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2012 Vol. 38, No. 2

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Security surveillance of low-altitude airspace with primary radar
Chen Weishi, Ning Huansheng
2012, (2): 143-148.
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An affordable low-altitude airspace experimental radar surveillance system was introduced and the target detection and tracking scheme based on plane position indicator (PPI) radar images was proposed, where clutter suppression and target state estimation are two critical techniques. After backgroun...
New method for rapid transfer alignment
Han Yinghong, Chen Wanchun
2012, (2): 149-152.
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Abstract:
To solve the transfer alignment problem on moving base of inertial navigation systems (INS), velocity plus attitude plus rate matching method was presented. Making use of three groups of parameters from both master and slave INS as the observations, Kalman filter was applied to estimate states such ...
Imaging position error compensation of scan mirror for spacecraft
Jia Yinghong, Xu Shijie, Chen Tong
2012, (2): 153-159,165.
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Abstract:
An imaging position error compensation algorithm was proposed for a two-degree-of-freedom scan mirror of a geostationary spacecraft. The investigation aimed to eliminate the detecting area error on the earth surface by compensation of the mirror scanning angles. The formulas for calculating the geoc...
Hypersonic vehicle rigid/elastic coupled dynamic modeling
Li Huifeng, Xiao Jin, Zhang Ran
2012, (2): 160-165.
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Abstract:
Extensive use of lifting body, wave-rider aerodynamic layout and other composite materials, thin-walled structures, lead the frequency of structural vibration and rigid body motion very close. This yields a great challenge to the vehicle control system design. Taking into account the transverse disp...
Aircraft cabin comfort analysis with human thermoregulation model
Pang Liping, Gong Mengmeng, Wang Jun, Cui Yi
2012, (2): 166-169,174.
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Abstract:
The studies about cabin thermal comfort are of great significance in the large aircraft market competition. A reasonable human thermal model is the key to analyze and evaluate the thermal comfort. Based on thermal characteristics experiment of human in the limited space, a human thermal model with t...
Error modeling and analysis for random drift of MEMS gyroscopes
Wang Xinlong, Li Na
2012, (2): 170-174.
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In order to comprehensively understand the characteristics of random drift error of micro-electro-mechanical systems(MEMS) gyroscope varying with time, the dynamic Allan variance was utilized to analyze the property of output signal of MEMS gyroscopes. Firstly, the theory of Allan variance and dynam...
New kind Baldwin-Lomax turbulence model under the limit of entropy
Zhao Rui, Yan Chao, Yu Jian
2012, (2): 175-179,190.
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A new kind correction to Baldwin-Lomax turbulence model (BL-entropy) based on the concept of entropy was proposed. The supersonic plane, two-dimensional supersonic compression corner and expansion-compression corner which were representative in the engineering area were chosen in the numerical simul...
Optimization and experimental verification for aerodynamic scheme of flying-wing
Bao Junbo, Wang Ganglin, Wu Zhe
2012, (2): 180-184.
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The characteristic arguments to describe the plane shape considering the stealthy and aerodynamic performance of the flying-wing was proposed, the constraint relation in the scheme optimization was analyzed. The 3-dimensional curved surface model was built by using parameterization method, and the p...
Dynamic analysis and simulation of soft-landing for lunar lander
Luo Songbai, Zhao Yongjia
2012, (2): 185-190.
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Taking the four-leg lunar lander as the study object, the lander's component structure and lunar physical attribute was analyzed. When studying the lander's dynamics, a block parameter simulation method based on structure was proposed, which analyzes the lander's dynamic behavior during the landing ...
Development of experiment dummy for aerospace dynamic experiment testing
Liu Songyang, Xu Yuanming, Yang Chunxin
2012, (2): 191-194,201.
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Abstract:
The performance and development status of experiment dummy for national aerospace dynamic experiment testing was introduced. The development task can be divided into four parts: the human body parameter measuring system, dummy mechanical structure system, data collection and processing system, and d...
Measurements and analysis of high-power slot-type piston actuator flow-field
Liu He, Dong Jinzhong, Wu Naiming
2012, (2): 195-201.
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Abstract:
A high-power piston actuator was investigated and peak instantaneous velocity could be up to 0.3 Mach number. Exit velocity and vorticity distribution were obtained through experimental measurements. Synthetic jet flow structure and characters were investigated. Coaxial jet mixing was controlled by ...
Constant power H∞ stabilization control strategy on airborne pump supplying system
He Liuyu, Li Yunhua, Liu Guojian
2012, (2): 202-207.
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Abstract:
Taking the constant power control of the airborne pump supplying as the goal, and addressing on the load variation during the process of the operation, the control strategy for keeping the output power constant to increase the utilization degree to the power of the engine was used. For the main cont...
Attitude model of spinning warhead with cooled shroud when liquid nitrogen is consuming
Yu Zhengning, Zhao Yushan
2012, (2): 208-212.
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Abstract:
An attitude dynamics model of spinning warhead flying at free stage with a cooled shroud was established while liquid nitrogen filled in porous medium layer was consuming. The effect of liquid nitrogen movement to spinning warhead is difficult to calculate and simulate directly in engineering, accor...
Artificial potential function method for satellite electromagnetic formation control
Su Jianmin, Dong Yunfeng
2012, (2): 213-217,238.
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Abstract:
The relative motion of electromagnetic satellites is activated by electromagnetic force between satellites. The control law should satisfy two conditions, low calculation burden and ability of avoiding collision. The control objects are relative motion vectors of satellites to reference satellite. T...
Experiments on static characteristics of metal rubber particles
Hong Jie, Zhu Bin, Ma Yanhong, Chen Lulu
2012, (2): 218-221.
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Abstract:
According to problems of the high mode density of natural frequencies of plane-shell structure and a broad spectrum of aerodynamic excitation forces, a new metal rubber (MR) component was designed by improving the processing technology of MR. It is called metal rubber particles (MRP). The WDW3100 el...
Real-time analysis and assessment method of time-triggered CAN-bus
Xia Jiqiang, Xue Liqiang, Man Qingfeng
2012, (2): 222-227.
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Abstract:
To solve the problem that time-triggered CAN (controller area network) bus system lacked a unified real-time performance assessment method, a complete system establishment and assessment scheme was proposed. Time-triggered CAN-bus system scheduling matrix was established by using average-loading alg...
Network reliability allocation method based on heuristic algorithm
Li Ruiying, Ren Wuyue
2012, (2): 228-232.
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Abstract:
As network structure is difficult to be described with series and parallel models. Those traditional reliability allocation methods cannot be used by networks directly. A new method based on heuristic algorithm was advanced to solve the k/N terminal reliability allocation problem. Like advisory grou...
Pseudo-life-based test method of mechanism consistency boundary for accelerated degradation testing
Lin Fengchun, Wang Qiancheng, Chen Yunxia, Kang Rui
2012, (2): 233-238.
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Abstract:
A pseudo-life-based test method of mechanism consistency boundary for accelerated degradation testing was proposed, according to mechanism consistency condition for lifetime random variables. Based on the pseudo life estimates, an F statistic was established to test the homogeneity of degradation me...
Estimation of salt-pepper noise in images in wavelet domain
Li Tianyi, Wang Minghui, Lin Tao, Yu Wensen
2012, (2): 239-243,251.
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Abstract:
A novel approach was proposed for estimating the density of salt-pepper noise in images using wavelet transform. On the basis of the fact that the wavelet coefficients of all natural images conform to stable and close distribution, as well as such distribution of the noisy image may be influenced by...
Testing of ignition delay of second pulse of soft-clapboard dual-pulse motor
Cao Xiwei, Ren Junxue, Wang Changhui, Liu Yu
2012, (2): 244-246.
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Abstract:
When doing the experiment of soft-clapboard dual-pulse motor, the delay time of the second pulse ignition was found exceeding the requirement. In order to improve the status, the experiments in terms of the quantity of ignition powder and the thickness of the soft-clapboard were carried out. The res...
Adaptive sampling method of face gear tooth surface
Zhang Li, Ding Zhiyao, Wang Yanzhong
2012, (2): 247-251.
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Digitizing of face gear tooth surface is one of the key technologies on the tooth surface measurement. Aiming at the sampling of tooth surface on CMM(coordinate measuring machine), a method to determine the quantity of the sampling mesh points according to given precision was presented. The boundary...
Analysis on ionospheric delay correction method of space-borne single-frequency GPS data
Qu Xiaochuan, Li Zhenghang, Gong Xiaoying
2012, (2): 252-256.
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Abstract:
With the technology of standard point positioning based on C/A code received by low earth orbit(LEO), one of the ionospheric delay correction method,the method of ionospheric scale factor, was discussed. The computed ionospheric scale factor α using the mean and instantaneous value of F2 region maxi...
Theory and method of creating dual network model in network planning
Su Zhixiong, Li Xingmei, Qi Jianxun
2012, (2): 257-262.
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Aiming at problem that existing network planning model incarnates specific time and path length prominently instead of its core float and path length difference, which makes obstacles common exist when using the model in practice, dual model of network planning model was founded by using dual theory...
Moving object detection using motion enhancement and color distribution comparison
Guo Jiang, Gu Duoyu, Li Shuxiao, Chang Hongxing
2012, (2): 263-267,272.
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Abstract:
To detect moving objects from videos taken by unmanned aerial vehicles, an approach using motion and color cues was proposed. It adopted the forward motion history image to enhance the independent moving information and suppress the noises in background areas, enabling the candidate moving regions t...
Optimization of non-local impedance parameters of viscoelastic materials
Fan Zhenzhen, Wang Tongqing, Yang Mingsui
2012, (2): 268-272.
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Abstract:
The context was devoted to the construction of a basic algebraic model for calculating non-local acoustic impedance matrix about acoustic scattering problem. A sphere laid by a certain kind of viscoelastic material was waken for example. The globally convergent method of moving asymptotes (GCMMA) wa...
Algorithm based on continuous data stream for dynamic gesture recognition
Zheng Wei, Shen Xukun
2012, (2): 273-279.
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For the purpose of recognizing the sequence of dynamic gesture made by operator, a method was presented based on continuous data streams sampled from data glove, which used singular value decomposition (SVD) to eliminating noise and extracting features. The characteristics of physiology about joint ...
Automatic recognition of hyperspectral image based on spectral knowledge
Niu Zhiyu, Zhao Huijie
2012, (2): 280-284.
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In order to solve the problems of current methods for mineral recognition from hyperspectral data, such as the requirement for prior information, the failure to make full use of absorption features and the lack of the automation of recognition process, an automatic recognition approach based on the ...

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