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2011 Vol. 37, No. 12

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Assessing step-down stress accelerated degradation data via nonlinear accelerated model
Yao Jun, Zhong Weiqiang
2011, 37(12): 1475-1478.
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A segmented nonlinear accelerated degradation model (SNADM) was introduced based on the equivalent method of accumulative damage theory, which tackles the problem that product life is difficult to determine with degradation rate being a function of the variable of time. A segmented expression of the...
Novel method of multiple-satellite faults exclusion for global navigation satellite system
Chen Canhui, Zhang Xiaolin
2011, 37(12): 1479-1483.
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In global navigation satellite system (GNSS), with the increase in the number of observational satellites comes an increase in the probability of simultaneous multiple-satellite faults. Therefore, the multiple-satellite faults should be taken into account in receiver autonomous integrity monitoring ...
Dynamic buckling failure analysis of rod with uncertain initial geometrical imperfection
Wang Xiaojun, Wang Lei, Ma Lihong, Qiu Zhiping
2011, 37(12): 1484-1489,1509.
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It can be found from some data that the buckling load of structure may decrease by 70 percent due to the existence of initial geometric imperfection.The initial geometric imperfection may be uncertain due to the manufacture errors and so on, so this will lead to the uncertainty of the buckling load ...
Scene matching semi-physical simulation system based on 6 degree of freedom manipulator
Zhao Long, Li Tiejun
2011, 37(12): 1490-1493.
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In order to overcome the limitations of traditional scene matching semi-physical simulation system, a new scheme of the semi-physical simulation system was proposed for airborne scene matching. The aircraft motion state has been simulated by using motion of 6 degree of freedom manipulator and large ...
Turbine blade DR images fusion based on bi-energy X-ray radiography
Yang Min, Wu Meijin, Wei Dongbo, Li Xingdong
2011, 37(12): 1494-1497.
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In order to increase the single frame digital radiography(DR) image information of the turbine blade, two DR images were captured at different X-ray energy so as to get the turbine blade quality information at different thickness region firstly. Secondly, the two original DR images were decomposed b...
Validation of two-dimensional axisymmetric plume model for ion thruster
Ren Junxue, Wang Yan, Qiu Qian, Tang Haibin
2011, 37(12): 1498-1503.
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In order to understand the distribution and flow characteristic of ion plume especially the charge-exchange (CEX) ions, the ion thruster plume model was established and a numerical simulation using the particle-in-cell method was adopted to obtain CEX ions distribution in the plume. The calculation ...
Novel rapid acquisition algorithm for hybrid DS/FH spread spectrum systems
Wen Xiaojie, Zhang Yanzhong, Shao Dingrong, Li Shujian
2011, 37(12): 1504-1509.
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To improve the mean acquisition time performance of hybrid DS/FH spread spectrum systems, a rapid acquisition algorithm based on alterable frequency hopping rate was proposed. The unaligned states frequencies were excluded to fast decrease mean acquisition time, while the acquisition was declared af...
Time series prediction using neuron-expanding regularized extreme learning machine
Zhang Xian, Wang Hongli
2011, 37(12): 1510-1514.
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A new algorithm called neuron-expanding regularized extreme learning machine (NERELM) was proposed and applied to time series prediction. In order to enhance the generalization performance of NERELM, the empirical risk and the structural risk were balanced on the basis of structural risk minimizatio...
Experiments of aluminum migration of power silicon transistor using planar process
Lü Weimin, Hu Dong, Xie Jinsong, Weng Lu
2011, 37(12): 1515-1518.
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Experiments have been carried out on to study a phenomenon of aluminum migration across a 50 micron semi-insulation gap on the die surface of a power silicon transistor under a high-intensity electric field, which is manufactured using a typical planar process with aluminum as the metallization mate...
Multi-target detecting and positioning approach of mobile robot based on ultrasonic sensors
Wang Guofu, Gao Feng, Yang Xinhong, Cui Ying
2011, 37(12): 1519-1523.
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To make mobile robot detect and locate scattered multi-targets accurately, a new intelligence measurement approach based on ultrasonic sensors was proposed. An array of three ultrasonic transceivers was employed to transmit approximate plane acoustic beam, and space coordinates were built. Three sen...
Conversion relation of detail fatigue rating based on different fatigue life distribution
Dong Yanmin, He Xiaofan, Liu Wenting
2011, 37(12): 1524-1528.
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Due to the difference of usage, loading, structure, reliability requirement, and so on, the definition of military aircraft structure detail fatigue rating is different from civil aircraft structure which mainly varies in the fatigue life distribution functions and basic structure. The number of det...
High order accurate methods in numerical simulation of hypersonic heat transfer
Jiang Zhenhua, Yan Chao
2011, 37(12): 1529-1533.
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Influencing factors of hypersonic heat transfer simulation were studied with the blunt cone model. The connection between heat transfer computation and wall-normal grid Renolds number was established. Stable and accurate heat transfer result was acquired with high-order interpolation methods. A vari...
Applicability of shrinkage porosity prediction for casting with Niyama criterion
Pan Liwen, Zheng Lijing, Zhang Hu, Gao Wenli
2011, 37(12): 1534-1540.
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The macroscopic shrinkage cavity and porosity of the TiAl alloy crisscross and clintheriform casting was predicted by the finite element casting simulation software ProCAST with Niyama criterion. The prediction results were tested by experiment. The results show that for the Ti-47Al-2Cr-2Nb alloy cr...
Genetic algorithm based optimal design for dual-redundancy brushless DC motor
Wu Zhiyong, Guo Hong, Lü Zhenhua, Qian Hao
2011, 37(12): 1541-1545,1568.
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A genetic algorithm (GA) based global optimization for a dual-redundancy brushless DC motor (DR-BLDCM) used in aviation actuators was presented. The aim of the optimal design is to reduce the weight of the motor. First, the objective function was established based on the electromagnetic and thermal ...
Security evaluation of nose wheel steering systems based on GSPN methods
Zhao Zhe, Jia Yuhong, Zheng Xin, Zhou Yutian
2011, 37(12): 1546-1551.
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To solve the problem of how to evaluate the safety of a system without relative statistical data, the generalized stochastic petri nets(GSPN) and classical evaluating method were hung together. Taking a certain type of airplane's nose wheel steering system, which was still at the stage of design, as...
Dual-stage pressure control and efficiency analysis of motor-pump-valve coordinated control actuation system
Fu Yongling, Zhang Weiwei, Ji Youzhe
2011, 37(12): 1552-1556,1584.
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Based on the low efficiency and the significant heat loss of the aircraft actuating system, the relationship of pressure and efficiency was analyzed in the motor-pump-valve coordinated control actuation system. The method of the dual-stage pressure energy-saving control was proposed, that was, the d...
Knowledge representation for CNC equipment fault diagnosis system based on CBR
Chen Youdong, Han Meihua, Ye Jinjun
2011, 37(12): 1557-1561.
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As the computer number control (CNC) become more and more complexity, there is a great demand for fault diagnosis and maintenance system to improve the efficiency of failure diagnostics and maintenance. The case-based reasoning (CBR) has been broadly applied in fault diagnosis. However the case base...
General model for PMS reliability
Yang Chunhui, Yang Jianjun, Yao Lu
2011, 37(12): 1562-1568.
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The hypothesis of reliability model of phased mission systems (PMS) was summed up, and then the shortcoming was also presented that analytical model of PMS is difficult to describe and calculate the complex system, at the same time the simulation model is also hard to be set up. By using the colored...
Object-driving software testability measurement
Fu Jianping, Liu Bin
2011, 37(12): 1569-1574.
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To reduce the difficulty and cost of software testability measurement, an object-driving method was proposed to measure the testability of various programs by a unified manner. It is based on a software testability metrics framework that consists of the testability metric, testable characteristics m...
Fuzzy comprehensive evaluation in FMECA of electro-hydraulic servo valve
Dai Chengguo, Wang Xiaohong, Zhang Xin, Wang Lizhi
2011, 37(12): 1575-1578.
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According to the limited analysis of the whole system or product and the unreasonable weight distribution of the failure risk, occurrence probability and detective difficulty, the fuzzy comprehensive evaluation was proposed to optimize the failure modes, effect and criticality analysis(FMECA) of the...
Design of radiometer for thermal control coatings in situ measurement
Xing Hui, Zhao Huijie, Zhang Ying, Zhang Qingxiang
2011, 37(12): 1579-1584.
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To solve the problem of thermal control coatings degradation in space environment, it is necessary to study coatings degradation law in simulated space environment, thus a radiometer design based on calorimetry was proposed for in situ measurement of thermal control coatings solar absorptance. The r...
Method of realtime hill-shading in digital earth system
Yang Hailin, Wang Jiaxin
2011, 37(12): 1585-1588.
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Hill-shading terrain effects, which are high precision and real-time dynamic, were achieved on global terrain in the digital earth simulation system developed. It was realized by using the normal map mode without increasing the number of terrain grid. The elevation data was processed to level of det...
Mahalanobis distance-based semi-supervised discriminant analysis for face recognition
Shi Jun, Chen Caikou
2011, 37(12): 1589-1593.
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To address the problems that there is often no sufficient class-label information of face samples in face recognition application and some relativity also exist among face sample features, a semi-supervised discriminant analysis based on Mahalanobis distance was presented. The method makes use of th...
Analysis of oversteer/understeer characteristics of aircraft ground steering
Zhu D, an
2011, 37(12): 1594-1598.
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A lower-order equivalent aircraft steering system model with time-varying parameters was developed to analyze oversteer/understeer characteristics of aircraft steering and improve handling characteristics of nose wheel steering system after touchdown. Combining system stability analysis with flight ...

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