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2011 Vol. 37, No. 3

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Application of super-heterodyne phase-sensitive detector in electromagnetic acoustic testing
Zhou Zhenggan, Huang Fengying, Ni Xiansheng
2011, 37(3): 253-258.
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In order to increase the signal-to-noise ratio of the electromagnetic acoustic received signal,an electromagnetic acoustic inspection system based on super-heterodyne receiver orthogonal phase-sensitive detection technique was designed and applied to inspect samples of aluminum, carbon steel and sta...
Analysis of glint characters of complex coated target
Fang Ning, Wang Gu, Wang Baofa
2011, 37(3): 259-262.
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Appropriate coating material can reduce the back radar cross scatter of air target, at the same time, it may affect the glint of target greatly. To study this affection, first, through physical optics and impedance boundary condition the radar cross section(RCS)was obtained in graphic electromagneti...
Error model analysis of 2-RSSS spatial mechanism
Chen Pei, Wang Xing
2011, 37(3): 263-267.
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The position error sources of a low speed 2-RSSS spatial mechanism were studied. Firstly, error model of this mechanical system was built considering realistic joint characteristics, namely, joints with clearance was presented. A simplified model was built under the assumption of two-force principle...
Threshold setting method for GPS signal acquisition under cross-correlation effect
Liu Yang, Qin Honglei, Jin Tian
2011, 37(3): 268-273.
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Traditional global positioning system(GPS) signal acquisition threshold method suffers from large false alarm ratio in the condition of cross correlation interference, and thus influences weak signal acquisition. This problem was analyzed and signal acquisition detector was improved under the situat...
Dynamic optimization method for valve plate structure of aviation piston pump
Guan Changbin, Jiao Zongxia
2011, 37(3): 274-278.
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Through the discharge area of aviation piston pump was calculated accurately, and the compressibility of oil and leakage of cylinder were considered, the nonlinear mathematical model of instantaneous flow rate was established. A dynamic optimization method of valve plate structure was proposed based...
Novel calibration method for emissivity measurement of radiometer calibration load
Li Zhiping, Miao Jungang, Bai Ming
2011, 37(3): 279-282.
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A novel bistatic measurement for calibration load used in prelaunch calibration for microwave radiometer carried on the Feng-Yun series satellite was preposed. The pyramidal metal calibration target which has the same structure to the periodic calibration load to be measured was introduced. Based on...
Helicopter rotor tuning based on neural network and particle swarm optimization
Liu Hongmei, Lü Chen, Ouyang Pingchao, Wang Shaoping
2011, 37(3): 283-288.
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Considering the drawbacks of traditional rotor adjustment method without calculating possible nonlinear between rotor adjustments and fuselage vibration signals of the helicopter, a new rotor adjustment method based on the general regression neural network (GRNN) and the particle swarm optimization ...
Influence of carrier motion on landing safety for carrier-based airplanes
Xu Dongsong, Liu Xingyu, Wang Lixin
2011, 37(3): 289-294.
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The landing safety grading standard was summarized for carrier-based airplanes. The influence of carrier motion such as navigation, wobble and surge due to wave on landing safety was researched and the best carrier navigation velocity cooperated with carrier-based airplane approach velocity was give...
Numerical simulation on aerodynamics of airfoil flying over wavy water surface
Qin Xuguo, Liu Peiqing, Qu Qiulin
2011, 37(3): 295-299,304.
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Aerodynamic characteristics of an airfoil NACA2410 in flight being close to wavy water surface are investigated numerically. The Reynold average Navier-Stokes(RANS) equation of unsteady incompressible flow, the standard k-ε turbulence model and volume of fluid(VOF) method were solved. Appropriate me...
Numerical simulation of three dimensional wall temperature of combustor liner based on thermal-fluid-solid coupling method
Gao Jinhai, Wang Jianjun, Ma Yanhong, Hong Jie
2011, 37(3): 300-304.
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It is the premise and basis of thermal structure analysis to determine the temperature distribution of combustor liner. The three dimensional temperature distribution of a combustor liner was captured by the numerical simulation of an annular return-flow combustion chamber with ANSYS/CFX based on th...
Mission planning of multiple UCAV based on DTC and GPGP
Zhao Zhenyu, Lu Guangshan, Liao Mo, Chen Zongji
2011, 37(3): 305-310.
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Task analysis, environment modeling, and simulation(TAEMS) was used as task structure model for uninhabited combat aerial vehicle(UCAV). The UCAV task structure model was presented and UCAV mission planning was defined and described based on TAEMS. A mission planning algorithm based on heuristic des...
Aerodynamic characteristic of canard rotor/wing aircraft in conversion
Li Yibo, Ma Dongli, Niu Lingyu
2011, 37(3): 311-315.
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The aerodynamic characteristics and mechanism of canard rotor/wing(CRW) aircraft during conversion from rotary to fixed-wing flight was numerically investigated. The variation of forces, moments and aerodynamic center with respect to rotor position are presented, the amplitude of lift, drag and aero...
Modal tests and properties analysis on truss structure of large scale carbon fiber
Tao Guoquan, Wei Yuchen, Lü mingyun, Wu Zhe
2011, 37(3): 316-319.
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Based on stochastic subspace system identification method,the modal properties of the truss structure of large scale, light weight, high strength, and force bearing type carbon fiber composites were investigated by ambient excitation. On basis of the characteristics of the truss structure itself, th...
Flow characteristic and starting method for divergent dual throat nozzle
Eriqitai, Deng Shuangguo, Li Jiajun
2011, 37(3): 320-324.
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The flow characteristic and starting method of two-dimensional divergent dual throat nozzle were studied numerically. The results show that there will be normal shock waves in the divergent zone of the dual throat nozzle, which result in great loss in total pressure and choke at the second throat, t...
Effects of software test efficiency on software reliability demonstration testing effort
Li Qiuying, Li Haifeng, Wang Jian
2011, 37(3): 325-330.
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To solve the problem that in the traditional software reliability demonstration testing(SRDT), software testability was not considered as one of the possible influence factors on test effort, a method which introduced test efficiency to improve the quantity model of minimal sample size in SRDT was p...
Support generation design for rapid prototyping of functionally gradient material objects
Wang Su, Hu Haiou, Liu Heng, Zhu Xinxiong
2011, 37(3): 331-336.
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Rapid prototyping technology makes the manufacturing of functionally gradient materials objects come true for its digital concurrent design and manufacturing. The design of supporter generation defines the machining accuracy of functionally gradient material(FGM)parts in the process of rapid prototy...
Dynamic performance of three kinds of supply chains based on control theory
Wang Jing, Lü Guoli, Jia Jingdong
2011, 37(3): 337-343.
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Based on the APIOBPCS (automatic pipeline, inventory and order based production control system), three kinds of two-echelon supply chains were established using the discrete control theory: traditional, demand information sharing and vendor managed inventory two-echelon supply chain. It developed th...
Design and hydrodynamic experiments on robotic fish with oscillation pectoral fins
Gao Jun, Bi Shushing, Li Ji, Cai Yueri
2011, 37(3): 344-350.
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A robotic fish propelled by a pair of pectoral fin with oscillation motion was proposed, and experiments were carried out to study the hydrodynamic characteristic. Based on the analysis of motion feature and skeletal structure of pectoral fin of cownose ray, a kind of robotic cownose ray actuated by...
Investigation of aviation oxygen regulator
Wan Yuqin, Zhao Jingquan, Zeng Yu
2011, 37(3): 351-354.
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The working principle of the two components(pulmonary-based institutions and air intake body of oxygen regulator) was presented, and the mathematical model was established based on the analysis of the balance of the imposed forces on the kinetic components. The numerical simulation was implemented t...
Simulation platform design for space intercept
Liu Zhe, Dong Changhong, Han Chao
2011, 37(3): 355-359.
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It is important for system simulation to build up a simulation platform. A simulation platform scheme, which was able to integrate varied space intercept missions,easy to extend,and with perfect visualization ability, was presented. The hiberarchy of the platform, main functions of each layer, and r...
One sneak circuit analysis method for the switch circuit
Xu Ping, Ma Qishuang, Zou Tao
2011, 37(3): 360-363.
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The switch circuit was modeled by graph theory model. The function edge and the switch edge were two important factors in the sneak circuit analysis. The two states of edge were represented by the edge state variable.The characters of the interface in the circuit were studied and the sneak circuit a...
Prediction of tool VB value based on PCA and BP neural network
Nie Peng, Chen Xin
2011, 37(3): 364-367,373.
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Five layers of wavelet decomposition was applied on acoustic emission signals for extracting the acoustic emission(AE) signals energy value of six bands. Energy value and cutting speed, cutting depth, feed rate, cutting time were turned into state feature vectors of tool wear. The principal componen...
Supercritical airfoil parameterization method feasible to optimum design
Deng Jinqiu, Feng Renzhong
2011, 37(3): 368-373.
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To reduce the number of design variables in the supercritical airfoil optimization, eliminate the unfairness phenomenon, ensure C2 condition, control the geometric characteristics of the airfoil in the optimization process, a parameterization method for supercritical airfoil based on four rational B...
Reliability optimization of standby phased mission systems based on desirability function
Yu Jian, Hu Tao, Yang Chunhui
2011, 37(3): 374-378.
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A phased mission system to be a success, the system must successfully operate throughout all of the phases. A reliability computative model of cold-standby phased mission systems was proposed based on the reliability computative model of cold-standby systems, its components have two states and the t...

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