2009 Vol. 35, No. 6

Display Method:
Fast data fusion method for MGNC integrated navigation system
Sheng Wei, Tan Liwei
2009, 35(6): 657-660.
Abstract:
To reduce the computation time of the integrated navigation, an improved algorithm was proposed without model state vector reduction for the micro guidance navigation and control (MGNC) system. The direction cosine matrix was deserved by iterative computation instead of using quaternion as an interm...
Lateral-directional flying quality characteristics of high aspect-ratio combat flying wings
Li Lin, Wang Lixin
2009, 35(6): 661-664.
Abstract:
The roll and yaw axes flying qualities of high aspect-ratio combat flying wings were assessed, based on MIL-STD-1797A. With the adjustment and improvement provided by the proper-designed flight control system, the closed-loop dynamic response characteristics of flying wings, such as roll mode, spira...
Mathematical model of small diameter condenser pipes
Bai Lizhan, Lin Guiping
2009, 35(6): 665-668.
Abstract:
Based on the annular flow pattern, the mathematical model of condenser pipes with small diameters was established. The effect of surface tension on the liquid/vapor interface causing the pressure difference between liquid and vapor phases on the same cross section and the interaction between the liq...
Disturbance observer based on angular acceleration for gyro gimbal servo system
Xu Xiangbo, Fang Jiancheng
2009, 35(6): 669-672.
Abstract:
Magnetically suspended control moment gyro (MSCMG) is the primary attitude actuator of large spacecraft, and the MSCMG gimbal servo system control precision is one of the main factors which affect gyroscopic torque accuracy. In order to enhance the MSCMG gimbal servo system disturbance suppression a...
Genetic algorithm-based decomposition method for multidisciplinary design optimization
Chen Yunxia, Gao Jieping, Xia Huafeng, Zeng Shengkui
2009, 35(6): 673-677.
Abstract:
Based on the analyzing of current methods of solving task decomposition problem in MDO, such as enumerate algorithm, clustering identification method, branch and bound method(BBM), their disadvantages were pointed out. Then, the description and detailed flow were delivered. The advantages of GA were...
Novel optimized implementation of CABAC hardware encoder
Wang Rui, Jiang Hongxu, Li Bo
2009, 35(6): 678-682.
Abstract:
To improve the throughput of hardware architecture for CABAC(context-based adaptive binary arithmetic coder), the optimization methods based on dynamic properties of dataflow were adopted. By building the dataflow model of CABAC algorithm, four inevitable loops brought by hardware implementation wer...
Numerical simulation of dual shear coaxial gas-gas injector
Du Zhenggang, Gao Yushan, Li Mao, Cai Guobiao
2009, 35(6): 683-686.
Abstract:
The turbulent Navier-Stokes equations in combination with the two equation k-ε turbulence model were used to simulate the flowfield in chambers of dual shear coaxial injector which the gaseous oxygen and hydrogen were used as propellants. The results of investigation display that: compared with trad...
Lazy-substitution based symbolic execution for C programs
Lin Mengxiang, Chen Yinli, Chen Rui, Zhou Gang
2009, 35(6): 687-691.
Abstract:
Lazy-substitution based symbolic execution was presented in order to address the computed memory location problem in traditional symbolic execution. A form of lazy strategy was introduced into traditional symbolic execution, which substitutes program variables with their symbolic values as much as p...
Icing simulation and evaluation of AEDC method
Chang Shinan, Hong Haihua, Zhang Yuzhu
2009, 35(6): 692-696.
Abstract:
The arnold engineering development center (AEDC) icing scaling method was introduced and validated through numerical simulation. By icing modeling software, icing numerical simulations were performed for NACA0012 airfoil and its 1/2 and 1/3 scale models, cylinder and its 1/2 scale model. Flow field,...
Modeling of active vibration isolation module with finite element method
Gao Yanlei, Li Lin
2009, 35(6): 697-700.
Abstract:
Aiming at the design of the active micro-vibration control platform with large payloads at low frequency, one kind of the active vibration control platform using modularity design was proposed, which showed the characteristics of the strong carrying capacity and high isolation precision. Modularity ...
Fuzzy tuning Stribeck model and its application on flight motion simulator control
Fu Yongling, Niu Jianjun, Wang Yan
2009, 35(6): 701-704.
Abstract:
New approach combined with friction lead compensation based on Stribeck equivalent control voltage model with its parameters fuzzy tuning and proportion integral differential(PID) control was presented to enhance the control traits of a middle axis driven by servo valve control hydraulic motor for a...
Reentry trajectory design of low lift-to-drag ( L/D ) ratio spacecraft based on predictor-corrector method
Li Huifeng, Ling Yuan
2009, 35(6): 705-708.
Abstract:
To solve trajectory designing problem of the low lift-to-drag ( L/D ) ratio spacecraft when reentering into atmosphere with high speed, a predict guidance method was proposed, based on numerical predictor-corrector (NPC). The independent variable was changed to time instead of energy in order to avo...
Cost efficiency analysis of attack UCAV
Wei Jinzhong, Wang Guangyao, Gu Songfen
2009, 35(6): 709-713.
Abstract:
The uninhabited combat aerial vehicle (UCAV) has its special characters of high stealth,high maneuverability, unmanned, and low life circle cost etc. Considering the features of the UCAV, and utilizing the method used in the modern aircraft cost efficiency analysis, the relationship between the main...
Valence electron structure analysis of property differences between MoO2 and NiMo compounds
Lu Xiaofeng, Wang Huaming
2009, 35(6): 714-717.
Abstract:
Valence electron structures of NiMo and MoO2 compounds in a MoO2-strengthened γ /NiMo alloy were analyzed by a bond length difference method on the basis of Yu’s Empirical electron theory of solids and molecules. Relationships between hardness, strength and melting point differences of the two compo...
Influence of chordwise bending stiffness on aeroelastic characteristics of flexible high-aspect-ratio wing
Leng Jiazhen, Xie Changchuan, Yang Chao
2009, 35(6): 718-722.
Abstract:
High-aspect-ratio wing with low sweepback has been widely adopted by high-altitude long-endurance (HALE) aircrafts, and the wing boasts large deformation due to flight load. The coupling of stiffness between chordewise bending and torsion is intensified by the geometric nonlinearity, and chordwise b...
Application of software requirement error pattern based on ontology
Hu Xuan, Liu Bin, Wang Yichen, Jiang Chongwu
2009, 35(6): 723-727.
Abstract:
The software error pattern concept was presented and the pattern orthogonal attributes, documentation and requirement error pattern production model were given. The domain-related requirement error pattern was described through ontology and the direct scenario of them primarily was analyzed. Direct ...
Transfer alignment of strapdown inertial navigation systems on rolling bases
Wang Xinlong, Shen Liangliang, Ma Shan
2009, 35(6): 728-731.
Abstract:
In the process of initial alignment for rolling bases, the accuracy of a model and the observability and observability degree of states are important facts to confirm the filtering effect. A fast and precise alignment method for rolling bases was discussed. Considering time-delay between the master ...
ElGamal type threshold digital signature scheme for Ad hoc networks
Hu Ronglei, Zhang Qishan, Liu Jianwei
2009, 35(6): 732-736.
Abstract:
ElGamal type threshold signature is an important part of threshold signature. There exists a problem in the ElGamal type threshold signature proposed before that all signer must generate corporately a random number before threshold signature is executed. The computation and communication overhead of...
Effect and mechanism of lift-enhancement of the co-flow jet technology
Liu Peiqing, Kuang Jianmin, Qu Qiulin
2009, 35(6): 737-740.
Abstract:
The effect and mechanism of lift-enhancement of the co-flow jet technology was investigated by numerically simulating the flow around a co-flow jet airfoil. The Farve-averaged Navier-Stokes equation of unsteady compressible flow and the S-A turbulence model were solved by Fluent software. The result...
Accurate tool calibration for robotic conformance grinding system
Wang Wei, Yun Chao, Sun Kun, Wang Yuanyuan
2009, 35(6): 741-746.
Abstract:
An experimental grinding tool calibration method was proposed to improve the accuracy of robotic belt grinding system. The accuracy of grinding tool-s horizontal axis calibrated by this new method is 0.05°. If the tool frame has a deflexion from the programmed pose, this deflexion is trigonometric...
Design for repeater system with wideband and high sensitivity used in pilotless helicopter
Chang Xiaoming, Zhang Xiaolin, Bao Junhai, Liu Chunhui
2009, 35(6): 747-752.
Abstract:
UAV (unmanned aircraft vehicle) is a popular platform of the world-s most advanced technology. A scheme was proposed that can be applied to the ultra short wave relay on the pilotless helicopter, and the system-s design, overall structure, working process of the system were explained, as well as the...
Coverage control protocol using multi-intersection estimation for wireless sensor networks
Zhang Shuo, Liu Yuheng, Pu Juhua, Xiong Zhang
2009, 35(6): 753-757.
Abstract:
In order to prolong the lifetime of wireless sensor networks(WSNs) while maintaining the required sensing coverage quality, a distributed control protocol which determines the redundant nodes in a necessary and sufficient condition was proposed. The protocol using MIER(multi-intersection estimation ...
Characteristic analysis of the vortex in the flow past a circular cylinder
Dong Shuangling, Wu Songping
2009, 35(6): 758-761.
Abstract:
In low-Reynolds-number flow past circular cylinder,the shape of vortices in the vortex street is not ideally axisymmetric,and changes with the the flow downstream. To solve the problem,finite element method was used to simulate the flow and the character of the vortex shape was analyzed by vorticity...
Cross-layer approach to allow MIMO-SDMA in WLAN
Chen Shengbo, Chen Wei, Liu Xuming
2009, 35(6): 762-765.
Abstract:
Multiple input multiple output (MIMO), as an important technology to enhance the physical layer capability, can achieve this target via spatial reuse. An medium access control(MAC) protocol was proposed for uplink transmissions in WLAN, where both stations and access point(AP) were equipped with mul...
Comparative studies of interior ballistic performance among several missile eject power systems
Rui Shouzhen, Xing Yuming
2009, 35(6): 766-770.
Abstract:
Characteristics of several missile eject power systems were introduced and compared. The interior ballistic models of these power systems were designed on the basis of assumed conditions. And the programs were work out to predict and compare the interior ballistic performance about a certain missile...
Business end programming approach based on Bayesian network
Xing Shaomin, Zhou Bosheng, Chen Tianying
2009, 35(6): 771-774.
Abstract:
Existing business end programming methods lack guidance for end-users without development experience. So a business end programming approach based on Bayesian network was proposed. First, a basic framework based on Bayesian network for end-users programming was presented. Then the domain expert syst...
ESSPI non-destructive testing of honeycomb sandwich panel for bonding defects
Luan Xu, Liang Jun, Cheng Jin, Wang Chao
2009, 35(6): 775-778.
Abstract:
Bonding defects of the honeycomb sandwich panel reduced its strength greatly, thus the application in aeronautics and astronavigation was influenced seriously. The basic principles of electronic speckle shearing pattern interferometry (ESSPI) were introduced. Using ESSPI technique and thermal loadin...
Effect of different clapboards structure in turbine blade trailing edge complex passages on flow characteristics
Ding Shuiting, Li Guo, Li Li, Wang Yong
2009, 35(6): 779-782.
Abstract:
The experiment mainly conducted the effect of two different structure diaphragm plates in the complex passages on heat transfer of turbine blade trailing edge. A laser bean irradiated the passages and a low-motion vidicon screened the particle-s flow in second pass passage. Comparison the flow was m...