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2010 Vol. 36, No. 9

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Calculating method for matching enthalpy parameter of four-wheel-bootstrap refrigeration system for civil aircraft
Zhang Xingjuan, Li Feng, Yang Chunxin
2010, 36(9): 1009-1012.
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Abstract:
The foreign advanced civil airplane cabin refrigeration system has been developed from three-wheel-bootstrap to four-wheel-bootstrap high pressure water-separation system. The traditional method used for matching the system thermal parameters was complicated. A new model for calculating the enthalpy...
Flow and heat transfer in the complex passages of turbine blade trailing edge
Deng Hongwu, Tan Yan, Wang Jiaren, Luo Xiang
2010, 36(9): 1013-1016.
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Abstract:
Experimental method was used to study the characteristics of heat transfer and flow resistance in turbine blade trailing edge complex passages. This experiment use vapor heating method, and this method could make the experimental model have equivalent wall temperature boundary condition. The experim...
Fast PN code acquisition for satellite spread spectrum transponder
Feng Wenquan, Zhang Dezhi
2010, 36(9): 1017-1020.
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Abstract:
Large Doppler offsets are inherent to direct spread spectrum signal due to high dynamic environment in low earth orbit satellite communication scenarios. Frequency offset can be dozens of kilohertz, which cause traditional acquisition approach failed to complete PN code acquisition. A part-coherent ...
Aircraft collision risk assessment at intersecting air routes
Meng Xiangwei, Zhang Ping, Wang Ying
2010, 36(9): 1021-1025.
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Abstract:
After compared with the classical Reich modal, improvements was made on an event-based aircraft collision risk model at intercepting routes, the collision risk due to possible vertical relative movement was counted for aircraft in straight and level flight. The possible reason why the horizontal col...
Rail wear measurement method based on structured-light vision
Sun Junhua, Wang Weihua, Liu Zhen, Zhang Guangjun
2010, 36(9): 1026-1029.
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The principle of rail wear measurement based on structured-light vision was analyzed. A method for dynamically measuring rail wears in vehicle-mounted was proposed. The structured-light vision sensor was installed at the bottom of the train, and the section profile of the rail was measured. Taking r...
Method for investigation of the optimal redundant gyros number based on reliability analysis
Fu Li, Wang Xinling, Yue Yazhou
2010, 36(9): 1030-1033.
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To solve redundant gyros configuration problem of the strapdown inertial navigation system with redundancy technique in sensor level, a method to determine the optimal number of gyros that compose the redundant system was proposed with a view to the system reliability and cost. It was assumed that t...
Rotor icing model and trim characteristics analysis for tandem helicopter
Li Guozhi, Cao Yihua, Zhong Guo
2010, 36(9): 1034-1037.
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A theoretical rotor icing model was proposed based on the computational fluid dynamics (CFD) technique to study the tandem rotor helicopter dynamics due to icing. Considering the rotor blade ice shedding and local temperature variation on the rotor blade, another engineering rotor icing model was ad...
Lateral-directional control of tailless aircraft with multiple control surfaces
Feng Lihao, Wang Jinjun, Yu Dongsheng
2010, 36(9): 1038-1042.
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The influence of control surfaces deflection on lateral-directional characteristics of a tailless aircraft with multiple control surfaces was investigated in a wind tunnel using force measurement. Both single deflection and simultaneous deflection of elevons and flaperons have a good effect of lift ...
Semantic security algorithm for wireless sensor network
Kang Yimei, Wang Tao, Hu Jiang, Zhao Lei
2010, 36(9): 1043-1047.
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To improve security of communication data in WSN (Wireless Sensor Networks), a semantic security algorithm based on a changing mapping table was presented. Considering of threshold-sensitive characteristics of WSN application, a data collection method with variable precision was used, i.e. high coll...
Simulation and flight test of trajectory in terminal guidance
Xi Shenghai, Xiang Jinwu
2010, 36(9): 1048-1051.
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A method of simulation and flight test for seeker-s particular trajectory in terminal guidance was presented. In the flight simulation of trajectory in terminal guidance, height decrease by the entry maneuver need to be achievably small, and precision request of tracking in the diving flight phase s...
Object-oriented method for virtual organization integrated modeling
Tang Wenzhong, Qin Jingyi
2010, 36(9): 1052-1056.
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Abstract:
These integrated modeling methods named virtual organization integrated modeling(VOIM) were discussed, which can be used for agile virtual organizations process dynamic optimization. These methods were integrated by unified modeling language(UML), the methodologies of integration definition for func...
Optimal of initial spares scenario in civil aviation
Xiao Boping, Kang Rui, Wang Naichao
2010, 36(9): 1057-1061.
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To meet the requirements that airline depresses initial spares cost and increases the airplane-s utilization, maximum marginal utility based optimal methods for initial spares scenario was presented. By the algorithm of Poisson distribution, items spare scenarios could be given only when the support...
Structural optimization of flexible aircraft considering aileron efficiency based on experimental aerodynamic forces
Shao Ke, Wan Zhiqiang, Yang Chao, Zhang Bocheng
2010, 36(9): 1062-1066.
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Wing-s structural optimization of a flexible aircraft was conducted to solve aileron reversal problem utilizing a genetic algorithm. The aileron efficiencies and rates of roll of the aircraft were calculated using nonlinear experimental aerodynamic forces. The emphasis research was wing-s structural...
Application of Gap criterion in prediction of category Ⅱ PIO
Meng Jie, Xu Haojun, Li Dawei, Zhang Jiankang
2010, 36(9): 1067-1070.
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To solve advanced fighter flight safety problem caused by category Ⅱ PIO (pilot induced oscillations), the Gap criterion was applied to predict category Ⅱ longitudinal PIO. The sinusoidal input/triangle output describing function model of rate limiting was built and the Neal-Smith pilot model was im...
New interface boundary condition method for coupled thermal simulations
Li Pengfei, Wu Songping
2010, 36(9): 1071-1074.
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A new interface boundary condition method was advanced for coupling between hypersonic flow field and structural heat transfer. The new coupling scheme consisted of solving an additional partial differential equation on the interface, which was derived from the Dirichlet and Neumann conditions at th...
Dexterity optimization based on orthogonal test of 3P3R grinding robot
Zhang Dong, Yun Chao, Song Dezheng, Gao Zhihui
2010, 36(9): 1075-1079.
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Abstract:
The precision is impacted when the robotic grinding path is discontinuous and the gripper needs to be replaced during manufacturing. In order to solve this problem, a new type grinding robot, 3P3R, was proposed. Based on D-H notation, space kinematics modeling of the grinding robot was presented, an...
Channel assignment scheme for virtual hierarchical wireless mesh networks
Hu Zhiyuan, Su Jiayong, Guo Ji
2010, 36(9): 1080-1083.
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Abstract:
To gain high user diversity and routing stability in wireless mesh network, a virtual hierarchical structure was proposed, in which the nearby nodes were aggregated to virtual cells. Nodes inside the virtual cell can communicate with each other and take the identical traffic relay functions. The bot...
Experience based grasping gesture synthesis and data glove calibration
Wang Bin, Dai Shuling
2010, 36(9): 1084-1088.
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An experience based gesture database construction method is proposed to solve the two primary problems for current calibration routine as: the difficulty for ground-truth data gathering and the oversimplified calibration model. By considering the anatomic structure of human hand and sensor layout of...
Effect of humidity on storage reliability of plastic encapsulated microcircuits devices in hygrothermal environment
Liu Huicong, Xing Yang, Li Weiping, Zhu Liqun
2010, 36(9): 1089-1093.
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Abstract:
According to the storage reliability problems of plastic encapsulated microcircuits (PEM) devices in hygrothermal environment, effect of humidity on moisture absorption, surface estate and electrical performance of PEM was investigated through hygrothermal test. The results show that, humidity in th...
Micro-Doppler analysis of spatial coning precession based on generalized S transform
Lei Peng, Wang Jun, Sun Jinping, Li Shaohong
2010, 36(9): 1094-1098.
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Precession characteristic is one of the significant properties for cone-shaped spatial target recognition. To analysis the micro-Doppler feature induced by precession, a method based on the generalized S transform was proposed. In the mathematical model of coning precession, the multi-coordinate sys...
Analysis of polarization dependence of fiber optic security systems
Li Chen, Zhang Chunxi, Liang Sheng, Li Qin
2010, 36(9): 1099-1102.
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Abstract:
The fiber-optic distributed disturbance sensor with dual Mach-Zehnder interferometers can be used in detecting intruder, cracks, and oil or fuel leaks. The position of the disturbance was obtained by the time delay difference between the output signals of the two Mach-Zehnder interferometers. Accord...
Adaptive industrial CT outlier detection and accommodation using innovation orthogonal
Zuo Kai, Sun Tongjing, Li Zhenhua, Tao Liang
2010, 36(9): 1103-1107.
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The problem of defect recognition in industrial CT(computerized tomography) projection image was discussed based on the innovation orthogonality principle. Projection image was modeling in a 2-D state space structure. By analyzing the innovation orthogonality of Kalman filtering algorithm, a dynamic...
Dynamics and simulation of autonomous underwater vehicle based on control moment gyros
Lian Lun, Wu Zhong
2010, 36(9): 1108-1112.
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To improve autonomous underwater vehicle(AUV)-s low velocity control performance, a control moment gyro (CMG) was introduced as the attitude control system. Taking the fluid dynamics into account, the dynamic model of AUV was built based on CMG, and a simulation and analysis on AUV-s kinematics and ...
Application of uniform design in missile components accelerated life testing
Wang Daozhen, Zhang Xiaojie, Shu Xiaofen
2010, 36(9): 1113-1116.
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Abstract:
Temperature and humidity are typical stresses that affect the life of missile storage. Accelerated life testing is becoming a new trend to predicate the reliability of missile storage.In order to optimize the experimental design and propose corresponding parameter estimation method, the testing sequ...
Radiation-shielding method of space electronic equipments and its software
Wang Gang, Wang Chunjie, Wang Bin
2010, 36(9): 1117-1120.
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Abstract:
A radiation-shielding method of space electronic equipments was researched, and its complicated calculating process was made into program by using computer aided design(CAD) technology and other developing software. The information from the files generated by the professional circuit board software ...
Image registration approach based on improved SIFT
Liu Jian, Zhang Guohua, Huang Linlin
2010, 36(9): 1121-1124.
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To resolve the problem of large angle and large scale image registration, an improved approach based on scale invariant feature transform (SIFT) is proposed. The log-polar technique was applied to estimate the parameters of rotations scales between reference image and sensed image. The images were s...
Analytical method of electromagnetic susceptibility for radio frequency receiver at behavior level
Yu Xiaofeng, Yan Zhaowen, Xie Shuguo, Liu Yan
2010, 36(9): 1125-1130.
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Based on simplified Volterra model, an approach to the simulation analysis of electromagnetic susceptibility (EMS) for radio frequency (RF) receiver at behavior level was presented. Third order simplified Volterra model was adopted to analyze receiver EMS. A general criterion for EMS was proposed ac...
Modeling and simulation of topographic effects for hyperspectral remote sensing
Wang Yachao, Zhao Huijie, Jia Guorui
2010, 36(9): 1131-1134.
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Aiming at geometric deformations and radiation changes caused by rugged terrain for the hyperspectral remote sensing images, a model of topographic effects for hyperspectral remote sensing was proposed. In the model, the imaging geometry relationship between simulation image pixel coordinates and gr...

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