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2003 Vol. 29, No. 7

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Calculation of range and endurance of jet aircraft at constant altitude
Zhang Yunfei, Guo Wei, Ma Dongli, Xiang Jinwu
2003, 29(7): 565-569.
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Abstract:
When the thrust coefficients of fuel consumption were constant, the calculation formulas of optimal cruise states (including posture and airspeed) were presented for long-range and long-endurance, and the calculation formula of range and endurance were given when flight strategy held airspeed or pos...
Fuzzy basis function network based approach for fault information detection in unknown systems
Song Hua, Zhang Hongyue
2003, 29(7): 570-574.
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Abstract:
Fuzzy basis function network (FBFN) based on T-S fuzzy model is given. A general approach for fault information detection in unknown systems using FBFN is present. The unknown system is composed of known part and unknown part. The output of an actual system is composed of three portions: the output ...
Research on relation between crack extension resistance curve and sample thickness
Yang Jiyun, Zhang Xing, Zhang Min
2003, 29(7): 575-578.
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Abstract:
A mathematical formula for the relation between resistance curve of crack extension and sample thickness was obtained in fracture mechanics, based on the theoretical resistance curve of crack extension which was provided in the previous work. Some parameters in the formula were determined by the lea...
Singularity avoidance in redundant single gimbal control moment gyroscope systems
Wu Zhong, Chou Wusheng
2003, 29(7): 579-582.
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Abstract:
Single gimbal control moment gyroscope (SGCMG) is one kind of inertial actuators applied to the spacecrafts. Three or more SGCMGs are used in order to meet the need of the 3-axis attitude control. Singularity often arises when several SGCMGs work coordinately. A new detecting method of avoidability ...
Analysis of optimal adjustment of turbofan engine based on trial center data
Zhu Zhili, Meng Fantao, Chen Baoyan
2003, 29(7): 583-587.
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Abstract:
A new optimal adjustment method of engine was discussed. Based on multi variables and multi objectives, this method can search out an optimal adjustment case to meet the design demand in use of the engine characteristic simulation model and the result of fault diagnosis. An engine adjustment model w...
Research on infrared stealth system for armed helicopter
Wu Zhenbo, Wu Zhe
2003, 29(7): 588-592.
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Abstract:
Based on the battlefield environment for performing operational mission, emphasis should be placed on the threat from infrared guided missile when conducting infrared stealth for armed helicopter. Modes and developing tendency of infrared guidance were introduced, calculation formulas of performance...
Study on method for processing image of strip in structured-light 3D vision measuring technique
He Junji, Zhang Guangjun
2003, 29(7): 593-597.
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In a structured-light vision system, the accuracy of center position of the stripe is of great importance for that of the whole measuring system. Processing the image of stripe is an important step, especially for images with serious noises. Methods for processing images of stripe disturbed by vario...
Study of optimization method for flight path following
He Pei, Qu Xiangju
2003, 29(7): 598-601.
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Minimizing the tracking deviation between the real path and the referenced path can produce optimal following path, but it will bring a considerable oscillation of optimal control variables. In order to alleviate the considerable oscillation, a new integrated control method that combines the deviati...
Research on dynamic virtual prototyping of aircraft
Liu Jie, Peng Xiaoyuan, Liu Li
2003, 29(7): 602-606.
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Abstract:
Virtual prototyping(VP) is a new technique in design and manufacture. Dynamic virtual prototype has some key techniques, such as the highest model, real time running architecture and normative data structure, etc. A basic study of dynamics VP was accomplished, and a simple and clear environment of t...
Research on high-efficiency arithmetic to improve ray trace method
Huang Peilin, Wu Zhe
2003, 29(7): 607-610.
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Abstract:
A new technique named local aperture grid optimization arithmetic was presented to improve the efficiency of the classical method. The chief aperture that contains all the rays in the incident field was divided into local aperture grids, on which selected sampling rays was calculated to determine it...
constant toolpath generation in NC machining
Yan Guangrong, Zhu Xinxiong, Bai Juntao, Lei Yi
2003, 29(7): 611-615.
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Abstract:
Appealed by high-speed Z -constant machining with high quality, an algorithm of generating Z -constant toolpath in NC machining was presented based on the cutter location surface and its Zmap model. It suggests guarantees that the toolpath of climb cutting can be obtained in consideration of the cut...
Thermal design technology of space suit used for extravehicular activity
Qiu Yifen, Yuan Xiugan, Mei Zhiguang, Sang Minjing
2003, 29(7): 616-619.
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Abstract:
Contents about the title were presented, and the current situation was reviewed in this field. Three mathematical simulation models were analyzed, they were mathematical simulation of two-dimensional human thermalregulation system in wide temperature range, the finger temperature field simulation an...
Research on improving the disturbance resistance ability of radioactive isotope aircraft fuel density measurement
Li Nan, Lü Junfang
2003, 29(7): 620-623.
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Abstract:
The aircraft fuel density measuring system by utilizing the radioactive isotope was introduced. A method of correcting the measuring data and a scheme of twin-detectors measuring system were led by efforts to solve the initial intensity fluctuation of the radioactive source in the measuring procedur...
Design and implementation of communication server on highway toll connection system
Fu Mengruo, Wu Jinpei, Zhang Qishan
2003, 29(7): 624-626.
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Abstract:
Communication server on highway toll connection system is the center of data transmission. The design, realization and characteristics of communication server were introduced. Based on designed protocol support packets priority, communication server exchanges data concurrently with end-users. Client...
B-P viscoplastic constitutive modeling of Udimet 720 Li
Shi Duoqi, Yang Xiaoguang, Wang Yanrong, Zhou Yanpei
2003, 29(7): 627-630.
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Udimet 720 Li is a Ni-based superalloy used for aeroengine disc. Based on the uniaxial tensile, cyclic loading and creep experiments results at 650℃, the Bodner-Partom unified viscoplastic constitutive theory was applied to model the mechanical behaviors of the material under three different loading...
Study of grid security architecture
Liu Yiwen, Li Weiqin, Wei Wei
2003, 29(7): 631-635.
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Abstract:
The unigue security requirements of grids were described as well as the shortcoming of the existing technologies, a grid layered security architecture was developed which provides an integrated solution to fit all these grid security requirements, and some key techniques to achieve the grid security...
Heat transfer in rotating cavity with axial throughflow of cooling air
Ning Lei, Ding Shuiting, Tao Zhi, Xu Guoqiang
2003, 29(7): 636-639.
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Abstract:
A test model of four co-rotating disks was developed as the simplified version of a typical internal cooling system of a gas turbine compressor. The investigation was on the distribution of local heat transfer coefficient and the averaged nusselt number of the downstream main disk. Experimental anal...
Study on an improved recursive partial least-squares modeling approach and application
Liu Qiang, Yin Li
2003, 29(7): 640-643.
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Abstract:
Based on the related partial least-squares (PLS) algorithms, a new improved recursive partial least-squares (SR-PLS) algorithm was derived. The SR-PLS simplifies the recursive computations by substituting the two principal matrices of the independent variables for the residual matrices directly. By ...
Error analysis of high-aspect-ratio finite elements for 2-D boundary layer simulations
Wang Hao, Wu Songping
2003, 29(7): 644-648.
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Abstract:
A new error analysis in finite element method, which is based on the element size in spatial directions respectively, was proposed. This analysis is different from the ordinary error analysis method, which is based on the overall size of elements. An error matching principle can be derived from the ...
Techniques and developments of MPEG audio
Li Chao, Xiong Zhang, Ouyang Yuanxin
2003, 29(7): 649-653.
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Abstract:
Moving pictures experts group(MPEG) series standards have become one of the most popular families in the field of multimedia application. MPEG audio is an elementary part of these standards. With the normalization of new standards such as MPEG-4/7/21 in the recent several years, a novel multimedia a...
Analysis of double-sided arc welding technology and physical process
Cui Xuming, Li Liuhe, Zhang Yanhua
2003, 29(7): 654-658.
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Abstract:
Double-sided arc welding (DSAW) is a new technology which has been utilized in recent years. It has many advantages such as increasing weld penetration, decreasing weld defects, reducing welding deformation, improving welding speed and saving power consumption. The basic types and technological mech...

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