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2006 Vol. 32, No. 07

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Three dimensional turbulence numerical simulation of rotor in forward flight
Yu Ziwen, Cao Yihua
2006, 32(07): 751-755.
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The flow field and performance of a helicopter in common forward flight and forward flight near the ground were analyzed using CFD (computational fluid dynamics) technique. The general governing equations of turbulent flow were set up, and were directly solved by finite volume method and SIMPLER (se...
Position and pose estimation by celestial observation for lunar rovers
Ning Xiaolin, Fang Jiancheng
2006, 32(07): 756-759.
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Abstract:
At a given time the altitude and azimuth of celestial bodies measured by star sensor and other celestial body measure devices contain the information of lunar rover’s position and pose. So the position and pose of lunar rovers can be determined using this kind of information. A new autonomous positi...
Analysis of nonstationary random vibration data during lift-off
Yuan Hongjie, Tang Huan, Jiang Tongmin
2006, 32(07): 760-763.
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Abstract:
The locally stationary parametric model was established to analyze the nonstationary random vibration environment of aircraft during lift-off. The computation of a time-varying spectrum was decomposed into two separate operations, one to define the time-varying mean square value of the signal, and t...
New algorithm of solving for ranges during final approach of spacecraft rendezvous
Zhu Renzhang, Lin Yan, Zhang Lei
2006, 32(07): 764-768.
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Abstract:
A new algorithm of solving for ranges during the final translation phase of spacecraft rendezvous and docking using computer vision system was presented to determine relative attitude and position between target and chase spacecraft by Quaternion Estimation. In this algorithm for ranges, a weighted ...
Investigation of random error model for fiber optic gyroscope
Wang Xinlong, Du Yu, Ding Yangbin
2006, 32(07): 769-772.
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Abstract:
The performance of gyroscope decides the accuracy of inertial reference system. In order to diminish the error of the gyroscope and to improve its precision, the gyroscope′s error model was accurately founded. Methods of PSD(power spectrum density), ARMA, and Allan variance were federally used to st...
Precise research on stellar horizon atmospheric refraction model
Hu Jing, Yang Bo
2006, 32(07): 773-777.
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The concept of stellar horizon atmospheric refraction is considered to be one of the most promising concepts for satellite autonomous navigation. However, the precision of the method is limited due to the uncertainty of the stellar horizon atmospheric refraction model. According to the rule that atm...
Numerical thermal analysis for leaded surface mounted plastic package
Gao Hongxia, Yu Jianzu, Xie Yongqi
2006, 32(07): 778-782.
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The numerical detailed model and compact model were created for plastic quad flat package(PQFP), and the accuracy of two models was verified by the measurement values. The steady thermal performance of PQFP was studied under harsh environment, and factors effecting on the inner and outer thermal res...
Fault detection for inertial measurement unit based on local approach
Xiong Kai, Zhang Hongyue
2006, 32(07): 783-787.
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The application of local approach for fault detection in stochastic dynamic systems was presented. It was demonstrated that the selection of samples numbers plays an important role in improving the performance of the local approach. And it was pointed out that by enlarging the number of samples, the...
Dynamic routing algorithm for LEO/MEO double-layered satellite networks
Yuan Zhe, Zhang Jun, Liu Zhongkan
2006, 32(07): 788-792.
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Double-Layered satellite networks consisting of LEO(low earth orbit) and MEO(medium earth orbit) satellites have advantages on networking and communication performances. Based on the advantages of MEO and LEO satellites in long-distance and short-distance communications respectively, a hierarchical ...
Robust human-imitating intelligent control for a class of nonlinear systems
Liao Daozheng, Zhang Minglian
2006, 32(07): 793-796.
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A robust human-imitating intelligent control was proposed for nonlinear systems. Firstly, a human-imitating qualitative control law was developed through the analyses of the physical model of the plant. The qualitative control law was quantified by some method of parameter-optimization based on the ...
Design and implementation of GPS ground-based regional integrity monitoring system for China civil aviation
Zhu Yanbo, Zhang Xiaolin, Xue Rui, Zhang Miaoyan
2006, 32(07): 797-801.
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A GPS(global positioning system) GRIMS(ground-based regional integrity monitoring system) was established by considering the particularities of Chinese terrain and the distribution of air traffic flow. A ground-based monitoring network composed of 7 monitoring stations gathered data of all GPS satel...
Implementation of low ripple switching power amplifier for magnetically suspended flywheel system
Zhang Liang, Fang Jiancheng
2006, 32(07): 802-806.
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Abstract:
To reduce the ripple current of standard two-level pulse width modulation (PWM) switching power amplifier for magnetically suspended flywheel system, a novel three-level PWM switching power amplifier was proposed. The ripple current of the switching power amplifier using two different PWM techniques...
Interferometric signal simulation based on fractal modeling
Chen Yihong, Yuan Yunneng
2006, 32(07): 807-810.
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INSAR (interferometric synthetic aperture radar) signal simulation methods were investigated deeply, and the fundamental principle of the INSAR simulation was presented. Various noise interference factors in INSAR images were analyzed. The simulation model of the INSAR system was discussed in detail...
Implementation of IF signal processing in GPS satellite signal simulator
Li Baozhu, Zhang Qishan, Yang Dongkai
2006, 32(07): 811-814.
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With the technique of software radio in digital interpolation, digital filtering, A/D(analog/digital) converter, a mathematic model for signal processing of digital IF(intermediate frequency) in the GPS satellite signal simulator was established, and the approaches achieving the practical hardware d...
Near-field three-dimensional radar synthetic aperture imaging based on stolt interpolation
Li Liang, Miao Jungang, Jiang Yuesong
2006, 32(07): 815-818.
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A fully 3-D image-reconstruction algorithm that quasi-monostatic mode is used and the transmitting antenna works in step frequency was developed.The algorithm is not restricted by far field as the traditional imaging algorithm. Through synthetic aperture processing for radar data, the resolutions of...
Development of teleoperation testing system for Stewart platform
Wu Qiang, Wang Zhanlin, Li Jia
2006, 32(07): 819-822.
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Teleoperation testing system for Stewart platform was developed to study Stewart platform teleoperation stability under condition of large time delay. Ethernet was used to simulate the telecommunication channel, which linked two Stewart platforms control systems. DirectX technology was used to build...
Use of aqueous organic silicone hydrophobic agent for hydrophobic treatment of A3 steel
Yang Chunmei, Zhu Liqun, Chen Yichi
2006, 32(07): 823-827.
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An aqueous organic silicone hydrophobic agent which was based on the matrix of a commercially available silicone emulsion and was prepared in the presence of a metal salt catalyst and a water soluble corrosion inhibitor of alcoholamine modified phytic acid was applied to treat A3 steel specimen. Fac...
Finite element prediction of elastic properties of three dimensional and four directional braided composites
Li Diansen, Lu Zixing, Lin Xiaoming, Lu Wenshu
2006, 32(07): 828-832.
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A new finite element solid model was established based on the unit cell model of 4-step rectangular three-dimensional braided composites and the assumption of the yarns with the hexagonal cross-section. The surface of model is parallel to the surface of perform, which coincides with the actual confi...
Numerical simulation of laser welding in combustion chamber case shell on aeroengine
Wang Su, Wang Chunxia, Guo Jungang
2006, 32(07): 833-837.
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Abstract:
A numerical analysis modeling was created about the case shell on aeroengine combustion chamber, which is one of the crucial parts of the aeroengine, during the process of laser welding. Welding deformation due to circumferential welds at the joint between the two cylindrical shells was studied usin...
Interval analysis for free vibration of composite laminated beams
Qiu Zhiping, Qiu Wei, Wang Xiaojun
2006, 32(07): 838-842.
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Abstract:
A new method named interval analysis method, which solves the free vibration of composite laminated beams with uncertain parameters, was presented. Based on interval mathematics and Taylor series expansion, uncertain parameters were described by interval numbers. Instead of conventional probabilisti...
Modeling and control implementation of virtual maintenance simulation
Zhou Dong
2006, 32(07): 843-846.
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It is insufficient to describe maintenance process and relevant resources with existing modeling technique, and existing methods are deficient to combine the expression of maintenance task and maintenance action simulation. Therefore, MTN (maintenance task net) was proposed in order to solve the int...
Mobility behavior for driving bubble traversing constricted capillary tubes
Cao Yu, Zhang Zuoguang, Zhao Weijuan
2006, 32(07): 847-851.
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Constricted capillary tubes were used in order to study bubble mobility condition in composite material during cure processing. The effects of bubble length, radius of capillary tube and the variety of liquid on the drive critical condition of a single bubble traversing through a joint of flow chann...
Direct position analysis of nine-link Barranov truss based on Dixon resultants
Wang Pin, Liao Qizheng, Wei Shimin, Zhuang Yufeng
2006, 32(07): 852-855.
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The assembly configurations of a kind of non-planar nine-link Barranov truss were analyzed by using Dixon's resultants. Four equations were established for the four loops of the mechanism by using vector method and they were changed into complex exponent numbers form. Dixon method was adopted to con...
Optimal design of parallel mechanisms with large tilting ability based on redundant actuation
Bai Zhifu, Han Xianguo, Chen Wuyi
2006, 32(07): 856-859.
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Abstract:
Orientation space of parallel mechanisms was analyzed. Physical constraints and singular constraints are the two main reasons which restrict the orientation ability of parallel mechanisms. The corresponding solutions from the two aspects were presented. New joints and redundant active UPS(universal ...
Comparison of multi-objective optimization methods on engineering design
Zheng Yuntao, Fang Jie, Cai Guobiao
2006, 32(07): 860-864.
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Several multi-objective optimization methods in common use were concluded. In two examples of bi-objective optimization for cantilever beam and rocket engine, linear weighted method and gradual easy constraint method and neighborhood cultivation genetic algorithm(NCGA) method were used to obtain Par...
Design of content-based video retrieval system using MPEG-7
Xue Ling, Li Chao, Xiong Zhang
2006, 32(07): 865-868.
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A content-based film video retrieval system named SupEye using MPEG-7(multimedia content description interface) was designed, which consisted of three parts: feature extraction, data storage and feature retrieval. The part of feature extraction took charge of the extraction of video features and vid...
Identity-based authentication scheme for mobile ad hoc networks
Chen Wei, Long Xiang, Gao Xiaopeng
2006, 32(07): 869-872.
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In order to realize secure and efficient mobile node authentication in mobile ad hoc networks (MANET) which have no traditional public key infrastructure (PKI), a scheme consisting of identity-based cryptograph, distributed secrete sharing algorithm and elliptic curves encryption was proposed. Ident...
New model for token role-based access control on enterprise portal
Zhu Xiaojie, Xiong Zhang, Wu Jing
2006, 32(07): 873-876.
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Abstract:
Manage users and access rights are a complex and challengeable job in enterprise portal. Importing the role concept may simplify the access control, but its implementation is usually constrained by the single system and application. A new model,TRBAC(token role-based access control), was proposed fo...

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