing, Zeng Xiao, Chen Zhenyong, Xiong Zhang
2008, 34(02): 148-152.
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Abstract:
There is a great potential for interest modeling on description and extension as the personalization services enrich the portal. A novel personalization interest model based on latent interest semantic description(PIM-LISD) was proposed. As a finite mixture, it was represented with personalized inte...
Human perceive system of simulative aircraft based on PIDNN
Dong Weijie, Liu Changhua, Song Hua
2008, 34(02): 153-157.
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A control scheme based on proportional integral differential neural network (PIDNN) was proposed to control the highly nonlinear and vulnerable simulative aircraft and sensing system. Firstly, the models of the human perceive system for the simulative aircraft was analyzed and studied, the system fo...
Numerical simulation on flow field and infrared characteristics of chevron nozzles
Huang Hongyan, Wang Qiang
2008, 34(02): 158-161.
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The QUICK and finite volume method, RNG k-ε turbulence model, wall functions, discrete ordinates method (DOM) and the weighted-sum-of-gray-gases model (WSGGM) were employed to solve N-S equation, thermal conduction equation in solid wall and radiation transfer equation. A converging nozzle with chev...
Triangle mesh optimization based on DSI interpolation
Liu Ruigang, Cheng Dan, Yang Qin, Long Xiang
2008, 34(02): 162-166.
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The algorithm of triangle mesh optimization was provided by optimizing situation of the triangle vertices. The situation optimization is based on the discrete smooth interpolation(DSI). The compensated triangles were added to the vertex adjacent to the boundary during interpolation iterative computa...
Optimization of special elliptic orbit constellation for regional coverage
Meng Bo, Han Chao, Huang Weijun
2008, 34(02): 167-170.
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Abstract:
The merit of elliptic orbit was analyzed, and the merit was that elliptic orbit could give a biasing of earth coverage towards a given latitudinal zone or a given region. The method of designing special elliptic orbit which was critical inclined, sun synchronous and repeating ground trace was expoun...
High resolution finite element procedure for compressible flows simulation
Yang Zhongzhou, Lee Chun-Hian
2008, 34(02): 171-174.
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Abstract:
Spatial discretization of N-S equations was first deduced based on the classical Galerkin method. Taking the above semi-discretized formulation as the basic scheme, a diffusion and an associated anti-diffusion terms were then added, keeping the scheme to possess a local extremum diminishing (LED) pr...
Method for static response interval of structures and engineering applications
Xia Yuying, Qiu Zhiping
2008, 34(02): 175-178.
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Abstract:
Aimed at physical and geometrical uncertainties broadly existed in practical engineering, an effective method for the supremum and infimum of the static response of structures with bounded uncertainties was presented. The linear interval equations were changed into two standard linear programming pr...
Heterogeneous data integration and coordination in national geology grid
Guo Haoming, Hao Guoshun
2008, 34(02): 179-182.
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Abstract:
In national geology grid(NGG) environment,applications are developed with distributed geologic data. To facilitate application, a uniform data integration framework should be provided. For geologic application-s characteristics, the data integration systems should focus on maintaining dynamic data r...
Position of rover by UHF communication link on lunar surface
Li Xue, Xu Yong, Wang Ce, Zhang Qishan
2008, 34(02): 183-187.
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To position the rover on lunar precisely, a new approach for ranging and measureing angle at high accuracy was presented by utilzing the ultra high frequency(UHF) communication link between rover and lander. In the position system, direct-sequence spread spectrum(DSSS) and consultative committee for...
Simulation of parachute-s opening process with multi-node model
Pan Xing, Cao Yihua
2008, 34(02): 188-192.
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Multi-node model of canopy and parachute system under axisymmetrical hypothesis was set up according to their structural and mechanics characteristics. Dynamics equations of this model for simulating inflation process of flat circular parachute with no angle of attack have been constructed by consid...
Optimized formation assignment for large-scale air fleet using fuzzy clustering and genetic algorithm
Xiong Wei, Ding Quanxin, Chen Zongji, Zhou Rui
2008, 34(02): 193-196.
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Abstract:
Aiming at the low efficiency, fallibility of formation assignment result and lack of intelligence in optimized formation assignment for large-scale air fleet, a new hybrid genetic fuzzy clustering algorithm (GFCA) was proposed for large-scale air fleet optimized formation assignment by incorporating...
Effects of free stream local disturbance on delta wing aerodynamics
Zuo Linxuan, Wang Jinjun, Liu Yang
2008, 34(02): 197-201.
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Abstract:
The effects of free stream disturbance on micro air vehicle (MAV) aerodynamics was investigated using delta wings with disturbance introduced by an upstream cylinder in wind tunnel. The results indicate that the stall-delay happen when disturbance is introduced in the upstream of apex for both rigid...
Autonomous orbit determination algorithm for constellation from relative position measurements
Chen Pei, Han Chao
2008, 34(02): 202-205.
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Abstract:
The ability of autonomous navigation is one of the key features supporting autonomous operation of the new generation navigation constellations. Autonomous navigation based on relative position measurements among satellites can be described as a high order nonlinear estimation problem, solving such ...
Optimization of energy absorption in high speed fluid-driven mechanism
Chen Weiwei, Sun Lingyu, Zhang Guangyue, Li Fei
2008, 34(02): 206-209.
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Abstract:
For a high speed moving mechanism driven by fluid, abrupt stop resulted from barriers will lead to its large deformation, even fracture. To achieve optimum structural style and parametric matching of buffer members, nine test samples were selected out of twenty-seven design styles through orthogonal...
Integrating design of performance and reliability for flight control systems
Chen Yunxia, Zeng Shengkui, Jin Yanzun
2008, 34(02): 210-214.
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By analyzing and summarizing the achievements and shortages of related research works about integrating design of performance and reliability (IDPaR), the research thought of IDPaR was put forward. From considering the internal and external factors related to product failure, a generic modeling meth...
Comprehensive biomechanical analysis of microcosmic trabecular structure of cancellous bone
Pei Baoqing, Wang Tianmiao, Wang Junqiang
2008, 34(02): 215-218.
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Femoral cancellous bone has microcosmic trabecular structure and its element characteristics effect the gross mechanical property of the femur. Finding proper cell configuration and its distribution will be of great importance for more effective biomechanical analysis of cancellous bone. A lot of mi...
Behavior of silica sol during the anodizing process of magnesium alloy
Li Yihong, Zhu Liqun, Liu Huicong, Chen Yichi
2008, 34(02): 219-223.
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Anodic films were prepared on AZ91D magnesium alloy and Mg-Li alloy separately in 150 g/L NaOH and 1.0 mol/L Na2SiO3 with varied silica sol addition. The conductivity of the solution and the surface morphologies of the anodic films were characterized by conductivity instrument (DDS-307) and scanni...
Design and control of air bearing precision positioning stage driven by linear motors
Zhang Congpeng, Liu Qiang
2008, 34(02): 224-228.
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Abstract:
In order to master the design and control techniques of the workpiece table in photoetching machine, an H-type air bearing precise positioning stage driven by dual linear motors was established. Some key techniques, including design method of air bearing slider and synchronic-motion control of dual ...
Underactuated control of micro-satellite using thrusters based on (w,z) parametrization
Liu Haiying, Wang Huinan, Chen Zhiming
2008, 34(02): 229-233.
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Aimed at the attitude stabilization of micro-satellite under actuator failure, a control scheme based on the (w,z) parametrization was proposed. The (w,z) parametrization is a new attitude describing method, which describes the attitude of satellite using two perpendicular rotations thus complements...
Design real-time traffic information by cell transmission model
Shang Huayan, Huang Haijun, Gao Ziyou
2008, 34(02): 234-238.
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The variable message signs (VMS) have been widely used in guiding and managing the dynamic traffic with development of intelligent transportation technologies.Such traffic dynamics as shock waves and jam can be well reproduced by cell transmission model (CTM). A new method to estimate the route trav...
Key techniques in simulation of machining distortion for aeronautical monolithic component
Zhang Hongwei, Zhang Yidu, Zhao Xiaoci, Wu Qiong
2008, 34(02): 239-243.
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Key techniques in the process of simulating machining distortion in milling due to residual stresses were researched. The calculation program was developed to generate residual stresses file and the finite element model containing original residual stresses was established. The thin-walled structure...
Force distribution of plane 2-DOF overactuated parallel manipulator with fault tolerance
Yan Caixia, He Guangping, Lu Zhen
2008, 34(02): 244-248.
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In order to ensure the fault tolerant capacity of manipulator under scenario the failed actuators are no more than system redundancy, the driving force distribution before and after failure was researched. Based on the D-Alembert principle and the equivalent force theory, a plane 2-DOF(degree of fre...
Parametric design and analysis of front independent suspension of 6×6 off-road vehicle with ADAMS/View
Jiang Libiao, Ni Qiang
2008, 34(02): 249-252.
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Abstract:
Methods of parametric modeling and analysis supplied by ADAMS/View were used to design and analyze front independent suspension of 6×6 off-road vehicle, and better results were received. The whole process is that firstly dimension parameters of suspension were designed according to design conditions...

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