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2010 Vol. 36, No. 10

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Numerical simulation on dynamic stability of pressure reducing regulator in integral bipropellant propulsion system
Chen Yang, Cai Guobiao, Zhang Zhenpeng, Xia Jixia
2010, 36(10): 1135-1139.
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A finite volume transient model of a high pressure unloading pressure reducing regulator (PRR) with diaphragm, which is used in a integral bipropellant propulsion gas system, was established. Based on this, a modularization numerical model of a characteristic research system for PRR was established....
Approach of pilot modeling for predicting pilot control behavior
Tan Wenqian, A.V.Efremov, Qu Xiangju
2010, 36(10): 1140-1144.
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During the process of aircraft design, the mathematical model of pilot control behavior characteristics is always used to predict aircraft flying qualities.This is one of the important methods to avoid pilot-aircraft adverse coupling. The pilot neural networks (NN) model was derived from experimenta...
GPS signal fast acquisition method aided by inertial information
Lin Heng, Zhang Qiusha, Yang Gongliu, Zhu Lufeng
2010, 36(10): 1145-1148.
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The signal acquisition time affects the performance of global positioning system (GPS) receiver directly under high dynamic conditions. Based on the analysis of traditional acquisition method aided by external information, an improved fast acquisition method was proposed which was aided by inertial ...
Gyroscope aided feature matching method in vision navigation
Xu Chao, Fan Yaozu, Shen Xiaorong
2010, 36(10): 1149-1152.
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In order to solve the problem of feature points mismatching when there is no camera platform in vision navigation, a gyroscope aided points matching method was proposed. The relationship between the output of gyroscope and the coordinate changes of features was built. The nearest cross-correlation m...
Lag-delay robust string stable control of platoon of automated vehicles
Gao Feng, Xiao Lingyun, Wang Jiangfeng
2010, 36(10): 1153-1157.
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Based on the vehicle longitudinal lag-delay dynamics model, the string stability and the control strategies for the automated platoon of vehicles were analyzed and studied. The vehicle longitudinal lag-delay dynamics model was built under consideration of the time delay and time lag. The sliding mod...
Flight loads analysis of flexible aircraft under large deformations
Pan Deng, Wu Zhigang, Yang Chao
2010, 36(10): 1158-1161.
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A flight loads analysis framework was devised to consider the geometrical nonlinear effect and the surface aerodynamic effect for flexible aircraft. The structure consisted of joined nonlinear Euler beams allowing arbitrarily large deformations, while the lifting surface model employed span-wise and...
Preliminary experimental investigation on nitrous oxide/propane igniter
Wang Dong, Guo Hongjie, Liang Guozhu, Liu Yin
2010, 36(10): 1162-1165.
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To investigate the ignition characteristics of nitrous oxide/propane, the torch igniter scheme of N2O/C3H8 was proposed initially. An igniter was designed and manufactured, and the experimental system was designed. The hot-tests under different condition of mass flow and excess-oxidizer coefficient ...
Numerical simulation of atomization of liquid jet in supersonic crossflow
Liu Jing, Xu Xu
2010, 36(10): 1166-1170.
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Liquid jet atomization in supersonic crossflow was simulated using Euler-Lagrangian method. Euler method was used for gas phase and Lagrangian method was used for liquid phase. The liquid influences were calculated by source items in gas equations. The atomization process was simulated using the hyb...
Modeling and performance analysis of multiple-antennae communication channel for pilotless helicopter
Tan Zheng, Zhang Xiaolin
2010, 36(10): 1171-1175.
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A statistical channel model for the pilotless helicopter multiple-antennae communication was derived based on the single-antenna aeronautical channel model. Characteristics of delay spread, Doppler spread and angular spread were discussed. Mask effect of fuselage and interference of the multiple-ant...
Statics analysis on the leg of water strider robot
Wang Shuhui, Wu Licheng
2010, 36(10): 1176-1179.
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As a bionic robot of the water strider, water strider robot stays afloat and stride on water surface relies on surface tension provided by the legs. Statics analysis could be used to calculate the robot-s load capacity and then to define the criterions for designing the supporting leg. A static mode...
Improved immune algorithm and applications on function optimization
Sun Xuegang, Yun Chao, Cui Yihui
2010, 36(10): 1180-1183.
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Abstract:
A novel eccentric dynamic immune clone algorithm (EDICA) was proposed based on the analysis of antibody behavior features in existed clone selection algorithm (CSA). Heuristic information implicates that descendant antibodies are always better than their parents during evolution, which derive an ecc...
On the high stress gradient and failure analysis of dovetail attachments
Wei Dasheng, Wang Yanrong
2010, 36(10): 1184-1188.
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Studies reveals that high stress gradient exists near the edges of contact in dovetail attachment, of which the numerical solution to contact stress depends on finite element (FE) mesh density. So a set of FE models with different mesh of dovetail attachment were used to analyze the effect of FE mod...
Structure selection and parameter set-membership identification for nonlinear systems
He Liqing, Sun Xianfang, Qiu Hongzhuan
2010, 36(10): 1189-1193.
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Based on support vector regression and radial basis function (RBF) neural network, the set-membership identification for nonlinear systems with unknown-but-bounded noise was investigated. The relationships among the ε-insensitive parameter, noise bounds and the number of support vectors were deduced...
Sliding mode control based on proportion allocation for over-actuated saucer-shaped aircraft
Zhang Youan, Wu Yinsheng
2010, 36(10): 1194-1198.
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In order to avoid some actuators saturation in advance, a proportion control allocation strategy was proposed in over-actuated saucer-shaped aircraft under position limits. The proportion was defined by the lower and upper position limits of the actuators. With the strategy, the system with two inpu...
Analysis on electrostatic levitation of lunar dust on the Moon's light side
Li Wen, Cui Yi, Wang Jun, Zheng Weilin
2010, 36(10): 1199-1202.
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The electrostatic charging process of lunar dust particulate on the moon-s light side was modeled based on particle orbit theory and charging equation of space dusty plasma. Assuming a Maxiwellian distribution of photoelectron energies, the formulae of strength of vertical electric field as well as ...
Novel evaluation method of time base distortion of nonuniformly sampling data acquisition systems
Liang Zhiguo, Meng Xiaofeng
2010, 36(10): 1203-1206.
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By using both the time base differential non-linearity and integral non-linearity,a novel method to evaluate the time base distortion is presented, which deal with the nonuniformly sampling data acquisition systems. By using sinusoidal stimulating, and then re-sampling the data to create sub-series ...
Modeling of emergency management in altitude simulation testing with Petri net and its application
Ma Feng, Qiu Wanhua
2010, 36(10): 1207-1212.
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Abstract:
An emergency management workflow strategy was constructed for altitude simulation testing, and a Petri net model of the strategy was modeled. The model mainly comprises an urgency stop program and a crisis stop program. The urgency stop program is aimed to ensure safety of the tested engine and the ...
Glass forming ability and thermal stability of Zr-Al-(Ni-Cu) alloys
Zhang Jing, Zhang Tao
2010, 36(10): 1213-1216.
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Glass forming ability (GFA) of Zr-Al-(Ni-Cu) alloys with different Ni and Cu element contents was studied by injection copper mold casting method. Structures of the as-cast alloys, sliced along the cross-section, were identified by X-ray diffraction (XRD). Thermal properties of the bulk metallic gla...
Influence of boron and carbon on the shrinkage defects of TiAl alloys
Gao Yong, Yang Lili, Zheng Lijing, Zhang Hu
2010, 36(10): 1217-1220.
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Alloys whose nominal compositions were Ti-47Al-2Cr-2Nb, Ti-47Al-2Cr-2Nb-0.8B and Ti-47Al-2Cr-2Nb-0.1C were vacuum induction skull melted. Ingots were produced by pouring the molten alloys into a room-temperature graphite mold. Chemical compositions of ingots obtained were analyzed respectively. Micr...
Detection of Australian southeast forest fire using HJ satellite
Li Jiaguo, Gu Xingfa, Yu Tao, Wei Bin
2010, 36(10): 1221-1224.
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By detecting forest fire happened in Australian southeast from remote sensing imagery to demonstrate the application ability of HJ-1B satellite in disaster. After analyzing the character of HJ-1B IRS B07 system parameters and data trait, a normalized forest fire index, Ku, was constructed. Pixels ar...
Change estimation of damage with acoustic emission nonlinear behavior model
Wang Hongwei, Luo Hongyun, Han Zhiyuan, Zhong Qunpeng
2010, 36(10): 1225-1228.
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An acoustic emission nonlinear behavior model which consists of acoustic emission (AE) cusp and review model was established, which can estimate the changed time at which the state of 16Mn steel was changed from elastic deformation to yield deformation. Firstly, some preliminary changed time at whic...
Bias and scale factor drift modeling methods for accelerometers
Huang Xiaokai, Chen Yunxia, Kang Rui
2010, 36(10): 1229-1233.
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Abstract:
Engineering data modeling methods and their application features were summarized, Combine with the accelerometer bias and scale factor drifting law of experimental measurements in storage conditions, bias time series analysis method and scale factor regression methodology were established respective...
Standardization benefits assessing model of complicated production development program
Hu Qianhong, Chu Hengzhi, Liang Defang, Lü Juan
2010, 36(10): 1234-1238.
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To quantify the benefits of standardization calculation,highlight the important role of standardization, the accounting method of the standardization work weight was determined, and the standardization work system and benefits index system were established. By analyzing the characteristics of the st...
Effect of temperature on corrosion and scaling of galvanized steel pipe in simulated geothermal water
Wu Kunhu, Li Weiping, Liu Huicong, Zhu Liqun
2010, 36(10): 1239-1243.
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Steel pipe corrosion and scaling is a universal problem in the geothermal water environment. Scanning electron microscopy (SEM), energy dispersion spectrometry (EDS) and X-ray diffraction (XRD) were used to study the corrosion and scaling behavior of galvanized steel pipe in a simulated geothermal w...
Operation mode design of multi-FOV star sensor
Ye Shenglong, Wei Xinguo, Fan Qiaoyun, Zhang Guangjun
2010, 36(10): 1244-1247.
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Two operation modes, namely high precision operation mode and high update operation mode, were designed in view of the characteristics of the multi-filed of view(FOV) star sensor. The central timing controller accomplish its operation mode configuration according to the instructions and starts image...
Improved 3-D real-time trajectory planning algorithm for UAV
He Pingchuan, Dai Shuling
2010, 36(10): 1248-1251.
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It is of vital importance to plan trajectory for unmanned aircraft vehicle (UAV) completing missions in battlefield. A method to address the real-time problem of low-altitude UAV 3-D trajectory planning in realistic battlefield was proposed. Simplified threat models of battlefield were constructed, ...
Searching and tracking ground target UAV flight control system design
Wang Yang, Liu Wei
2010, 36(10): 1252-1255.
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According to a high aspect ratio and V-shaped empennage unmanned aerial vehicle (UAV), a flight control strategy based on searching and tracking ground target was researched. A control method was designed with which a single-axis camera detecting system eliminated vertical error and UAV heading cont...
Analysis of depth testing model for thin board specimen in pulsed thermography
Wan Kai, Ma Qishuang
2010, 36(10): 1256-1260.
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Pulsed thermography (PT) is always considered as a quantitative testing approach in infrared thermal imaging. One of its main models called temperature-contrast function (TCF) method is usually found invalidated in defect depth measurement when meets a thin sample. To exhibit the existing fault duri...

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