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2011 Vol. 37, No. 6

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Virtual extension imaging applied to large FOV attitude angle measurement
Jiang Jie, Wang Haoyu, Zhang Guangjun
2011, 37(6): 631-634.
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Virtual extension imaging was proposed to apply to large field of view (FOV) attitude angle measurement based on photoelectric collimation and pinhole imaging theory. The FOV was virtually enlarged through multi-imaging. Based on the designed anisomerous pinhole diaphragm, an identify method for spo...
Simulation of G-loads in post-stall maneuver on sustained G-load flight simulator
Pan Wenjun, Wang Lixin, Tan Xiangsheng
2011, 37(6): 635-638.
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Methods of simulating G-loads in post-stall maneuvers on a novel sustained G-load flight simulator (SGFS) was studied. Considering features of intense angular motion of the aircraft in post-stall maneuvers, additional G-loads generated by the rotation of the aircraft were also counted in the calcula...
Sensor fault diagnosis algorithm based on adaptive UKF
Hu Di, Dong Yunfeng
2011, 37(6): 639-643.
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To the questions of the abnormal values and the instruments failures for the nonlinear sensor measurement systems, a robust fault diagnosis algorithm based on adaptive unscented Kalman filtering (UKF) was proposed. An adaptive matrix was produced according to the innovation of UKF, then a systems- d...
Match features of aircraft-carrier parameters during ski-jump takeoff
Liu Xingyu, Xu Dongsong, Wang Lixin
2011, 37(6): 644-648,653.
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The influence of primary aircraft-ramp parameters on ski-jump takeoff safety was analyzed by numerical simulation. The match set of primary parameters that satisfy the takeoff safety criteria was computed and the match law was summarized. The results indicate that the takeoff mass is the primary eff...
Prediction of lateral liquid sloshing force of tank based on neural networks
Kang Ning, Jia Jia, Liu Xi
2011, 37(6): 649-653.
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Numerical simulation of liquid sloshing force under lateral acceleration of reference tank was conducted with volume of fluid (VOF) model of fluent software. Liquid filling ratio, forces, acceleration were set as inputs, while forces after a few seconds as target outputs. Reasonable distributed resu...
Technique of aircraft loads spectrum statistics based on kernel density estimation
Tang Ani
2011, 37(6): 654-657,664.
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Restricted by real condition, small sample method is usually used to measure the aircraft loads spectrum. The small sample data is a simple sample from the real matrix, which can-t ensure the adequacy and the integrity of data. The traditional average statistics method which is the common method to ...
Novel buck-boost converter based on Z-source
Qi Bojin, Du Qing, Zhang Jin, Ma Jun
2011, 37(6): 658-664.
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Basic non-isolated buck-boost circuit exists the problem of short-circuit ring caused by the diode-s reverse recovery. A buck-boost DC/DC converter based on Z-sourse was designed. The presence of short-circuit ring was avoided from the circuit structure. The step response of initial state of the Z-n...
Base excitation and load identification based on Craig reduction model
Zhu Siyan, Zhu Liwen
2011, 37(6): 665-668,679.
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Load identification use measured acceleration of few degree of freedom (DOF) to determine external applied load. Base excitation give movement upon foundation freedom to excite the structure, and then obtain the whole dynamic response. Making use of characteristics of Craig reduction model, and the ...
Computation of scatter characters of media target based on GRECO
Fang Ning, Wang Shuailei, Wang Gu, Wang Taosheng
2011, 37(6): 669-672.
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Among all the methods of computing the scatter characters of radar targets, graphic electromagnetic method and ray tracing technique are two valid ways in high frequency.A valid method was presented to combine these two ways. First, with the help of illumination model and automatic hiding in OpenGL,...
Methods of image processing for automatic grading of porosity defects in aeronautical alloy
Wu Xin, Qi Bojin, Zhang Jianhe
2011, 37(6): 673-679.
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Aiming at the disadvantage of manual grading of porosity in aeronautical alloy cast currently, a method of automatic grading by image processing and pattern recognition of computer to images got by X-ray radiography was put forward, and the methods of image processing and pattern recognition were ma...
Rapid wing structural finite element modeling and automated adjustment
Luo Mingqiang, Feng Haocheng, Liu Hu, Wu Zhe
2011, 37(6): 680-684.
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In order to improve the quality and efficiency of civil airplanes conceptual and preliminary design, the method of wing structural finite element modeling and automated adjustment in a computer aided aircraft conceptual/preliminary design system called open conceptual aircraft design system(OpenCADS...
Numerical analysis of high-temperature-gas wind tunnel thermal characteristics
Yao Feng, Dong Sujun, Wang Jun
2011, 37(6): 685-689,694.
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An experimental method using subsonic high-temperature gas flow to simulate aerodynamic thermal environment of near space hypersonic vehicle was introduced. In the test section of the experiment equipment, the room temperatwe air was ejected by the subsonic high-temperature gas flow to make the heat...
Method to analyze the impact of maintenance and support process based on neural network
Wen Jingqian, Li Qing, Zhao Qingbin
2011, 37(6): 690-694.
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To solve the problem in determining key influence factors of maintenance and support, a new quantitative method was put forward which takes the support service processes as analysis object. In this method, the relation function between the influence factors and equipment performance was established,...
Efficient design of multi-rate low-density parity-check code decoder
Zhao Ling, Zhang Xiaolin, Hou Yi
2011, 37(6): 695-700.
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An efficient partially parallel decoder architecture suited for multi-rate low density parity check(LDPC) codes was presented. Algorithmic transformation and architectural level optimization were incorporated to reduce the critical path. The check node updating units (CNU) and the variable node upda...
Hybrid RANS-LES method applied to backward facing step flow
Wu Jingfeng, Ning Fangfei
2011, 37(6): 701-704.
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Turbulent flow over a backward facing step was simulated using a hybrid Reynolds averaged navier stokes (RANS)-large eddy simulation(LES) approach, and the results were compared with experimental data. The hybrid system combines delayed detached-eddy simulation (DDES) with an improved RANS-LES hybri...
Biased Monte Carlo method for reliability sensitivity analysis
Li Jinghui, Kang Rui
2011, 37(6): 705-710,716.
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The likelihood ratio (LR) method was chosen as the basic derivative/gradient estimation method for reliability sensitivity analysis. The implementation of the LR method in crude component-based Monte Carlo (MC) and especially in the setting of classical reliability was first derived. To speed up the...
Modeling and analysis of collaborative maintenance process based on synthesis of Petri net
Yang Yuan, Li Fang, Hou Chongyuan, Yang Lei
2011, 37(6): 711-716.
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To deal with some classical characteristics and problems during collaborative maintenance process such as shared resource constraints, complicated handover about maintenance tasks and uncertain maintaining time, a method based on synthesis Petri net for modeling collaborative maintenance process was...
Simulation on performance and effects of parameters analysis on three-bed OBOGS
Wang Huidan, Lin Guiping, Wang Liang, Fang Ling
2011, 37(6): 717-722,732.
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A set of mathematical models was built and utilized to simulate the performance of three-bed on-board oxygen generation system (OBOGS). Then the results of simulation were compared with the data from experiments and the good agreements were obtained to validate the models and simulation process. Bas...
Base on semi-optical path difference of antenna reflector surface accuracy detection
Zhou Guofeng, Li Xiaoxing
2011, 37(6): 723-727.
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The selection of minimum value of surface fitting is one of the key technologies refer to the antenna panel surface detection. The antenna surface root-mean-square of semi-optical path difference is an index of antenna surface accuracy. A direct calculation method of semi-optical path difference (OP...
Polynomial calibration method for millimeter-wave reflectometer
Zhao Xin, Liu Jinyang, Miao Jungang, Jiang Jingshan
2011, 37(6): 728-732.
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In order to measure the accurate reflection coefficient of waveguide component at millimeter-wave band, a method for reflectometer calibration was proposed. The calibration method was based on a polynomial error model, making the solution of each error term transformed into a problem solving the cen...
Experimental based traffic flow detectors data accuracy evaluation
Zhai Yaqiao, Weng Jiancheng, Rong Jian, Liu Xiaoming
2011, 37(6): 733-737,742.
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Considerable errors exist in the road speed data obtained from various detectors and directly influence the accuracy.Various traffic models were established for estimation. 12 groups of field experiments on different classes- roads by using a test vehicle with global positioning system(GPS) modules ...
Flow and heat transfer characteristics in laminar flow through random rough microchannels
Miao Hui, Huang Yong, Chen Haigang
2011, 37(6): 738-742.
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The flow and heat transfer characteristics of water in laminar flow through random roughness microchannels were investigated numerically. Two random rough microchannels were modeled by a simple method. And another microchannel was designed with periodically distributed roughness for compare. The Re ...
Method based on fuzzy evaluation and GIOWA operator fortechnical risk assessment
Feng Zhen, Deng Zhongmin, Wu Qiang, Huang Xiaofeng
2011, 37(6): 743-747.
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The purpose was to present a qualitative and quantitative integrated approach to assess technical risk in aircraft type development project, with multiple attribute decision making methods introduced into it. A fuzzy syntheses evaluating system based on the generally induced ordered weighted averagi...
Fuzzy parity equation based fault diagnosis approach for PL/INS navigation system
Jin Xing, Song Hua, Qiu Hongzhuan, Wang Yangzhu
2011, 37(6): 748-752.
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A method for multiple faults identification for pseudolite (PL)/ inertial navigation system (INS) tightly coupled navigation system was presented. The failures associated with PL and their modes were analyzed, what is more, fuzzy parity equations were used to identify the PL failure modes. First of ...
Coking properties of aircraft engines- nozzles
Huang Yanfei, Zhu Yuelin, Xiong Changjian, Pan Yingjie
2011, 37(6): 753-756.
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In order to solve the problem of air safety and service lives of the aircrafts with a mass of coking, the properties and micro-morphologies of coking which generated on aircrafts engines- nozzles when aircraft fuel combusted were researched. The properties of coking were characterized by the techniq...

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