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2011 Vol. 37, No. 9

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Harmonic analysis and optimized vibration sensor locations of the helicopter intermediate gearbox
Su Xunwen, Wang Shaoping, Zhu Dongmei, Shi Jian
2011, 37(9): 1049-1053.
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Multi-freedom vibration model has been studied. A methodology of optimized vibration sensor location, in which the amplitude was sensitive to fault frequency, was presented. First, a finite element model of the helicopter intermediate gearbox was constructed, then a signal stimulus was forced to the...
Attitude control of quadrotor aircraft via nonlinear PID
Su Jingya, Fan Penghui, Cai Kaiyuan
2011, 37(9): 1054-1058.
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Based on the nonlinear attitude dynamic and kinematic model of a quadrotor aircraft, an almost globally stabilizing nonlinear proportional integral derivative(PID) attitude controller was developed. The proposed controller consists of a linear PID feedback and a compensation of inertia torques, and ...
Phase coding technology used in MIMO-CDMA system
Wang Xuesong, Yang Xing, Xue Chunmei, Li Daoben
2011, 37(9): 1059-1062,1069.
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In non-rich scattering propagation environment due to lack of angular spreading, non-uniform distribution of singular values of multiple in multiple out(MIMO) system transmission matrix causes a degradation of system capacity. To solve this problem a technology called phase coding was proposed. Phas...
New attitude determination algorithm for single epoch, single frequency using GPS
Qin Honglei, Chen Wantong, Jin Tian, Cong Li
2011, 37(9): 1063-1069.
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The LAMBDA method needs to start with a float solution to the ambiguities, and several epochs are needed by only using phase measurements and it will take a long initial time. To deal this problem, with the special transformation of global positioning system (GPS) carrier phase single difference obs...
Experiment and analysis for cold charging process of new energy storage device
Chi Pengtao, Xie Yongqi, Yu Jianzu, Yang Xianning
2011, 37(9): 1070-1075.
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The heat transfer enhancement effect of the metal foam has been verified by dozens of researches. In order to test the cold charging effect, a new type of high-efficiency energy storage devices was made up by composite phase change material(PCM), which was consisted of copper foam (the heat transfer...
Analysis on composite hydraulic servo control system with dual independent closed-loop
An Gaocheng, Chen Juan, Fu Yongling, Qi Xiaoye
2011, 37(9): 1076-1080.
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In view of the existing hydraulic servo control systems- advantages and disadvantages, a new composite hydraulic servo control system with dual independent closed-loop based on servo motor, definite displacement pump, accumulator and servo valves was put forward with the trend of high performance an...
Mechanical parameters reverse estimation of lunar soil and experimental verification
Li Meng, Gao Feng, Sun Peng, Cui Ying
2011, 37(9): 1081-1085.
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In order to predict and control the traction trafficability of a lunar rover, an algorithm for mechanical parameters estimation of lunar soil based on linear-least squares method was presented to estimate two key mechanical parameters, i.e., internal cohesion and internal friction angle. The improve...
Parser of industrial Ethernet EtherCAT based on XML
Liu Zhe, Huan Ji, Liu Yanqiang
2011, 37(9): 1086-1090.
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The technology and realization method of industrial Ethernet EtherCAT parser based on extensible markup language(XML) were studied. The format of EtherCAT datagram was introduced. The structure of Ethernet probe and parser was analyzed. A method of protocol datagram description based on XML was prop...
Effects of propellants temperature in gas-gas injector inleton combustion performance and wall temperature
Li Mao, Gao Yushan, Jin Ping, Cai Guobiao
2011, 37(9): 1091-1094,1099.
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A combustor with a shear tricoaxial gas-gas injector was researched numerically and experimentally. The influence of propellants temperature in the injector inlet on the combustion performance and wall temperature was investigated and analyzed. The numerical simulation results show that the variable...
LES/RANS hybrid method for supersonic axisymmetric base flow
Gao Ruize, Yan Chao
2011, 37(9): 1095-1099.
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To overcome the limitation of large eddy simulation(LES) for wall problem, LES/RANS hybrid method was investigated in recent years,which not only combined the advantages of LES and RANS but also avoided the disadvantages of each other. Base flow is a difficult problem in CFD. Based on LES/RANS hybri...
ESD damage simulation of integrated circuits by the consideration on parasitic parameters
Lü Weimin, Hu Dong, Ma Jinghua, Xie Jinsong
2011, 37(9): 1100-1104.
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In the traditional electro-static discharge (ESD) damage simulation based on logic circuit, the influence of layout was not taken into account as usual, and there was larger deviation between the results of simulation and the actual damage, so a new simulation method of ESD damage for integrated cir...
Synthetic design on maneuver processes and flight loads of fighters
Cao Qikai
2011, 37(9): 1105-1109.
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The integrated design of maneuver processes and flight loads was investigated for modern fighters. The aeroelastic correction of fight loads and maneuver processes, and maneuver load alleviation were further studied. It indicates that the influences of structural deformation on elastic aerodynamic l...
Dynamical modeling and simulation of rigid-flexible hybrids in large overall motions
Ge Qingming, Guo Jun
2011, 37(9): 1110-1114.
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The coupling dynamics study of spacial flexible structures that takes the coupling efforts into account is of great importance in aerospace field. The flexible structures were discretized by means of finite element method(FEM), and modal matrix of the flexible structures was obtained. The dynamical ...
Real-time programming method for flight path of unmanned vehicle based on dynamic RCS
Yan Qing, Xiong Junjiang, You Siming
2011, 37(9): 1115-1121.
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Simplified radar detection models are applied in conventional flight path programming of unmanned vehicle, in which only the distance between unmanned vehicle and radar has been taken into account, but the dynamic variation of radar cross-section (RCS) with attitude angle of unmanned vehicle has not...
Requirement of ACN and tire press for future large transporter based on allowable load of present airport pavement
Cai Liangcai, Wu Aihong, Li Guangyuan, Li Tianmin
2011, 37(9): 1122-1126.
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In order to make the future large transporter adapt to allowable load of present airport pavement-s requirement, after a great lot of investigations on pavement structure’s type, thickness, allowable load and maximal tire press accepted, advisory value of aircraft classification number(ACN)and tire ...
Impact analysis of targets’ surface to beat-frequency signal in FMCW laser radar
Yang Dezhao, Song Ningfang, Lin Zhili, Ou Pan
2011, 37(9): 1127-1131.
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The characteristics of beat-frequency signal and the accuracy of range and velocity measurement in frequency modulated continuous-wave (FMCW) coherent laser radar were influenced by the surface roughness of measured target. In order to estimate the impact and improve the system-s performance, the sc...
Adaptive parallel simulated annealing genetic algorithms based on cloud models
Dong Lili, Gong Guanghong, Li Ni, Sun Yong
2011, 37(9): 1132-1136.
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Due to the shortcomings of genetic algorithms such as the low convergence rate and premature convergence, an improved genetic algorithms was proposed, called adaptive parallel simulated annealing genetic algorithms based on cloud models (PCASAGA). PCASAGA applied cloud models to the adaptive regulat...
Building extended spirality searching model of dipping sonar of anti-submarine airplane
Wu Fang, Wu Ming, Yang Rijie
2011, 37(9): 1137-1141.
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Based on the omnidirectional moving submarine targets, and the actual searching prcess of anti-submarine airplane, the wind factor affeacting searching prcess was analyzed. Extended spirality searching model of dipping sonar and submarine moving models were built. According to the models of active/p...
Reliability analysis method based on adaptive importance sampling
Ma Jiming, Zhan Xiaoyan, Zeng Shengkui
2011, 37(9): 1142-1146,1150.
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Low efficiency and accuracy problem is serious when analyzing the rare event using Monte Carlo methods, a reliability analysis method was proposed based on the adaptive importance sampling (AIS). Finding the failure points is difficult when the failure equation is not explicit. Firstly a conditioned...
Rotor damping analysis based on helicopter dynamic requirement with rotor/fuselage coupling
Guo Junxian, Xiang Jinwu, Qin Haiying
2011, 37(9): 1147-1150.
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The rotor damping is one of the key points for a helicopter dynamic design. An introduction to the theoretical and practical study of one of the helicopter dynamic problems, which describesd the development of the rotor damping based on the helicopter dynamic with rotor/fuselage coupling that contai...
Modeling and analyzing for testability of hierarchy systembased on multi-signal flow graph model
Lü Xiaoming, Huang Kaoli, Lian Guangyao
2011, 37(9): 1151-1155.
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In order to make analysis for testability of hierarchy system, a testability modeling and analyzing approach were proposed for hierarchy system based on multi-signal flow graph (MSFG). This approach can used MSFG to build hierarchy system-s hierarchy structural mode. Firstly, dependency model was ap...
Three analysis models of torsional frequency of stiffening cylindrical shell
Pan Zhongwen, Xing Yufeng, Yang Yang
2011, 37(9): 1156-1159.
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For simplifying the analysis of stiffening cylindrical shell in rocket, the computational method of torsional rigidity in the area-equivalence method was studied for the stringers in stiffening cylindrical shell, it is shown that the effect of stringers on the torsional rigidity of stiffening cylind...
Allocation mechanism of military aircraft spares based on PHM
Mao Deyao, Zhou Dong, Wen Peiqian, Lü Chuan
2011, 37(9): 1160-1164.
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The existing allocation model of military aircraft spares can-t meet the allocation of military aircraft spares based on prognostics and health management (PHM). First,the generation process of military aircraft spares demand and the existing allocation model of military aircraft spares were formula...
Modeling and control for hydraulic nonholonomic constraint transmission system
Wang Yan, Dong Hongkang
2011, 37(9): 1165-1168,1175.
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Nonholonomic constraint transmission (NCT) is currently driven by a motor, which leads NCT complex and expensive. In the closed hydraulic system composed of concatenate variable pumps, liquid flows continuously and the pump rotate speed is inversely proportional to its displacement. The pump rotate ...
Airport concrete pavement design for large aircraft in future
Wu Aihong, Cai Liangcai, Gu Qiangkang, Li Guangyuan
2011, 37(9): 1169-1175.
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The present concrete pavement design specification uses design aircraft to convert the traffic of other aircrafts into traffic of design aircraft according to the principle of equivalent damage, and it assumes that the wheel path in the lane of runway follows uniform distribution. Actually, wheel pa...
Fast cavity-mode algorithm for analysis of radiation of power bus
Cao Cheng, Su Donglin, Dai Fei, Gao Wanfeng
2011, 37(9): 1176-1180.
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It is very complicated to analyze the power-bus structure of the printed board circuit(PCB). Cavity-mode method is an effective way to analyze the power-bus structure of the printed board circuit, however, the algorithm is hard to converge. Therefore, the total computing time of the algorithm to ana...
Panoramas subspace based scale invariant feature tracking method
Fan Zhiqiang
2011, 37(9): 1181-1185.
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Aiming to panoramas images, a panoramas subspace based scale invariant feature tracking method was proposed which contains an offline process to build feature correspondence between panoramas and original image sequence and an online process to match features based on keyframe recognization. Firstly...
Mechanism of anodizing oxidation film of AZ91D magnesium alloy at low AC voltage
Li Wen, Li Weiping, Liu Huicong, Zhu Liqun
2011, 37(9): 1186-1190.
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A new anodizing process at low AC voltage (10 V) was used to prepare an electrochemical anodized film on AZ91D magnesium alloy in the electrolyte containing NaOH and Na2SiO3. A scanning electron microscope (SEM) with an energy dispersive X-ray spectroscopy (EDS) system was used to study the characte...

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