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2011 Vol. 37, No. 2

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Prototype SMA actuated locking device for small space magnetic bearing flywheels
Yan Xiaojun, Zhang Xiaoyong, Nie Jingxu, Zhang Shaowei
2011, 37(2): 127-131.
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Based on magnetic levitation principle, the magnetic bearing flywheel is a new type of inertial actuator used in satellite attitude control. A locking device was used to eliminate the gap between the rotor and stator of magnetic bearing flywheel so as to protect it from shock and vibration damage du...
Direct reaching sliding mode control
Jiang Yuxian, Zhou Yinqiang, Zhao Xia
2011, 37(2): 132-135.
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Abstract:
Sliding mode control(SMC) system synthesized by traditional reaching condition can not grantee all phase trajectories from the neighborhood of the sliding mode to direct reach the nearby sliding mode branch. It will cause the state transition to be slow and overshooting which are not allowed in some...
In-orbit spacecraft-s earth and atmosphere radiation environment analysis
Yuan Yukai, Chen Hongyu, Wu Huiying
2011, 37(2): 136-139.
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To provide quantitative reference for related space mission analysis, the remote sensing the earth and atmosphere radiation (EAR) simplified model was proposed. A universal irradiation model that suited for most kinds of spacecraft orbit was introduced, which reduced different orbit scenarios to dif...
Application of H∞ theory in electro-hydraulic loading system of helicopter pitch adjusting booster
Liu Guojian, Li Yunhua, Zheng Qi, Guo Zhongwei
2011, 37(2): 140-143.
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A dynamic model of electric-hydraulic loading system was established based on the principle analysis of electro-hydraulic load simulator, which was applied to the earth-experiment of hydraulic assistor for the helicopter pitch adjusting. Controllers designed by conventional control theory were not e...
Identification method of tool wear based on empirical mode decomposition and least squares support vector machine
Guan Shan, Wang Longshan, Nie Peng
2011, 37(2): 144-148.
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In view of the non-stationary characteristics of acoustic emission signal of tool wear, and the slow convergence rate of learning algorithm and easily dropping into the local minimum value for back propagation neural networks, a novel method of tool wear state identification based on empirical mode ...
Software reliability growth model with S-shaped testing effort function
Li Qiuying, Li Haifeng, Lu Minyan, Wang Xuecheng
2011, 37(2): 149-154,160.
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Abstract:
The shape of the observed reliability growth curve depends strongly on the time distribution of the testing effort. Thus, the reliability estimation power of software reliability growth model (SRGM) can be improved by considering the testing effort function (TEF). Due to the integrated effects of so...
Multi-dimensional state space model to aircraft-deck landing safety
Tian Jin, Zhao Tingdi
2011, 37(2): 155-160.
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There are lots of factors from human, machine and environment involved in aircraft-deck landing process, and the factors show multivariable nonlinearity and strong coupling, which brings some difficulty to real-time and effective safety monitoring, identification and decision-making to aircraft-deck...
Design optimization and simulation of mechanical anti-load simulator
Wang Wei, Li Xiongfeng, Zhang Xinhua, Yu Wenpeng
2011, 37(2): 161-166.
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The dynamics and extraneous torques models of an anti-load simulator were built according to the complex vector and virtual displacement principles respectively. To avoid the problem that the solution is not consistent when the traditional genetic algorithm (GA) is used in the parameters optimizatio...
Design of sliding model and dynamic inverse control law for a missile based on RBF neural-networks
Yang Zhifeng, Lei Humin, Li Qingliang, Li Jiong
2011, 37(2): 167-170.
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A radial basic function (RBF) neural networks based sliding model control and dynamic inverse control approach to a missile was presented. The basic control law was designed by dynamic inversion, and neural networks based sliding model and dynamic inverse controller was designed for the slow loop to...
Net barrier strength and performance evaluation of AAS by FE method
Deng Ying, Yan Xiaojun, Zhang Hui
2011, 37(2): 171-174.
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The performance of aircraft arresting system (AAS) and strength of net barrier was evaluated by means of nonlinear finite element (FE), considering contact, net mass and material properties. Key problems, such as FE model, boundary condition and numerical convergence caused by complex nonlinear syst...
Analysis for whole airspace flight key factors of unmanned aerial vehicles
Cai Zhihao, Yang Liman, Wang Yingxun, Li Xinjun
2011, 37(2): 175-179,184.
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Abstract:
Aiming at the problem of unmanned aerial Vehicles(UAVs) entering non-segregated airspace, UAVs-safety and the key factors of improving their airspace flight capacity were analyzed, according to the characteristics of large scale, medium scale, small scale and low speed, medium speed, high speed UAVs...
Internal charging protection technology of typical space polymer dielectric material
Wang Jinfeng, Zheng Xiaoquan, Li Shengtao, Bai Jingjing
2011, 37(2): 180-184.
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Abstract:
Besides efficient shield,the best method for eliminating the pulsed discharge induced by the deep charge of spacecraft dielectric was to use dielectric materials or insulation structural components that never produce any pulsed discharges. By non-linearity modification experiment research on several...
Text and position coding of human-machine display interface
Zhang Lei, Zhuang Damin
2011, 37(2): 185-188.
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Abstract:
In process of operating aircraft, pilots need to use large amounts of information. So reasonable coding of information can improve driving safety. According to research requirements, a task model was developed for the ergonomics experiment. After subjects complete the tasks, their correct rate and r...
Optical-flow based circle biased proportional navigation
Qin Tian, Chen Wanchun, Xing Xiaolan
2011, 37(2): 189-192.
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For the passive homing missiles, a developed guidance law based on optical flow was proposed to impact a moving target with an impact angle constraint. In contrast to optical-flow based circle navigation guidance, it is more practical and precise. Meanwhile the improved one does not require the rang...
Influence of gap parameters on aerodynamics of multi-element airfoil
Qin Xuguo, Liu Peiqing, Qu Qiulin, Peng Guohui
2011, 37(2): 193-196.
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Abstract:
The effect of flap and slat riggings on the multi-element airfoil was investigated numerically. The compressible Navier-Stokes equations were solved by the finite-volume method. Spalart-Allmaras (S-A) turbulence model was used. The effects of flap and slat riggings on lift coefficients and pressure ...
Modeling of complex reflection coefficient for time-evolving sea surfaces
Li Xiaofei, Xu Xiaojian
2011, 37(2): 197-201.
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Abstract:
Based on the two-dimensional time-varying sea surface model and first-order small slope approximation method, the time-varying and statistical characteristics of complex reflection coefficients from sea surfaces were investigated. In terms of electromagnetic scattering amplitudes, the reflection coe...
Evaluation of engineering turbulence models for complex supersonic flows
Zhao Rui, Yan Chao
2011, 37(2): 202-205,215.
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Abstract:
Supersonic flows past a series of two-dimensional compression ramps were simulated by employing three popular engineering turbulence models, namely Spalart-Allmaras(SA), k-ω, shear stress transport(SST). The performance of the three engineering turbulence models was evaluated and summarized. All thr...
Binocular vision-based short-range navigation method for autonomous aerial refueling
Xie Hongwen, Wang Honglun
2011, 37(2): 206-209.
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Abstract:
To solve the short-range precise navigation problem in the probe-and-drogue autonomous aerial refueling, a binocular vision-based short-range navigation method was presented. This method used two cameras installed on the receiver to capture the images of the optical markers mounted on the end surfac...
Formation cooperative planning method based on multi-agent with resource constraints
Yang Fei, Wang Qing, Wu Zhendong
2011, 37(2): 210-215.
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Abstract:
After analysis on the anti-ship combat process of ship formation, theory of multi-agent system (MAS) was introduced into the decision-making process, and then the formation cooperative anti-ship combat agent model was established. Aiming at the key problem that the resource constraints among formati...
Pre-whitening filter of fractal noise in fiber optic gyroscope
Hua Chunhong, Ren Zhang, Zhang Minhu
2011, 37(2): 216-219.
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Abstract:
Fractal noise in fiber optic gyroscope (FOG) usually is long-term dependent, which causes FOG a rather slow drift. In order to filter this noise, a pre-whitening filter based on fractional difference (FD) was proposed. By this filter, fractal noise could be transformed into Gaussian white noise (GWN...
Online calibration based on in-flight alignment and optimal design
Zhang Xiaoyue, Yang Gongliu, Zhang Chunxi
2011, 37(2): 220-222.
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The navigation system precision was influenced by the output error of fiber optic gyro(FOG) inertial measurement unit(IMU). In order to complement ground calibration, FOG strapdown inertial navigation system(SINS) online calibration was carried out in airborne guidance weapon in-flight alignment pro...
Computerized tomography image registration based on sinogram
Sun Jingjing, Yang Min, Liu Jinghua, Wu Wenjin
2011, 37(2): 223-226.
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In order to resolve the image registration problem in X-ray nondestructive testing, a new computerized tomography image registration algorithm based the mathematical relationship between the parts displacement and the change of the projection data was proposed. The algorithm preprocesses the project...
Internal performance of counterflow thrust vectoring nozzle under different flight conditions
Zou Xinhua, Wang Qiang
2011, 37(2): 227-230,236.
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Abstract:
An analysis of the impact of internal performance on the counterflow thrust vectoring nozzle under different flight conditions was presented by numerical simulation. The results show in static conditions counterflow phenomena occurs on two nozzles of different slot hights when the secondary pressure...
Research and application of virtual maintenance technology
Zhou Dong, Huo Lin, Wang Meihui, Mao Deyao
2011, 37(2): 231-236.
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Abstract:
The theory of virtual maintenance is not fully studied and researches are deficiency in the field of virtual maintenance modeling and simulation. The methodology architecture of virtual maintenance were discussed and built, and virtual maintenance model and simulation control method were studied. Th...
Structural optimization of spacecraft based on two-level multi-point approximate method
Chen Shenyan, Huang Hai
2011, 37(2): 237-240.
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At the primal design stage of a new satellite, finite element model of the initial structure was established. Taking thicknesses of pipe beams and rectangle thin-wall beams as design variables, and considering constraints of natural frequency and strength, a structural optimization model was develop...
Simulation for throttling effect of small aperture multistage orifice units
Liu Wanlong, Liang Guozhu, Xu Ming, Zhang Huazhao
2011, 37(2): 241-244.
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Throttling effect of small aperture multistage orifice units was studied through simulation method. It was found that strict initial flow field was needed in this kind of simulation, and the simulation would be dummy-balanced with irrational initial flow field. This problem was solved by iterative f...
Novel tracking loop of BOC signal based on subcarrier tracking
Yang Zaixiu, Huang Zhigang, Geng Shengqun
2011, 37(2): 245-248.
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In order to eliminate the tracking ambiguity of binary offset carrier (BOC) signal, a novel tracking loop based on subcarrier tracking was proposed. Compared with traditional tracking loop, the proposed architecture provides a subcarrier locked loop to track subcarrier. The innovative tracking loop ...
Decoupling analysis between yaw and collective pitch controls of coaxial helicopter using free wake arithmetic
Xu Guanfeng, Chen Ming
2011, 37(2): 249-252.
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The yaw control of coaxial helicopters is gained from the differential control of collective pitches of up and down rotors. Hence, a coupling phenomenon can be found. Employing the free wake arithmetic, the aerodynamic analysis for the small coaxial helicopter was made, mainly focusing on the coupli...

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