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2003 Vol. 29, No. 2

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Reduction of Cabin Noise Induced by Flow Around Air Refueling Pipe
Luo Guailin, Wang Yu, Wang Jinjun
2003, 29(2): 95-98.
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Fixed refueling pipe added to a fighter induces an obvious increase of the cabin noise. In order to reduce the noise, the changing laws of the cabin noise was tested in flight, then the reason of noise increase was investigated by flow field visualization tests and turbulent flow measurements in win...
Examination of a Computer Vision System Used for the Automatic Landing of Unmanned Helicopter on Ship
Qiu Liwei, Song Zishan, Shen Weiqun
2003, 29(2): 99-102.
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A computer vision solution scheme for the automatic landing of unmanned helicopter on ship was examined from the view of engineering application. A series of computer vision algorithms such as LOG filter, Hough transform and Kalman filter, were adopted and integrated to get the relative positions be...
Optimum Interleaver Design for serial Concatenated Convolutional Codes
Li Yi, Fan Yuezu, Li Daoben, Li Yonghui
2003, 29(2): 103-107.
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Serial Concatenated Convolutional Codes (SCCC) is a better scheme presented recently for channel coding. This scheme employs two recursive systematical convolutional codes and an inner interleaver, where interleaver design plays an important role. According to coding structure and puncturing pattern...
Operational Profile Development Based on UML Use Case Diagram and Sequence Diagram Model
Wang Hao, Wu Ji, Liu Chao, Gao Zhongyi
2003, 29(2): 108-111.
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A new approach for developing operational profile used in software reliability engineering was presented, based on UML (Unified Modeling Language) use case diagram and sequence diagram model. With the approach, the operational profile developing process was reduced to three main steps. To compare wi...
Design and Implementation of the Telemetry System for Pilotless Helicopter
Lu Guolei, Zhang Xiaolin, Jin Shi, Kuang Wei
2003, 29(2): 112-115.
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It is very important to maintain a reliable telemetry data communication link between the pilotless helicopter and the telemetry ground station due to the special deployment condition and the high maneuverability of the helicopter.The base station system must be small and light while its reliable fu...
Application of Inductorsyn in Sampled Servo System
Liu Qiang, Er Lianjie, Wu Yunjie, Wang Weihong
2003, 29(2): 116-119.
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For the sampled servo system using inductorsyn as position sensor, the presence of measuring delay leads to large measuring error. In order to solve the problem mentioned above, a new dynamic compensation method using linear extrapolation scheme was presented to compensate the measured output of ind...
Wind Tunnel Test for Roll/Lateral Aeroservoelasticity of Aircraft
Zhang Junjie
2003, 29(2): 120-123.
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The low speed wind tunnel test of a aeroservoelastic (ASE) aircraft model about roll/lateral direction was introduced, in order to validate the analysis method about aircraft ASE stability and stability margin. The test model, subsystem of test, the ways to carry out test, the test content and the t...
Galvanic Corrosion Behavior between Titanium Alloy and HighStrength Alloys
Liu Jianhua, Wu Hao, Li Songmei, Xie Zhibing
2003, 29(2): 124-127.
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Galvanic corrosion between titanium alloy TC2 and two aluminum alloys (LY12,LC4) and two high-strength steels (30CrMnSiA,1Cr17Ni2) were investigated by galvanic corrosion testing,SEM and DES. The difference of galvanic corrosion behavior of two aluminum alloys and of galvanic corrosion behavior of t...
Infrared Image Car License Plate Location Method Based on Apriori Knowledge
Hu Aiming, Zhou Xiaokuan
2003, 29(2): 128-131.
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Since the background of a car license plate in an infrared image is quite complex, so it is difficult to locate it. A fast infrared image car license plate automatic location system is presented. The system is suitable for locating the position of car license plate in an infrared image under all-wea...
Speckle Filtering Based on Segmentation for Monolook SAR Images
Yan Ying, Zhou Yinqing
2003, 29(2): 132-135.
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A segmentation based method was proposed for speckle-reduction of synthetic aperture radar(SAR) monolook images. Taking explicitly into account the characteristics of areas in a SAR monolook image, this method maximizes a given area with the help of edge detection with constant false alarm rate, and...
Numerical Evaluation of MagneticDipole Field in Inclined Multilayer Dipping Media
Shi Xiaofeng, Li Zheng, Wang Baofa, Xiao Hongbing
2003, 29(2): 136-139.
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The electromagnetic response of magnetic-dipole in inclined multilayer dipping media was studied. Electromagnetic field formulas and a successive derived numerical method were given. On the above basis, a approach to profile and to predetermine the formation interface using resistivity readings at l...
Distortion Error Model of Image of Ellipse Center in 3D Visual Inspection
Wei Zhenzhong, Zhang Guangjun
2003, 29(2): 140-143.
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In 3D visual inspection applications, there usually exists a distortion error of the CCD camera's pin-hole image of ellipse center. To address this problem, a mathematical model of this distortion error on the image plane of the CCD camera was established based on the theory of perspective projectio...
Preparation of in Vivo Degradable Material Used in Bone Fixation
Shi Xiaolin, Xie Huaiqin, Zhang Zhenyu
2003, 29(2): 144-146.
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To develop a kind of material with moderale strength and flexibility for bone fixation. First a series of product polymeric on chain reaction was obtained between poly D,L lactide and poly several lactore. Then to detect change regulation which tensile strength and degrading properties of product po...
Radar Scattering Characteristic Test and Analysis of Two Stealth Aircraft Models
Zhang Yunfei, Ma Dongli, Wu Zhe, Zhang Kao
2003, 29(2): 147-150.
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Radar scattering characteristics of two stealth fighter models were tested and analyzed. The models were stealed with the following procedures: controlling the radiating directions and numbers of main scatter sources, increasing the occupation ratio, surface metalizing, leaning the intake lips in th...
Image Compression ASIC for Satellite Remote Sensing Application
Cheng Zijing, Zhou Xiaokuan, Jiang Hongxu
2003, 29(2): 151-155.
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A VLSI architecture for the algorithm of combining re-sampling with multi-mode adaptive quantization was proposed. With low hardware complexity and fast computation rate, the architecture can deal with huge amount of data and match the requirement of VLSI architectures in regularity, modularity, loc...
Experimental Investigation on Effect of Horizontal Tail Deflectionon Aerodynamic Characteristics of Aircraft under Vectoring Jet
Wang Yankui, Deng Xueying
2003, 29(2): 156-160.
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Thrust vectoring is one of the advanced technologies in the design of 4th generation fighters to provide high maneuverability and agility. The effect of horizontal tail deflection on aerodynamic characteristics of aircraft with or without vectoring jet was investigated experimentally in a FL-1wind t...
Nominal Stress Approach for Fatigue Life Estimationunder Corrosive Environment
Wang Zhongbo, Liu Wenting, Jiang Dongbin, He Xiaofan
2003, 29(2): 161-164.
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In order to estimate fatigue life of aircraft structures under corrosive environment, a nominal stress approach under corrosive condition (Cor-NSA) was developed. Based on the curve of parking corrosion influence factor (C) versus parking time (T),p-S-N curves for the critical part of an aircraft co...
Numerical Investigation of Pressure Oscillation inGas Dynamic Resonance Tube
An Lian, Liang Guozhu, Tong Xiaoyan
2003, 29(2): 165-168.
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For studying the heating phenomenon in the gas dynamic resonance tube, the two dimensional axisymmetrical Euler equations and the explicit MacCormak scheme were used to simulate the non-stationary flow field in a resonance tube. Calculations were done for the driving gas of different pressures. Pres...
Application of SDMA in GSM
Cui Yan, Lü Shanwei
2003, 29(2): 169-172.
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Considering the special characters of GSM (Globle System for Mobile) and the method presented by other researchers which uses antenna arrays to eliminate the cochannel interferences in wireless communication, a SDMA (Space Division Multiple Access) architecture used in GSM was put forward. Adaptive ...
Vibration Attenuation Mechanism Investigation of a Adaptive Squeeze Film Damper
Ma Yanhong, Hong Jie, Zhao Fuan
2003, 29(2): 173-177.
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An ASFD/MRR (Adaptive Squeeze Film Damper with Metal Rubber outer-Ring) was designed to improve the high non-linearity of oil film force of conventional SFD (Squeeze Film Damper). The ASFD/MRR can effectively reduce vibration due to its ability of automatically adjusting the film clearance by elasti...
Design of Radio Frequency Smart Card Module
Yan Guangwen, Zhang Qishan
2003, 29(2): 178-180.
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Based on the ISO14443 and the principles of modern communication, a new method to design RF module of contactless smart card reader presented by using latest RISC single chip microprocessor .Encode and decoder were realized mainly by software instead of hardware ASIC. It has high performance of reli...
Disturbance Observer Based Robust Tracking Control of HighPrecision Flight Simulator
Liu Qiang, Er Lianjie
2003, 29(2): 181-184.
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Design method of a robust digital tracking controller based on disturbance observer for high precision flight simulator was presented. The controller consists of feedforward controller, feedback controller and friction compensation term. Feedforward controller composes of a zero phase error tracking...
Study on Flowing State of Magnetic Fluid in Seal Gap of Reciprocating Shaft
Li Decai, Lan Huiqing, Bai Xiaoxu, Wang Zhishan
2003, 29(2): 185-188.
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In order to solve the problems that exit in the magnetic fluid sealing of reciprocating shaft, the magnetic fluid flow in the seal gap was studied when the reciprocating shaft moves with different velocities and strokes. The follwing were focused on the regular pattern of such flow, the loss quantit...

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