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2002 Vol. 28, No. 6

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Series-Mixed-Cell Computational Model of Molecular Sieve Oxygen Concentrator
YANG Feng, LIN Gui-ping, YUAN Xiu-gan
2002, 28(6): 609-612.
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A series-mixed-cell model was proposed to describe the adsorption beds in order to transform the control equations of molecular sieve beds from partial equations to normal equations. Considered pressure variation in the column and Henry coefficient variation due to adsorption heat, a nonisothermal a...
Kinematics Analysis and Simulation of Free-Floating Space Robot
REN Jing-yi, SUN Han-xu
2002, 28(6): 613-616.
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The movement of the end-effector of free-floating space robot is related to not only the movement of each joint, but also the trajectory and the mass distribution of each link. This is the most distinct difference between free-floating space robot and terrestrial robot. Thus, the kinematics of free-...
Study on Theory and Arithmetic of Stationary Alignment for PINS
LIU Zhun, CHEN Zhe
2002, 28(6): 617-620.
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The observability of stationary alignment for PINS was analyzed systemically, and condition number of observable matrix was adopted to compute quantificationally the observability of stationary alignment for PINS. Three unobservable states with the least condition mumber were chosen in this conditio...
Ground-Speed/Air-Speed Control of Airplane During Penetration of Windshear
CHEN Yong, JIN Chang-jiang
2002, 28(6): 621-624.
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To design the control logic during the penetration of windshear, Non-linear Inverse Dynamics (NID for short) method has been employed to achieve the decoupling of the non-linear flight control system and the implementation of the real-time/on-line control for the flight trajetory. Two independent co...
Interference-Free Cutter Location Data Computation for Flat-Endmill in 4-Axis NC Machining
WU Li-ping, SHI Fa-zhong, CHEN Wei-dong
2002, 28(6): 625-628.
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An analytical method based on discrete model was presented to detect and avoid interference for flat-endmill in 4-axis NC machining. Based on the analyses conducted, an algorithm of interference-free cutter location data computation for flat-endmill in 4-axis NC machining was developed. Calculation ...
Optimization Design of Connecting Power Cable in Induction Heating
ZHAO Jing, QI Bo-jin, CHEN Jing-wu, NI Qian
2002, 28(6): 629-632.
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In some induction heating process, induction coil is connected with power source through connecting power cable. In order to solve the problem of lower heating efficiency brought by connecting power cable, the power loss and the energy stored in inductance during induction heating were calculated. T...
Quick Construction of Radar Blind Space for Stealthy Penetration
WU Qiang, JIN Chang-jiang
2002, 28(6): 633-635.
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Before planning stealthy penetration flight route, the Threat States Space (TSS) and the Radar Blind Space (RBS) should be constructed firstly, which represent the defense strength of the enemy. On analysing the factors of generating RBS, a quick algorithm of constructing RBS for planning stealthy p...
Dynamic Stability Analysis and Control Law Design of Stability Augmentation System for Helicopter
SU Yuan, CAO Yi-hua
2002, 28(6): 636-639.
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Dynamic stability and control laws of a hingeless rotor helicopter were studied. Based on dynamic stability analysis of the helicopter, the unstable mode and the necessity of installation of Stability Augmentation System (SAS) were cognized. The control laws of SAS for helicopter pitching, rolling a...
Method of Testing and Calculating for Frequency Characteristics of Digital Closed-Loop FOG
MA Ying-jian, WANG Zheng, ZHANG Wei-xu, WANG Yan
2002, 28(6): 640-642.
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A mathematical model for digital closed-loop FOG(fiber-optics gyroscropes) was established to get the difference equation of the model. Also, the differential equation and transfer function corresponding to the model were deduced. Frequency characteristics calculation of the digital closed-loop FOG ...
Precise Imaging Processing for Spaceborne Spotlight SAR
WANG Guo-dong, ZHOU Yin-qing, LI Chun-sheng
2002, 28(6): 643-647.
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Signal properties of spaceborne spotlight SAR were discussed. The relationships of centroid Doppler, Doppler bandwidth and PRF(Pluse Repetition Frequency) with squint angle were analyzed. Based on a modified Chirp Scaling algorithm, a subaperture method was used in this algorithm. With the subapertu...
Image Processing Method to Detect Seam Track of Thin Sheets
WU Xin, QI Bo-jin, WU Hong-jie
2002, 28(6): 648-651.
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Aiming at automatic welding of butt and lap joints of the seam track of the key components of aviation engine by means of CCD camera direct shooting to obtain seam track, a relatively universal algorithm and thought was put forward including detecting edge points and obtaining edge line. Several key...
Numerical Simulation of 3D Viscous Flow in Exhaust Casing of a Low-Pressure Steam Turbine
XU Xu, KANG Shun, JIANG Hong
2002, 28(6): 652-655.
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Numerical results of a 3D viscous flow in an exhaust casing of a low-pressure steam turbine were obtained with the 3D Navier-Stokes solver Fine/Turbo. Good agreements with the available experimental data in velocity, static and total pressure coefficients were exhibited. The computational results re...
Optimization Selection in Conceptual Design of Advanced Trainer Aircraft
HUANG Jun, HUAI Jin-peng, WU Zhe
2002, 28(6): 656-659.
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Improved cost-efficiency ratio is a major factor considered in the development of trainer aircraft. Operational analysis was introduced as a method for evaluating training effectiveness of trainer aircraft. Approaches to the engineering estimation of aerodynamic characteristics for aircraft with dou...
Modeling of Selective Laser Sintering for PC Powder
PC Powder, ZHAO Bao-jun
2002, 28(6): 660-663.
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Numerical computation model for the thermal process of selective laser sintering of powders were presented to predict the sintered depth in selective laser sintering．The factors of the material thermal physical properties varing with the temperature and the un-uniformed distribution of laser intensi...
Carrier Tracking Technology of High Dynamics Spread Spectrum Signal Based on Software
REN Jun-tao, SHAO Ding-rong, LI Shu-jian
2002, 28(6): 664-667.
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In high dynamics environment, the movement of object changes sharply, so the transmitted signal has some special characters: larger Doppler frequency shift, the first order derivative and the second order derivative. It is difficult to demodulate correctly. A method of compound software loop of trac...
Experimental Investigations of Atomic Oxygen Effects on a Carbon Fiber/Epoxy Resin Composite Material
ZHAO Xiao, SHEN Zhi, XING Yu, MA Shu
2002, 28(6): 668-670.
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When used in spacecrafts, carbon fiber/epoxy resin is affected severely by many factors of space environment, especially the atomic oxygen effect. Experiments were constructed to investigate the atomic oxygen erosion effect of this material with a ground-based simulation facility, and as a function ...
Simulation Study on the Thermodynamics System of Aircraft Avionics Pod
DONG Su-jun, LIU Meng, WANG Jun
2002, 28(6): 671-674.
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Simulation model of the thermodynamics system of aircraft avionics pod was established and its dynamic characteristics of thermal load and main temperature parameters during the whole flying were obtained, which assisted in the selection and verification of the refrigeration system. In addition, a v...
Computation of Transonic Turbulent Flow Around a Blunt Nosed Short Body at Large Angle of Attack
WU Zong-cheng, ZHU Zi-qiang, LI Jin, CHEN Ze-min
2002, 28(6): 675-678.
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The transonic turbulent flow around a blunt nosed and short body at large angle of attack was calculated and analysed by using numerical simulation method to solve the full N-S equations. In the computation, Van Leer's scheme was used to discretize the inviscid flux terms and a new limiter function ...
Robust Fault-Tolerant Control Design for a Class of Sensor Failures
YAN Xi-jun, GAO Jin-yuan
2002, 28(6): 679-681.
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Considering the uncertainty of a linear system and a class of sensor failures including the reduction of sensors gains, the switching-on-off of sensor channels, and the switching-off of sensor channels, a method of robust fault-tolerant using LQR theory was studied. The resulting design guaranteed c...
Experimental Study on Fuzzy Control of Transient Aerodynamic Heat Flow of Missile
WU Da-fang, GAO Zhen-tong, WANG Yong-hai
2002, 28(6): 682-684.
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The characteristics of transient heating control process of aerodynamic simulation experiments are complicated, transient, high non linearity and strong coupling, which make it difficult or impossible to get a mathematical model. By using fuzzy control method,many good qualities (such as robust, hig...
Method of Short Interleaver Design for Turbo Codes
REN Jun-tao, SHAO Ding-rong, QI Feng, ZHANG Bo
2002, 28(6): 685-687.
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The interleaver structure plays a very important role to the bit error rate performance of Turbo code. The periodic character of the feedback minimum polynomial and the divisibility character of the input information sequences were analyzed. Some interleavers were found that can change the divisible...
Research of Notchback Automobile Wake Structure
ZHANG Qun-feng, Lü Zhi-yong, QIN Yan-hua
2002, 28(6): 688-691.
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The aerodynamical drag of a automobile directly influences its fuel comsumption. For a notchback automobile, its aerodynamical drag relateded with the rear shape amounts to nearly 50 percent of the total aerodynamical drag. Therefore, it is important to make the wake structure clear for designing au...
Neural Network Data Fusion for Maneuvering Targets Tracking
BI Jing, WANG Qing, SHI Xiao-rong
2002, 28(6): 692-694.
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A neural network data fusion approach for radar/infrared dual mode guidance was presented.By taking a neural network consisting of one neuron for each component of the measurement vector as the fusion center, the infrared measurements were fused first to keep synchronous with the radar measurements ...
Optimum Search in Terminal of Midcourse Guidance
JIANG Yu-xian, ZHANG Hua-ming
2002, 28(6): 695-698.
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The optimum searching problem, in which beyond-line-of-sight missile flying in the terminal of midcourse guidance searches the moving target automatically to maximize the probability of acquisition by use of the residual propellent was studied. The position-probability distribution of moving target ...
GPS/DRS/DMAP Vehicles Navigation and Location System
GAO Peng, FU Li, FAN Yue-zu
2002, 28(6): 699-702.
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A dead reckoning system (DRS) based on MCU was expatiated, which was composed of compass, rate gyroscope and odometer and its essential theory. On the above basis, a novel multilevel filtering GPS/DRS vehicles navigation and location system was designed. Positioning accuracy was further improved by ...
Eye-Moment Analysis of Simulating Airplane Landing Course
LIU Zhong-qi, YUAN Xiu-gan, LIU Wei, WANG Rui
2002, 28(6): 703-706.
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The distribution of subject's attention was studied by analyzing his eye movement principle. Through simulating the airplane's landing course, eye's fixation point and velocity data were collected by using EMMS. Analysis was made to the shift of the subject's vision and the primary processing and co...
Optimizing Dispatching of Public Traffic Vehicles in Intelligent Transport Systems
ZHANG Fei-zhou, YAN Lei, FAN Yue-zu, SUN Xian-fang
2002, 28(6): 707-710.
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The basic principles of Genetic Algorithm (GA) and Tabu Search(TS) were expatiated on. Both of optimizing algorithms were availably integrated into Hybrid Genetic Algorithm (HGA). With regard to actual status and operation environment of Public Traffic Vehicles (PTV), intelligent dispatching of PTV ...
Mechanism and Effect of Vibration Suspression Using Two Squeeze Film Dampers
LI Lin, WANG Bao-feng
2002, 28(6): 711-714.
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For researching the function of two Squeeze Film Dampers on steady unbalance and transient vibration of rotor system, a single-disk flexible rotor model was developed and analyzed with transfer coefficent method. It could be seen that the mechanism and effect of vibration suspression are different f...
Grinding of Ballend Cutter on Virtual Axis Machine Tool
LI Wei, FAN Rui, CHEN Wu-yi, CHEN Ding-chang
2002, 28(6): 715-718.
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Working principle of a virtual axis machine tool was analyzed. Curve equation of ballend cutter blade was established. Using moving frame methods, a mathematical model of rake face and flank face was inferred. According to the mathematical model of ballend cutter tool and inverse solution model of t...

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