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2005 Vol. 31, No. 04

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Preliminary investigation on detonation wave ignition technique
Guo Hongjie, Liang Guozhu, Ma Bin, Zhang Zhenpen
2005, 31(04): 375-380.
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Abstract:
The relative merits of several ignition techniques of liquid propellant rocket engine were analyzed. The feasibility of each ignition technique applicable to multi-chamber multi-run ignition system of future advanced propulsion system was discussed. The structural configurations of application scena...
CMOS star sensor image acquisition and real-time star centroiding algorithm
Hao Xuetao, Jiang Jie, Zhang Guangjun
2005, 31(04): 381-384.
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Abstract:
Utilizing low power consumption and low-cost development performance of CMOS(complementary metal oxide semiconductor) image sensor technology, a novel CMOS star sensor image collection system was designed. Consisting of FPGA(field programmable gates arrays), SRAM and parallel ports, it can accomplis...
Experimental study of static pressure characteristics at stator surface in a rotor-stator disk cavity
Zhang Chong, Luo Xiang, Xu Guoqiang, Tao Zhi
2005, 31(04): 385-388.
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Abstract:
Radial distribution of the static pressure at stator surface was measured in a rotor-stator disk cavity with centric inflow and two outflows. Cooling air enters at the center of the system and leaves through the holes in the rotor and clearance between rotor and shroud. The influences of disk rotati...
Application of evolutionary strategy of research of static characteristics of liquid propellant rocket engine
Hu Wei, Zhang Zhenpeng, Zhang Lihui
2005, 31(04): 389-392.
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Abstract:
The mathematical models of the static characteristics of the full-flow staged combustion cycle rocket engine were presented. These mathematical models are composed of some non-linear equations. Using the conventional algorithms is very difficult to get to solution. Evolutionary strategy algorithm of...
Investigation of flow instability in rotating cavity with axial throughflow of cooling air
Tian Shuqing, Tao Zhi, Ding Shuiting, Xu Guoqiang
2005, 31(04): 393-396.
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Abstract:
To investigate the instability of flow in rotating cavities, the flow in a heated rotating cavity with cool air axial throughflow was numerically studied, based on the time-independent incompressible equations in rotating system, and low Reynolds K-ε turbulent model. The flows in the cavity, affecte...
Research and implementation of web services composition runtime system
Zhang Yu, Ge Sheng, Sun Hailong, Ma Dianfu
2005, 31(04): 397-401.
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Abstract:
Single web services just provides limited functionality, it can’t provide enough functionalities for practical requirement. In order to solve the integration and collaboration problems of internet applications, it is necessary to compose several web services together to implement complex business lo...
Investigation and enhancement of cut-paste algorithm in overlapping grid
Li Tinghe, Yan Chao, Li Yuejun
2005, 31(04): 402-406.
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Abstract:
To solve the problem in generation of overlapping grids in CFD (computational fluid dynamics) automatically, the main characteristics and basic flow of the newly emerged cut-paste algorithm which generates overlapping grids by cutting and pasting hole fronts were investigated. The promising advantag...
Time domain Neal-Smith criterion and PIO prediction
Ning Guodong, Fang Zhenping
2005, 31(04): 407-411.
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Abstract:
A quantitative criterion named time domain Neal-Smith criterion(TDNS) for the evaluation of pilot-induced oscillations (PIO) tendencies in fixed-wing aircraft has been developed. The criterion is formulated in the time-domain to permit evaluation of flight control nonlinearities without assumption o...
Model for structural fuzzy reliability analysis based on fuzzy random parameter
Wang Lei, Liu Wenting
2005, 31(04): 412-415.
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Abstract:
The research of structural fuzzy reliability theory is to set up a model for structural fuzzy reliability analysis just considering the defining fuzzy safety state. Based on the existed theory for structural fuzzy reliability analysis, a model for structural fuzzy reliability analysis accounting int...
Ergonomics implications of extravehicular activity spacesuit glove
Ding Li, Yang Feng, Yang Chunxin, Yuan Xiugan
2005, 31(04): 416-420.
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Abstract:
For enhancing the work efficiency of extravehicular activity (EVA) spacesuit glove, the main factors of affecting spacesuit gloves on performance were analyzed. The performance would decline quickly if the temperature of finger skin is under 15.6℃, the pressure always have significantly affects the ...
Solution of direct kinematics of 6-DOF parallel manipulators using extra sensors
Pei Baoqing, Han Xianguo, Chen Wuyi
2005, 31(04): 421-424.
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Abstract:
The direct kinematics problem of a 6-DOF parallel manipulator is difficult and there is usually not a unique solution. Different methods of handling the direct kinematics problem were discussed. Two common approaches to find the solution directly are using an iterative numerical procedure or using t...
Orthogonal direction algorithm for global function optimization
He Linshu, Liu Gang
2005, 31(04): 425-429.
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Abstract:
A global optimization algorithm for function optimization named "orthogonal direction algorithm" was raised . This algorithm uses 3 times of large ranged orthogonal design to find the approximate location of the global optimization solution and then uses several times of small ranged orthogonal desi...
Study on corrosion resistance of aircraft conduit connector at simulated service environment
Li Songmei, Liu Jianhua, Sun Zhongzhi, Jiang Weicang
2005, 31(04): 430-433.
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Abstract:
Corrosion resistance, airproof property and oilproof property of aircraft conduit connector of Cd-electroplated 45# steel were studied by a conduit connector corrosion experiment system at simulated service environment. Cd-electroplated 45# steel was placed in the solution of 6% NaCl at 90±5℃ for 5 ...
Flexible adaptive truss testbed and its optimal control experiment for vibration
Zhao Guowei, Huang Hai, Xia Renwei
2005, 31(04): 434-438.
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Abstract:
With dSPACE system and developed piezoelectric ceramic actuators, an adaptive truss shaped as a triangular prism was constructed as a testbed in this work. The first order natural frequency of the truss is as low as 5Hz. With the feedback signals from accelerometers on different locations of the str...
Research and implementation of web services transaction process system
Yin Rui, Ge Sheng, Ma Dianfu
2005, 31(04): 439-442.
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Abstract:
Web services have good interoperation and can efficiently support coordination and integration of software, the process of coordination and composition needs the support of web services transaction to ensure consistent and reliable outcomes. Based on the property, principle and runtime mechanism of ...
Bandwidth allocation for FC-AL under hard real time condition
Lin Qiang, Xiong Huagang, Zhang Qishan
2005, 31(04): 443-446.
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Abstract:
Fibre channel is a computer communication protocol designed to meet many requirements related to the ever increasing demand for high performance information transfer. Arbitrated loop is one of basic fibre channel topology. To guarantee message deadlines for the whole message set, the real-time chara...
High speed and accuracy position measuring method based on inductosyn
Chen Jingquan, Er Lianjie, Liu Zhenghua, Wu Yunjie
2005, 31(04): 447-450.
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Abstract:
Position measurement methods by use of phase detection and amplitude detection based on inductosyns are not suitable for high speed and high accuracy position measurement for the defects of operation principle. To solve the problem of measuring position accurately at high speed, a novel position mea...
XML functional dependency on NXD
Gao Qingyi, Lu Peng
2005, 31(04): 451-454.
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Abstract:
As semi-structured data, XML brings some problems in the normalization of Native XML Database data schema. To solve the problems, the method of combination of xml structure information and xml data information was proposed, and by using this method the concept xml functional dependency was defined. ...
Problems in earth’s equivalent radius method application
Pei Xu, Ma Dongli
2005, 31(04): 455-458.
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Abstract:
To ravel the application range and some noticeable problems of the earth’s equivalent radius method during using this model to simply calculate the atmospheric refraction of radio waves, the mapping relationships of the variables between the earth’s equivalent radius model and the original earth mod...
Simulated test technique for engine air intake and exhaust in high speed wind tunnel
Hao Weidong, Deng Xueying, Qu Fangliang
2005, 31(04): 459-463.
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Abstract:
To study this test technique, the engine simulator(turbine powered simulator, ejectors)and the simulated parameters were analyzed and compared firstly in this paper. The Calculating methods of the ejector were presented using the theoretical base of One-dimensional ideal flow. An engine air intake a...
Study on second-order sliding mode control law for affine nonlinear system
Yang Liman, Li Yunhua, Yuan Haibin
2005, 31(04): 464-467.
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Abstract:
The chattering and robustness issues of the existing sliding mode control especially second-order sliding mode (SOSM) control algorithms were analyzed. Aiming at the problems of slower convergence and stronger chattering in the nearly time-optimal SOSM control law, an improved control method was dev...
Network service performance measurement architecture
Xia Chunhe, Zhu Jianpeng, Pan Honglian, Zhang Cong
2005, 31(04): 468-471.
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Abstract:
Establishing network measurement infrastructure is a key problem in network measurement area. Under the environment of internet, sometimes network service providers and network administrators want to know the quality of their service from the perspective of users, and the users also want to learn wh...
Application of orthopaedic robotics
Hu Lei, Gao Yifei, Wang Tianmiao, Wang Manyi
2005, 31(04): 472-476.
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Abstract:
From the aspect of the application in clinical surgery, the orthopaedic robotics and the robot assisted orthopaedic surgery system were discussed. Considering the clinical characteristics of the orthopaedic surgery and the functionality of orthopaedic robot system in clinical surgery, the orthopaedi...
Numerical investigation of supersonic jet interactions for tactical bodies
Deng Youqi, Yan Chao, Wu Xiaojun, Zheng Ming
2005, 31(04): 477-480.
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Abstract:
In order to investigation of the jet interaction for finned bodies, the interaction between a lateral jet and the supersonic external flow was investigated numerically by solving the N-S equation. To model more exactly the nozzle geometry and resolve the complex flow associated with the lateral jet ...
Algorithm for color image coding based on wavelet zerotree
Yao Yuan, Zhang Xiaolin, Liu Rongke, Zhao Ling
2005, 31(04): 481-484.
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Abstract:
To improve the coding speed of set partitioning in hierarchical trees (SPIHT) algorithm, the structure of SPIHT was re-designed, a simple listless coding algorithm based on wavelet zerotree was developed. Pipeline coding structure was realized by pre-processing and main-processing processes and acce...

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