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2004 Vol. 30, No. 07

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Requirement pattern
Sun Zian, Zhou Bosheng
2004, 30(07): 583-587.
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In order to resolve the problem of requirement reuse during software development process, activity graph in unified modeling language(UML) was extended to be applied to modeling for software requirement capturing and describing. Description language of requirement pattern based on process model was ...
Optimization design of brushless DC motor for flight control
Wang Ziqiang, Zhang Long, Huang Y
2004, 30(07): 588-592.
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Abstract:
Development of electromechanical actuation system for flight control is one of the most important technologies in the path to all-electric airplane. Brushless DC motor of high speed and high power density is the key in the system. In order to solve the problem of non-liner optimization, the genetic ...
Measurement of horizontal load subjected to aeroplane undercarriage tyre
Shi Haiwen, Xing Yufeng, Fu Yonghong, Zhang Daqian
2004, 30(07): 593-596.
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The mathematic model of predicting the horizontal load subjected to aeroplane undercarriage tyre based on the drop-tests was built by analyzing dynamic loads acting on drop-test platform which is supported by three-poles, and the coefficients in the mathematic model were determined by means of the l...
Computational analysis of two fluidic thrust-vectoring concepts on nozzle flow field
Luo Jing, Wang Qiang, Eriqitai
2004, 30(07): 597-601.
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Two-dimensional internal flow field of thrust-vectoring nozzles was calculated at two fluidic thrust-vectoring concepts of shock vector control and fluidic throat skewing. Base on the partition method of quadrangular structured meshes which were densified partly, the Navier-Stokes equation was solve...
Processing model of rake and flank faces of ball-end cutters with a virtual axis grinding machine
Pei Baoqing, Luo Xueke, Chen Wuyi
2004, 30(07): 602-605.
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The process to grind ball-end cutter is the most complex in all the tool grinding processes, especial for the rake faces and flank faces of the cutter. They are the research hotspot now. The structure of the virtual axis machine is different from the conventional machine. So its movement control cha...
Computer simulation of residual stress for cold rolling prestrectching board
Zhao Lili, Zhang Yidu
2004, 30(07): 606-609.
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Abstract:
To eliminate the residual stress formed during the process of Al board cold rolling, the distribution of stress in the deformation region was stimulated by elas-plastics large deformation finite element analysis. Analyzing the effects towards residual stress from different rolling loadcase, the valu...
Design and implementation of materialized cubes genetic algorithm
Sun Huiqin, Xiong Zhang
2004, 30(07): 610-613.
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Abstract:
Multidimensional data cubes are composed of base cube and other cubes aggregating on base cube. Since response time should be small, query optimization is critical. Materializing multidimensional cubes is a good solution. Partial materialization gives some good tradeoffs between the storage space us...
Analysis of time-domain modes in FDTD-diakoptics
Yang Zhengguang, Su Donglin, Li Mei, Lü Shanwei
2004, 30(07): 614-617.
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Abstract:
It is very important to choose proper time domain modes when microwave structures were analyzed by time domain Diakoptics. Two dimensional Bessel functions is proper time domain modes in time domain Diakoptics. One dimensional Bessel functions expand theorem was extended to two dimensional, the comp...
Multi-access interference suppression in DS/FH communication system
Liu Jicheng, Shao Dingrong
2004, 30(07): 618-622.
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Abstract:
According to the thought of multi-users detection(MUD)used in direct sequence code division multi-access (DS-CDMA) system, partial parallel interference cancellation(PPIC) technology was put forward to suppress multi-access interference(MAI) in direct sequence/frequency hopping spread spectrum multi...
Negative drag phenomena of aircraft in dynamic pitching process
Guo Hui, Lian Qixiang
2004, 30(07): 623-626.
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Abstract:
Aerodynamic characteristics of a simplified aircraft model pitching with constant pitch rate were studied in a water tunnel. Dynamic force measurement and flow visualization were made simultaneously. The three-component forcemeasurement balance was internal type and fixed to the sting, and the flow ...
Performance analysis of linear clustered aerospike nozzles
Wang Changhui, Liu Yu, Qin Lizi
2004, 30(07): 627-630.
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Abstract:
To investigate the performance of optimized aerospike nozzles, the effects of thermal parameters variation in gas flow on aerospike nozzles performance, and to compare the altitude characteristics of bell nozzle and aerospike nozzles with the same area ratio, a numerical program was developed by emp...
Effect of virtual coupling cell to the haptic system
Luo Yangyu, Wang Dangxiao, Zhang Yuru
2004, 30(07): 631-634.
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Abstract:
The influence of virtual coupling cell on the stability and transparence of force interaction system was discussed, under the information flowing mode of impedance display. According to their special physical character, individual spring or damping cell is in series or in parallel connection with di...
Interaction between laser and propellant gas
Zhu Dingqiang, Zheng Liming, Cai Guobiao
2004, 30(07): 635-639.
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Abstract:
Base on the characteristic of laser propulsion, an investigation was performed to find out the mechanism of the interaction between laser and propellant gas. The breakdown process of propellant gas was studied, calculation method of breakdown threshold value was obtained, the breakdown threshold val...
Lead and lag correction in vehicle navigation system
Zhuang Chaowen, Fu Li, Teng Jitao, Fan Yuezu
2004, 30(07): 640-643.
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Abstract:
The reasons were analyzed ,which caused lead and lag errors in vehicle navigation system. A new method was proposed, which using map matching(MM)to correct lead and lag errors in global positioning system/dead deckoning system(GPS/DRS) integrated navigation system. The method made lead and lag error...
Methods of realization of multilevel intelligent decision-making in CGF
Qu Xingda, Gong Guanghong, Wang Xingren
2004, 30(07): 644-647.
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Abstract:
To model senior commanders’ decision-making, a method based on likelihood ratio was adopted, and for junior commanders, a method based on fuzzy logic was employed to model their decision-making. The method based on likelihood ratio could fuse the information from different sources so as to make a re...
Parametric correcting method for dynamic mathematical model via dynamical response
Luo Zhangping, Xiang Jinwu
2004, 30(07): 648-651.
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Abstract:
Improvement of structural dynamical model using dynamical response was studied. The approach is correcting physical parameters of given finite element model using experimental steady displacement responses. The mathematical model for model updating was constructed through the constitutive relations ...
Combined house of quality oriented product planning
Wang Meiqing, Tang Xiaoqing
2004, 30(07): 652-656.
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Abstract:
Product planning requires accurate and integrated planning information. A combined house of quality (CHOQ) oriented product planning was presented. The CHOQ consists of quality house of customer requirements (CRs), quality house of product technical characteristics (PTCs) and complex house of qualit...
Computation of cryogenic propellant discharge under zero gravity conditions
Tian Hui, Sun Bing, Gu Hongxia
2004, 30(07): 657-661.
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Abstract:
The discharge research of the residual cryogenic propellant used in the CZ-3A third sub class was studied. The liquid hydrogen and liquid oxygen cryogenic propellant flow inside of the two different discharge pipeline was calculated. The liquid propellant will be vaporized, which attributes to the p...
Parametric faults detecting with multi-frequency test applied in ATE
Zhang Wei, Shen Shituan, Li Yihua
2004, 30(07): 662-665.
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Abstract:
Assisted with the sensitivity of the linear analog circuits, the feasibility of parametric faults detection was analyzed through the maximum fault errors acquired at the sensitive frequencies, a stimulation matrix and its stimulation expression were put forward on the test points information. A unit...
Non-interference test method of embedded system software
Zhang Jiong, Jin Huihua, Shang Lihong, Chang Sheng
2004, 30(07): 666-669.
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Abstract:
Traditional test methods of embedded system software impose on the object system and the result of the test are not accurate enough as expected. Non-interference test (NIT) method can solve the problem. Not same with the traditional test methods, NIT is completely non-interference to the object soft...
Collision avoidance algorithm based on ANFIS
Xu Aiguo, Gao Feng, Wang Jian, Zhang Liling
2004, 30(07): 670-673.
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Abstract:
A vehicle collision avoidance model was established according to adaptive neuro-fuzzy inference system. In order to improve rapidity of convergence, a hybrid algorithm was proposed. For some linear parameters such as consequent parameters, recursive least square algorithm was used to update it. For ...
Web-oriented knowledge description language
Wang Xianghua, He Jian, Qin Zheng, Jia Xiaolin
2004, 30(07): 674-678.
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Abstract:
An XML-based and ontology-supported knowledge description language (KDL) was first presented, which has three-tier structure(core KDL, extended KDL and complex KDL), and takes advantages of strongpoint of ontology, XML, description logics, frame-based systems. The XML-Based syntax of KDL was introdu...
Calculation method of source terms in high temperature chemical nonequilibrium flows
Ma Hui, Wang Famin
2004, 30(07): 679-681.
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Abstract:
In the numerical simulation of hypersonic chemical nonequilibrium flows, species density may become negative at the beginning of calculation, chemical stiffness is the main reason that affects the calculation’s stability and convergence. Based on the basic theory of source term’s linearazition, two ...
Interval analysis method for vibration of composite laminate with uncertain parameters
Qiu Zhiping, Ma Yi, Wang Xiaojun
2004, 30(07): 682-685.
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Abstract:
A new method named interval analysis method, which solves the natural frequencies of composite laminate with uncertain parameters, was presented. Based on interval mathematics and Taylor series expansion, interval analysis method simplifies the uncertain parameters to interval vectors so that it can...
Design of solution for network security authentication with EPASS1000
Xiao Mengqiang, Wang Chengjun
2004, 30(07): 686-692.
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Abstract:
Authentication is a very key part for network security. So the solution for network security authentication based on EPASS1000 was put forward. EPASS1000 is a portable device that is connected to computer via USB port and has a built-in MD5 encrypted algorithm, which introduces free-factor in plain ...

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