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2006 Vol. 32, No. 03

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Design and simulation of BTT nonlinear controller for hypersonic vehicle
Li Yang, Chen Wanchun
2006, 32(03): 249-253.
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Aerodynamics effects of hypersonic vehicle are complex than that of common vehicle. Bank-to-turn(BTT) technique can satisfy the demands of hypersonic vehicle for aerodynamics shape, with which brings dynamics system the character of fast time-varying, strong coupling and high nonlinear. Against the ...
Human modeling and simulation based on Lagrangian method in weightlessness
Wang Juan, Zhuang Damin
2006, 32(03): 254-257.
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The necessity of computational multi-body dynamics simulating the astronaut extra vehicular activity (EVA) was described. The 4 joints universal human body inverse kinematics model and inverse dynamics model in weightlessness utilizing computational multi-body dynamics were proposed. A typical EVA, ...
Trajectory planning for low attitude penetration based on improved ant colony algorithm
Li Dong, Cao Yihua, Su Yuan, Feng Ting
2006, 32(03): 258-262.
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Abstract:
To ensure the mission success rate for low attitude penetration, a trajectory with high survivability and acceptable path length must be planned. As a kind of new emulated evolutional algorithm, ant colony algorithm (ACA) is fit for searching the best way in trajectory planning. The algorithm has se...
"Over-under" concept hypersonic turbo-ramjet combined propulsion system
Zhu Daming, Chen Min, Tang Hailong, Zhang Ji
2006, 32(03): 263-266.
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Turbo-ramjet combined propulsion system for a hypersonic transport was examined, which can work steadily and reliably in a wide flying-scope(Ma＝0~5,H=0~30 km). The overall performance simulation of turbo engine and ramjet engine was accomplished. The simulation of turbo/ramjet mode transition and th...
Algorithm of trimmed surface triangulation of prepositive disposal in predicting RCS of aircraft
Hu Bifu, Song Yuwang, Zhao Hui, Xi Ping
2006, 32(03): 267-270.
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While computing radar cross section(RCS),surfaces of objects were primarily triangulated, which was called prepositive disposal. The length of the edge of the triangle was generally 0.1 wavelength(in general one wavelength is 3 cm).The shape of aircrafts was complex , aircrafts’ geometric model cont...
Influence of circular angle in symmetric plane to the flowfield characteristics of an axisymmetric parachute
Jiang Chongwen, Cao Yihua, Su Wenhan
2006, 32(03): 271-275.
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According to the characteristics of parachute, the 3-D complex flow problem was transformed into an axisymmetric problem with computational timesaving, based on three assumptions (membrane assumption of canopy, axisymmetric assumption of parachute, and steady assumption of flowfield). After the circ...
Different structure diaphragm plates in complex passages of turbine blade trailing edge
Ding Shuiting, Liu Liyan, Li Li
2006, 32(03): 276-279.
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The experiment mainly conducted the effect of three different structure diaphragm plates in the complex passages on heat transfer and pressure drop characteristics of turbine blade trailing edge. A thermochromic liquid crystal method was used to measure the detailed heat transfer coefficients on the...
Model for ground starting of turbofan engine
Zhu Zhili, Gao Chao
2006, 32(03): 280-283.
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The simulation model of turbofan engine for ground starting was described. The simulation is based on thermo-aerodynamics relationship, the components’ characteristics, experienced formulas. According to being given known condition and fuel regulation, the starting has been simulated by integral met...
Local heat transfer in a rotating U-shaped square channel with three channel orientations
Liu Chuankai, Tao Zhi, Ding Shuiting, Xu Guoqiang
2006, 32(03): 284-287.
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The influence of channel orientation on the local heat transfer coefficient in a rotating, U-shaped, square channel with smooth walls was investigated for rotation number from 0 to 0.26. The three channel orientations were square channel parallel to the rotation axis, square channel twisted at 22.5°...
Wake integration method for airfoil drag evaluation using N-S equations
Liu Zhou, Zhu Ziqiang, Wang Xiaolu, Wu Zongcheng
2006, 32(03): 288-292.
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Abstract:
Minimal improved far field method for airfoil drag evaluation——wake integration method was introduced. The position of wake integration and associated integral technics were also discussed. Predicted drag values for a given airfoil(RAE2822 airfoil)were compared and discussed using the surface integr...
Combined simulated annealing and soft-threshold wavelet de-noising of SAR image
Zhou Yinqing, Zhang Lei, Xu Huaping
2006, 32(03): 293-296.
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Abstract:
A technique of speckle reduction in synthetic aperture radar (SAR) images was presented. Based on the character of wavelet transforms that the approximate coefficients of the transformed image still obey Gibbs distribution, the simulated annealing to the wavelet domain was introduced. The traditiona...
Multiple moving objects segmentation algorithm in complex traffic scene
Li Juntao, Zhang Hai, Fan Yuezu
2006, 32(03): 297-300.
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Abstract:
To solve multiple moving objects segmentation problem in complex traffic scene outdoors, a new segmentation algorithm of multiple moving objects segmentation in complex traffic scene of outdoors was developed. The presented method consists of two phases. In the motion detection phase, motion-changed...
Internal coupling vibration of Coriolis mass flowmeter
Zheng Dezhi, Fan Shangchun
2006, 32(03): 301-305.
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Abstract:
Resonant Coriolis mass flowmeter (CMF) measures liquid mass flux via the Coriolis theory of the measurement tubes resonant vibration. Actually the external coupling and the internal coupling vibration are widely existent, the operating stability and the measurement precision are directly influenced....
Auto-focusing algorithm based on cross correlation
Dong Dai, Liu Rong, Sun Minglei, Zong Guanghua
2006, 32(03): 306-310.
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Aiming auto-focusing system, auto-focus algorithm based on cross correlation was brought forward. The limitation of conventional auto-focusing in definition and velocity was analyzed. Correlation principle was introduced, and template correlation algorithm based on cross correlation was defined. Owi...
Novel scheduling algorithm based on packet aggregation effect for optical switches
Xiong Qingxu, Feng Jinxin, Wang Fengzhou
2006, 32(03): 311-315.
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Abstract:
The packet scheduling in optical switches has to be frame based because the configuration consumes much time. The frame size is usually selected to be large enough in order to improve transmission efficiency, leading packet aggregation effect. With consideration of the packet aggregation effect, a n...
Signal detecting technique for Sagnac fiber-optic temperature sensor
Yang Yuanhong, Shen Ming
2006, 32(03): 316-319.
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A temperature sensor based on polarization non-reciprocity (PNR) in fiber-optic Sagnac interferometer (FSI) can measure the temperature of one point in high precision. The phasic subtraction of two light beams was shifted while temperature field around the probe changed. Analyzing the temperature me...
Some notes on complete synchronization of the coupled neurons
Wang Haixia, Lu Qishao
2006, 32(03): 320-323.
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Complete synchronization of two mutually coupled identical chaotic Hindmarsh-Rose neurons model with gap junction was studied. Gap junction isalso called electrical coupling, it acts as one of the main communications between neurons in nervous systems, its most important role is to make a large ense...
Temperature dynamic characteristics analysis and control of optic-fiber light source
Ma Yingjian, Jian Hongqing, Shi Duo
2006, 32(03): 324-327.
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Abstract:
According to the basic theory of the thermo-electric cooler(TEC),the temperature dynamic characteristics of the optic-fiber light source module was analyzed, and mathematics model was established corresponds to its. In the actual experimental test to light source module, the TEC module was driven by...
Low-rank adaptive method for sub-optimal channel estimation in OFDM system
Ju Min, Xu Zongze
2006, 32(03): 328-332.
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A sub-optimal channel estimation algorithm in orthogonal frequency division multiplexing (OFDM) system was proposed, to reduce the complexity of traditional minimum mean square error (MMSE) channel estimator, and to alleviate the performance deterioration of MMSE estimator due to the mismatch of the...
Design of delay mapping receiver for GPS remote sensing
Zhang Yiqiang, Zhang Qishan, Yang Dongkai, Li Ziwei
2006, 32(03): 333-336.
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Signals of global positioning system (GPS) can be used for purposes such as navigation and positioning. The utility of scattered GPS signals from rough surfaces brings a new technology for microware remote sensing. Background and advantage of GPS based sea surface wind remote sensing technique and s...
Remote-rendering based 3D model publishing system
Jin Ping, Zhang Haidong, Qi Yue, Shen Xukun
2006, 32(03): 337-341.
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3D models have been widely used on internet. However, the conventional publishing way which downloads models first and then renders has always been haunted by the limitation of security threat, network bandwidth and low graphic performance of client machines. By combining 3D model simplification and...
Intercluster simulation of UPMA protocol for self-organizing networks
Ding Lijun, Liu Kai, Li Hantao, Zhang Jun
2006, 32(03): 342-346.
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Based on the concept of contention reservation, polling transmission and combining distributed clustering network architecture, an user-dependent perfect-scheduling multiple access (UPMA) protocol for supporting node mobility and multihop architecture in wireless self-organizing networks was describ...
Secure trust negotiation system for grid computing
Zhang Rongqing, Li Jianxin, Huai Jinpeng
2006, 32(03): 347-351.
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Abstract:
Grid technology promotes resource sharing and collaboration over wide area network. However, service providers and requestors are always located in different secure domains in grid environment. How to establish trust between strangers without prior relationship has become a pressing problem. A syste...
Dynamic inlining scheme improvement in JVM
Zhou Jing, Wang Lei, Liu Zhicheng
2006, 32(03): 352-356.
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In the Java virtual machine(JVM), traditional counter-based hotspot-detecting method usually can not get the caller-callee relationship, therefore, the dynamic compiler which applied this scheme would lose some optimization opportunities, such as method inlining. A dynamic inlining scheme based on o...
Deformation capability and load-carrying capability of steel plate element under high temperature
Zhu Jianming, Wei Dong, Liu Yinghua
2006, 32(03): 357-360.
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In the plastic design and anti-seismic design of steel structures, It is demanded that the component plates undergo large local deformations for the plastic hinge to develop and the load-carrying capability doesn’t decreasebecause of local buckling of the plates. Based on the basic principles and me...
Preparing technics and decoloring mechanism analysis of high-grade dispropriated rosin decoloration
Zhu Yuelin, Tang Lini, Guo Hong
2006, 32(03): 361-364.
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Aimed at the over tint problem of disproportionated rosin in present demostic market, SQH-9 was used as a new decloring reagent,in order to deoxidize and refine disproportionated rosin, which was produced by Guangxi Wuzhou Rosin Ltd. The best decloring technic conditions were decided, including temp...
Effects of Si on high temperature oxidation resistance of TiAl alloy
Xiao Weihao, Zhang Liang, Jiang Huiren
2006, 32(03): 365-368.
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The isothermal oxidation of TiAl-Si(atom percent is 0~20%) alloys at 1 173 K, 24 hours on atmosphere were studied by X-ray diffraction,scanning electron microscopy and energy dispersive spectrum. The results reveals that the addition of Si improves the oxidation resistance of TiAl alloys. With incre...
Bubble transfiguration and moving condition in different channels
Zhao Weijuan, Zhang Zuoguang, Sun Zhijie, Wang Jingmi
2006, 32(03): 369-372.
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Void is one of the most important factors which affects performances of composites. The void problem is generic to most polymer composite process, regardless of whether the matrix is a thermosetting or a thermoplastics matrix. In order to eliminate porosity and promote product quality, it is essenti...

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