Advanced Search

2005 Vol. 31, No. 10

  Previous Issue | Next Issue 
Display Method:
Pulsed phase thermography and its application in the NDT of composite materials
Guo Xingwang, Liu Yingtao, Guo Guangping, Yang Danggang
2005, 31(10): 1049-1053.
Abstract References Relative Articles Resource File Access Statistics iconViews 3615 iconDownload 9118
Abstract:
To suppress various interference and increase the detection capability of pulsed thermography for defect inspection of composite materials, PPT (pulsed phase thermography) based on FFT(fast Fourier transform) for the time history of each pixel and its application to composite structures were studied...
Anti-aliasing technique for surface reconstruction of confocal data
Xue Bindang, Jiang Zhiguo, Zhou Xiaokuan
2005, 31(10): 1054-1057.
Abstract References Relative Articles Resource File Access Statistics iconViews 2625 iconDownload 1196
Abstract:
There might exists missing holes and aliasing on the projected image by way of representing object surface with boundary voxels and projecting boundary voxels to the screen as points to render the shading image of the object. An anti-aliasing technique for surface reconstruction is proposed. Firstly...
Research on colliding and cushioning of wall-suspension robot
Zhang Zhaojun, Yan Ning, Zong Guanghua
2005, 31(10): 1058-1062.
Abstract References Relative Articles Resource File Access Statistics iconViews 2486 iconDownload 880
Abstract:
Based on the requirement of automatically getting on wall and cushioning, the form mechanism of pull force of robot, cause and process of touch wall were analyzed. Utilized the principle of aerodynamics, calculating method of the pulling force was given and the result was verified through experiment...
Motion compensation processing for airborne SAR data based on real sensing data of IMU/GPS
Ye Shaohua, Zhou Yinqing
2005, 31(10): 1063-1065.
Abstract References Relative Articles Resource File Access Statistics iconViews 3232 iconDownload 1277
Abstract:
The motion compensation technique for airborne stripmap mode SAR(synthetic aperture radar) was briefly analyzed, the strong motion errors with small aircraft Y12 were evident through analyzing the position parameters offered by an IMU/GPS(inertial measurement units/global positioning system) unit wi...
Error analysis of prediction orbit determined by GLONASS ephemeris
Ma Jun, Jiao Wenhai, Xiao Yelun
2005, 31(10): 1066-1070.
Abstract References Relative Articles Resource File Access Statistics iconViews 3290 iconDownload 1627
Abstract:
The equation of satellite orbital motion was derived in the conventional terrestrial coordinate system. By analyzing the fitting precision of satellite prediction orbit determined by GLONASS(global navigation satellite system) broadcast ephemeris,it is pointed out that the simplified models of pertu...
Influence of applied stress on cracking and apalling of oxide film in room temperature
Wang Jingru, Zhu Liqun, Zhang Zheng, Zhong Qunpeng
2005, 31(10): 1071-1075.
Abstract References Relative Articles Resource File Access Statistics iconViews 3218 iconDownload 988
Abstract:
The cracking and spalling behavior of the oxide film under applied stress in room temperature was studied. The critical applied stress of oxide film cracking and spalling was calculated. By dynamic tension experiments of oxide film on A3 steel and LY12CZ aluminium alloy, the existence of critical ap...
Analysis and improvements of a remote authentication scheme
Zhang Lihua, Lü Shanwei
2005, 31(10): 1076-1079.
Abstract References Relative Articles Resource File Access Statistics iconViews 3037 iconDownload 886
Abstract:
Password authentication scheme is a very promising and practical solution to remote user authentication.The security of a proposed password authentication scheme using smart cards is analyzed. The scheme has some weaknesses: it cannot resist parallel session attack, an intruder without knowing users...
Production of streamwise vortexes in a turbulent boundary layer
Liu Kai, Zhang Nan, Lu Lipeng
2005, 31(10): 1080-1083.
Abstract References Relative Articles Resource File Access Statistics iconViews 3326 iconDownload 892
Abstract:
The whole process of the production and the development of the streamwise vortexes are studied. By using the method of direct numerical simulation, the production of the streamwise vortexes and the process from quasi-2-dimensional coherent structures to 3-dimensional coherent structures in the wall ...
Lyapunov adaptive filtering and its application in INS/SMNS integrated navigation system
Zhao Long, Chen Zhe
2005, 31(10): 1084-1086.
Abstract References Relative Articles Resource File Access Statistics iconViews 3020 iconDownload 948
Abstract:
In order to overcome the shortcomings that traditional least square algorithm tends to become divergence with the increase of matching points INS/SMNS (inertial navigation system/scene matching navigation system) integrated navigation system, an improved LAF(Lyapunov adaptive filtering), based on MI...
Control response character of the rotorcraft with slung load in forward flight
Guo Guangli, Gao Zheng, Sun Chuanwei
2005, 31(10): 1087-1091.
Abstract References Relative Articles Resource File Access Statistics iconViews 2721 iconDownload 964
Abstract:
A rotorcraft with slung-load model was built for the general real-time flight simulation program. A general dynamic, distortional wake model based on the nonlinear and unsteady Peters-He inflow model was investigated and applied to the real-time wake model, it was an important part in the forward ac...
Integral method for ultimate load analysis of concrete-filled steel tubular columns
Tu Yongqing, Li Cong
2005, 31(10): 1092-1095.
Abstract References Relative Articles Resource File Access Statistics iconViews 3002 iconDownload 783
Abstract:
Based on the synthesis method for calculating elastic-plastic ultimate load of concrete-filled steel tubular columns, a new numerical method is put forward. Hypotheses in the calculation only include the cross-section plane hypothesis and the stress-strain relation of steel and concrete with a consi...
Effect of low profile additives on the shrinkage and mechanical properties of unsaturated polyester
Sun Zhijie, Xue Zhongmin, Yang Bo, Zhang Zuoguang
2005, 31(10): 1096-1100.
Abstract References Relative Articles Resource File Access Statistics iconViews 3639 iconDownload 1171
Abstract:
In order to reduce the high shrinkage ratio and great brittleness of UPR(unsaturated polyester resin), two kinds of LPA(low profile additives), which are LPA-4016 of polyvinyl acetate and LPA-7301 of polystyrene, are added into UPR cast separately. The effects of LPA on the shrinkage rate and mechan...
Noise robust ICA feature extraction algorithm for hyperspectral image
Du Peng, Zhao Huijie
2005, 31(10): 1101-1105.
Abstract References Relative Articles Resource File Access Statistics iconViews 3412 iconDownload 1469
Abstract:
Feature extraction is important to hyperspectral imagery processing in that it can distinguish special featured object from background clutter and remove redundant information. An ICA(independent component analysis) based on the feature extraction algorithm for hyperspectral remote sensing data is p...
Adaptive sliding mode control using RBF network
Luo Tingting, Liu Jinkun
2005, 31(10): 1106-1109.
Abstract References Relative Articles Resource File Access Statistics iconViews 3440 iconDownload 908
Abstract:
Like most practical systems, high precision simulator is sensitive to nonlinearities, external disturbances and parameter perturbations. To solve such control problems, an adaptive sliding-mode controller based on RBF network was adopted. The proposed controller was divided into two parts: a nominal...
Effect of channel mismatch and mutual coupling on GPS adaptive array
Lu Yan, Tan Zhanzhong, Ding Ziming
2005, 31(10): 1110-1115.
Abstract References Relative Articles Resource File Access Statistics iconViews 3449 iconDownload 1605
Abstract:
In order to ascertain the specification of the main modules of an anti-jamming GPS receivers, it is necessary to analyze the effect of channel mismatch and antenna mutual coupling on SINR(signal interference noise ratio) and ICR(interference cancellation ratio). In term of the signal environment of ...
Experiment study on magnet sensitivity of fiber optic gyro
Wang Xiaxiao, Song Ningfang, Zhang Chunxi, Ma Zongfen
2005, 31(10): 1116-1120.
Abstract References Relative Articles Resource File Access Statistics iconViews 3145 iconDownload 892
Abstract:
Fiber coil is the sense element of FOG(fiber optical gyroscopes). Except Sagnac effect, magneto-optic Faraday effect is one of the main non-reciprocity effect of FOG. Magneto-optic Faraday effect is caused by fiber twist and residual birefringence during fiber producing and fiber coil winding. It ca...
Wave properties of a traffic flow model for freeways with two lanes
Tang Tieqiao, Huang Haijun
2005, 31(10): 1121-1124.
Abstract References Relative Articles Resource File Access Statistics iconViews 2754 iconDownload 1313
Abstract:
A new continuum traffic flow dynamics model for freeways with two lanes where the faster vehicles are allowed to travel on both lanes while the slower vehicles are allowed to travel on the slower lane only, is developed through applying the speed gradient-based momentum equation for each lane. Some ...
Migration from object-oriented legacy system to component-based system
Liu Dongyi, Li Hu, Jin Maozhong, Liu Chao
2005, 31(10): 1125-1129.
Abstract References Relative Articles Resource File Access Statistics iconViews 3049 iconDownload 861
Abstract:
In order to reduce costs, increase productivity, researchers and practitioners make massive research on software reuse. To create reusable assets and reengineer legacy systems, identifying, extracting and reengineering software component that implement abstractions within systems is one of the most ...
Research on software architecture of embedded software simulation testing environment
Zhong Deming, Liu Bin, Ruan Lian
2005, 31(10): 1130-1134.
Abstract References Relative Articles Resource File Access Statistics iconViews 2834 iconDownload 1006
Abstract:
It is an acknowledged and effective method to test real-time embedded software with ESSTE(embedded software simulation testing environment). The software architecture of ESSTE is described systematically based on UML and "4+1" views model. The contents in different views can coordinate with each oth...
Non-linear least square estimation of geometrical parameters for cone-beam three dimensional computed tomography
Yang Min, Lu Hongnian, Kong Fanqin, Zhang Quanhong
2005, 31(10): 1135-1139.
Abstract References Relative Articles Resource File Access Statistics iconViews 3351 iconDownload 1029
Abstract:
The accuracy of reconstructing geometrical parameters is precisely controlled in three-dimensional computed tomography. Because in practical X-ray imaging system, they can’t be measured through direct methods, how to ensure their accuracy becomes the spiny problem. The non-linear least square estima...
Method of EEG signals classification based on wavelet transform and neural networks
Mao Xia, Meng Qingyu
2005, 31(10): 1140-1144.
Abstract References Relative Articles Resource File Access Statistics iconViews 3336 iconDownload 17661
Abstract:
Electroencephalography (EEG) signals of alcoholic subjects and control subjects were classified by combination of wavelet transforms and neural networks. Classification features were discovered through the EEG data analysis. The frequency bands of EEG signals including classification features were e...
Numerical simulation of the flowfield around helicopter engine inlet
Cao Yihua, Yuan Kungang, Li Xiaoyong, Yin Wanli
2005, 31(10): 1145-1148.
Abstract References Relative Articles Resource File Access Statistics iconViews 2927 iconDownload 994
Abstract:
To obverse the flow field of a helicopter engine inlet, the finite volume method was adopted and Navier-Stokes (N-S) equation was solved by generating the body-fitted structural grid. The low speed and hovering flight of MI-171 helicopter were numerically simulated, and the flow field characteristic...
Dynamic traffic assignment model based on fuzzy travel time
Wang Li, Wang Chuanjiu, Shen Xiaorong, Fan Yuezu
2005, 31(10): 1149-1152.
Abstract References Relative Articles Resource File Access Statistics iconViews 2570 iconDownload 1251
Abstract:
A new fuzzy dynamic traffic assignment (FDTA) model was proposed. Firstly, the fuzzy theory was used to describe the real-time link travel time and path travel time. Secondly, fuzzy shortest path sets were found based on h-level sets, and then their membership functions were calculated. Thirdly, the...
Modified RBAC model and its application on content management system
Cao Yonggang, Jin Maozhong, Liu Chao
2005, 31(10): 1153-1158.
Abstract References Relative Articles Resource File Access Statistics iconViews 3516 iconDownload 1130
Abstract:
Focusing on the large scale characteristic of content, users and permissions in content management system (CMS), a modified role based access control(RBAC) model, RBAC0.5, is formally defined. In contrast with the four models defined by RBAC96, the RBAC0.5 is formed as a new model between the basic ...

Copyright © Journal of Beijing University of Aeronautics and Astronautics

Address: Editorial Department of Journal of Beijing University of Aeronautics and Astronautics, 37 Xueyuan Road, Haidian District, Beijing Post Code: 100191 Email: jbuaa@buaa.edu.cn

Supported by: Beijing Renhe Information Technology Co., Ltd.