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2005 Vol. 31, No. 02

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Attitude control based on inverse dynamics and online parameter identification
Liu Jiarun, Shen Gongzhang
2005, 31(02): 111-115.
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Traditional integrated flight/fire control system uses a proportion-integral-differential(PID) structured flight/fire coupler, which results in lack of robustness and huge design workload. A synthesis method based on inverse dynamics and online parameter identification was developed and was directly...
Experimental investigation on temperature oscillation of loop heat pipes
Zhang Hongxing, Lin Guiping, Ding Ting, Shao Xingguo
2005, 31(02): 116-120.
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The phenomenon of temperature oscillation in loop heat pipes was described and explained. Test results indicate that temperature oscillation frequently occurred at very low and very high heat loads. At low start-up heat loads evaporation inside the primary wick was easy to occur when the evaporator,...
Stability on the damping capacity and microstructure of the high strength damping aluminum alloy
Ma Yue, Zhao Haitao, Han Haijun, Xu Huibin, Li Peiyong, Li Wei
2005, 31(02): 121-124.
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The stability on the damping capacity and microstructure of the X7093/5(Zn-30Al) high strength aluminum alloy prepared by rapid solidification and powder metallurgy process was investigated with aging treatment. The alloy was aged at 50℃,100℃,120℃ for 10 h,50 h,100 h separately and then air cooled. ...
Fault-tolerance dual computer system based on maintainability without powering off
He Yuzhu, Dong Junwei, Luo Yong, Li Xiao
2005, 31(02): 125-127.
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To improve the reliability of controller of a microcomputer, a fault-tolerant system which is consisted of two ones was proposed. In this system, output of a microcomputer was transmitted into another microcomputer through the serial ports, it was compared with the pre-stored data to carry out the d...
Implementation and evaluation of measurement tool for Java
Li Nuo, Jin Maozhong, Liu Chao
2005, 31(02): 128-133.
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Introduce object-oriented metrics; define the detailed definitions of McCabe, Halstead and weighted methods per class(WMC) for Java; a new method for implementation of measurement tool for Java was offered; demonstration for using this tool to optimize program and enhance software quality was also g...
Stretch bending of aluminum extrusion
Diao Keshan, Zhou Xianbin, Li Xiaoxing, Jin Chaohai
2005, 31(02): 134-137.
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An experimental study on stretch bending of aluminum extrusion was conducted under different pre- and post-stretching elongation. Cross section distortion caused by radial stress during bending process is one of main parameters concerning forming precision. As shown in the test, cross section distor...
Calculation of lid-driven cavity flow using GAO-YONG turbulence equations
Ren Xin, Gao Ge
2005, 31(02): 138-141.
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A two-dimensional stationary incompressible lid-driven cavity flow was numerically simulated employing staggered grid arrangement, incompressible SIMPLER method and QUICK scheme to solve GAO-YONG turbulence equations. The vorticity contour in the cavity and the velocity changing curve of cavity's ce...
Implementation of Chirp Scaling algorithm based on space-borne real-time SAR processor
Zhou Yinqing, He Min, Chen Jie, Li Chunsheng
2005, 31(02): 142-147.
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Based on the refined Chirp Scaling image formation algorithm, an efficient method for real-time processor on space-borne synthetic aperture radar (SAR) was presented. Its key technique is applicable to other precise imaging algorithms for high resolution space-borne SAR. The configuration of the rea...
Two significant technique requirements in supersonic airliner design
Jiang Chongwen, Huang Jun, Cao Yihua
2005, 31(02): 148-152.
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Supersonic airliner (SSA) is a significant development orientation for the future commercial transport. Two significant technique requirements, based on the study of the payload, range and velocity of new supersonic airliner, was deduced for SSA design. At first, a fuselage arrangement technique app...
Transducer of the ultrasonic elliptical vibration cutting based on the finite element method
Li Xun, Ji Yuan, Zhang Deyuan
2005, 31(02): 153-156.
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An asymmetrical structural model of the ultrasonic elliptical vibration transducer only with the longitudinal animation was presented through analyzing the model of the longitudinal vibration transducer. Based on the modal and static analysis of the finite element method, the various parameters of t...
Training sequence based carrier frequency synchronization method for OFDM system
Yang Chenyang, Hong Huiyong
2005, 31(02): 157-161.
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Based on the study of single estimation of phase-offset induced by frequency offset, two independent phase-offset estimations which could expand the capture range of frequency offset was thoroughly analyzed, and a trainingsequence based carrier frequency synchronization method for orthogonal frequen...
Path tracking control and simulation of underwater vehicle
Xu Liang, Bian Yushu, Zong Guanghua
2005, 31(02): 162-166.
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Path tracking of underwater vehicle was discussed. The kinetic equations of 6-degree of freedom underwater vehicles were given first, taking into account the gravity, buoyancy, thrust power and ocean current etc. Then a nonlinear controller, which includes an inner loop and an outer loop, was design...
Structure evolution of the steady and symmetric vortex pattern around a slender
Li Guohui, Deng Xueying, Ma Yu
2005, 31(02): 167-171.
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The structure evolution of flow pattern around a slender was calculated by numerical method. It was pointed that the development of slender vortices leads to the change of topological structure about cross flow, and a critical flow pattern will appear. A high-order singular point in this flowfield w...
Adaptive feedback control method for active vibration isolation based on on-line frequencies estimation
Zhang Lei, Liu Yongguang, Fu Yongling, He Lin
2005, 31(02): 172-176.
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As the adaptive feedforward control method used for active control of periodic vibration has many shortcomings, an adaptive feedback control method was proposed based on on-line frequency estimation. The vibration disturbance was recovered with the error signal, and the frequencies of periodic compo...
Aerodynamic configuration of hypersonic vehicle based on waverider body design
Zhang Dongjun, Wang Yankui, Deng Xueying
2005, 31(02): 177-181.
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The waverider with high lift-drag ratio was designed by the inverse-design method based on inviscid conical shock wave. When the basic conical shock wave is 12°, an effective improvement of the lift-drag ratio was obtained for the effect of the decrease of the pressure on the upper surface of the wa...
Construction of coherent 3D geological blocks from stratified geological structure
Meng Xianhai, Yang Qin, Li Jigang
2005, 31(02): 182-186.
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Building geometry model of complicated geological entity is important work in exploration and exploitation oil and gas field. With the introduction of geological geometry modeling method, the trend of syncretizing the surface modeling and solid modeling was pointed out, and an integral modeling me...
Numerical analysis for underground concrete oil tank
Huang Dahai, You Xusheng
2005, 31(02): 187-191.
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A new vessel,the prestressed concrete (PRC) oil tank,for the strategic petroleum reserve(SPR) was represented. With the application of structure analysis software ANSYS, the distribution of the temperature and stress in the side wall of the oil tank was given,in which the stress is caused by the tem...
Automatic focusing system of micro-vision based on image analysis
Sun Minglei, Zong Guanghua, Yu Zhiwei, Bi Shusheng, Yu Jingjun
2005, 31(02): 192-196.
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An automatic focusing system of micro-vision for micro alignment assembly was developed. The system was based on spatial domain analysis. First-order differential operator in y direction was choosed as focusing evaluation function to realize autofocus quickly and accurately. Processing the image in ...
Remote sensing image compression based on visual model and image feature
Jiao Runhai, Li Yuancheng, Hou Jingbiao
2005, 31(02): 197-201.
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With characteristics of complicated texture and rich edges, remote sensing image is usually hard to achieve high compression ratio. Energy distribution among wavelet subbands at different orientations and scales was statisticed, then an adaptive quantization method for different wavelet subbands coe...
Heat transfer in complex passages of turbine blade trailing edge
Li Li, Ding Shuiting, Tao Zhi, Xu Guoqiang, Zhao Shihong
2005, 31(02): 202-205.
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An experimental comparison research of endwall heat transfer characteristics was conducted in the complex passages of turbine blade trailing edge by using thermochromic liquid crystal method. Three kinds of diaphragm plates between two passages were studied to obtain optimal heat transfer effect. Re...
Numerical simulation of the 3-D unsteady flow in the last stage of the steam turbine
Qi Lei, Zheng Ning, Cheng Honggui
2005, 31(02): 206-211.
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Air cooling steam turbine uses air as working fluid, and it works in variable-operating condition. It is important for the design of air cooling steam turbine and the performance and stability of turbine to study unsteady flow mechanism in design and off-design state. The flow of turbine in design a...
Optical pulse active replicator based on fiber-optic delay-time
Feng Da, Li Zheng, Zheng Zheng, Chen Yuxiao, Tang Dan
2005, 31(02): 212-217.
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Based on the fiber circulating delay line, an optical pulse active replicator using semiconductor optical amplifier (SOA) was proposed for high-fidelity replication of short analog optical pulses according to the requirements of a short optical pulses measurement system. Taking into account amplifie...
Modeling of airliner gasoline tank and modification of attitude error of sensor
Jin Yulin, Zhuang Daming, Yang Qin
2005, 31(02): 218-222.
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The algorithm of modeling civil airliner gasoline tanks and modifying the attitude error of tank volume sensors was provided. Tank surface was generated with triangle mesh based on two-dimensional Delaunay triangulation and interpolation. Using the wrong result of gasoline volume sensors, current at...
New definition method of state of charge for batteries in HEV
Wu Hongjie, Qi Bojin, Zheng Minxin, Chen Bo, Shu Weihui
2005, 31(02): 223-226.
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A new definition method to describe the state of the batteries in a hybrid-electric-vehicle (HEV) was proposed. The batteries in the question are MH/Ni batteries which have a normal capacity of about 8 A·h, and were used in a kind of HEV. The HEV application is a very harsh environment with high cha...
Integrative framework for heterogeneous synchronous collaboration systems
Li Lüsong, Li Jing, Yu Min, Yu Jianjun
2005, 31(02): 227-231.
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To solve the communication problem of synchronous collaboration systems with heterogeneous architectures, the integration of the heterogeneous systems was discussed. A new formalized mode of synchronous collaboration system was proposed and key integration operation was defined, based on the set the...
Application of virtual instrument based on CAN bus in multi-motor control system
Huang Jian, Han Mei
2005, 31(02): 232-235.
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The concept of virtual instruments was applied in a multi-motor control system to monitor each motor’s movement track and character of current, in order to realize optimal control. The multi-motor control system adopted client/server structure based on controller area network (CAN) bus, and the virt...
Optical, electrical and infrared emissing properties of DC magnetron sputtered ZnO:Al thin films
Wang Wenwen, Diao Xungang, Wang Zheng, Wang Tia
2005, 31(02): 236-241.
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Aluminium-doped zinc oxide (ZnO:Al) films were deposited on glass substrate by DC reactive magnetron sputtering from a Zn-Al metallic target (ω(Al)=3%). Films with novel, tangly string-like surface morphology, an average optical transmittance up to 90% in the visible range, a widest band gap of 3.47...
On-site induction brazing of tubes
Zhang Wei, Qi Bojin, Jin Yulan, Zhang Jin
2005, 31(02): 242-246.
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In a plane factory, some tubes connection is in the plane by welding. Traditional induction brazing device with a fixed coil could not adapt this new process. Considering the characteristic of on-site induction brazing of tubes, a set of equipment and related technologies were developed, including a...
Stacking sequence optimization of composite laminate applying genetic algorithm of immunity
Lu Dawei, Li Shu
2005, 31(02): 247-250.
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The sequence of composite laminate was optimized by genetic algorithm (GA) of immunity. The immunity mechanism was used to improve the convergence efficiency and solve the precocity problem of GA. The mathematic model was built to optimize the inplane geometry and bend factors. The optimization resu...
Ab initio calculations of anatase TiO2
Cao Honghong, Huang Haibo, Chen Qiang
2005, 31(02): 251-254.
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When photoelectrochemical cell possessing an anode of TiO2 was reported, photocatalysis has developed into a major area of intensive investigation. The results of the self-consistent calculations on the anatase phase of TiO2 was presented. The calculations were performed using the full potential-lin...
Finite element analysis of O-ring seal structure
Hu Dianyin, Wang Rongqiao, Ren Quanbin, Hong Jie
2005, 31(02): 255-260.
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Applying the theory of nonlinear finite element analysis, the stresses and strain of the elastomeric O-ring seals at storage and working process were analyzed. The factors influencing sealing performance were considered, such as gap between upper and nether flange, initial compressibility, groove wi...
Fluid flow and heat transfer characteristics in the leading of blades at rotating state
Zhu Jinrong, Wu Hong, Tao Zhi, Ding Shuiting, Xu Guo
2005, 31(02): 261-264.
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Numerical simulation was performed to study the cooling configuration in the leading of blades at rotating state. The configuration was consisted of entering gas cavity, trailing edge and leading edge blocks. Computation was carried out for the different rotating velocity. The influence of rotating ...

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