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2001 Vol. 27, No. 6

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Vibration of Separators in High-Speed Ball Bearings
LAI Yong-jun, LU Zhen
2001, 27(6): 619-622.
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Dynamics equations are established respectively for separators and balls of a high-speed ball bearing on the base of elector-hydro-dynamic lubrication. A model is proposed to describe the response of the separator, which was proved reasonable and reached a desirable results. On the above basis, it i...
Experimental System of Serial-Parallel Micromanipulator
ZHAO Wei, YU Jing-jun, BI Shu-sheng, ZONG Guang-hua
2001, 27(6): 623-627.
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An experimental micromanipulator system was established based on a novel serial-parallel micro-motion mechanism used for micromanipulation. Considering the characteristic of the mechanism, by combining the micro vision system of computer with a capacitive micrometer, a convenient and effective kinem...
Analysis on Fluid Field of High Speed Magnetic Fluid Seal
ZHAO Guo-wei, CHI Chang-qing, WANG Zhi-shan, WANG Gua
2001, 27(6): 628-631.
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The hypothesis of velocity linear distribution in wedge-shaped gap is often used to analyze the fluid field in high speed magnetic seal. But the result can not satisfy Navier-Stokes equation completely. So, two new methods are proposed to deal with the problem. One is based on the hypothesis of line...
Experimental Investigation of Load Decay of the Seal O-Ring
WANG Guang-zhen, CHI Chang-qing, WANG Zhi-shan, ZHAO Guo-wei
2001, 27(6): 632-635.
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Experimental research on load decay of two kinds of O-ring made of different silicone rubber under different temperature has been conducted. The results show that the load decay characteristic of the O-ring is related to the material of the O-ring, and temperature can change load decay characteristi...
Method of Flying Dynamic Real-Time Forecast Based on BP Neural Network
WANG Shu-ming, XIA Guo-ping
2001, 27(6): 636-639.
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The disadvantages of the traditional BP neural network include low speed of convergence, high sensitivity and indefinite layers, etc. This paper develops a new BP network model, which can improve the quality of the real time and precision, and applies the developed BP network model to the dynamic fo...
Empirical Study on R&D Projects Termination
GUAN Jian-cheng, LIU Quan, CAO Yan-bin
2001, 27(6): 640-643.
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On the basis of the experience of relevant experts and relevant literatures, the authors propose a variable set for evaluating ongoing R&D projects. An improved Fuzzy pattern recognition method is further presented and applied successfully to terminating decision for ongoing R&D projects of ...
Research of Task Scheduling in NetworkParallel Computing Environment
HU Kai, ZHANG Yi, HU Jian-ping
2001, 27(6): 644-648.
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Clusters of workstations on common network are much increasing being used as cost-effective parallel computing platforms. Task scheduling is one of the crucial problems in cluster computing. A new scheduling graph model is developed to present a kind of special parallel program, which solves synchro...
Analysis and Design of Aeronautical Telex Processing System
HE Guo-bin, MA Shi-long
2001, 27(6): 649-653.
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Aeronautical Telex Processing System(ATPS), which can be applied widely in civil aviation, is a software processing the aeronautical telex that acts as information media among civil aviation departments. There are many shortcomings such as poor universality, bad integrality, improper way of data pub...
Calculation and Simulation of Transient Heat Load for Cabins
FAN Wei-qiang, ZHUANG Da-min, YUAN Xiu-gan, LI De-gang
2001, 27(6): 654-657.
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On the base of design for new fighter planes, a method for calculating and simulating transient heat load for cabins has been proposed. The method gets the temperature of every wall of a cabin by calculating equations controlled by coupled heat conduction, convection and radiation.This paper analyze...
Drag Reduction Technique of Cylinder and Mechanism Research
TAN Guang-kun, WANG Jin-jun, LI Qiu-sheng
2001, 27(6): 658-661.
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Abstract:
The hydrogen bubble flow visualization technique has been used to study the flow around a hollow circular cylinder with several splits and the drag reduction mechanism. The experiments cover the cylinder with different number and arrangement of splits, different angle of attack. The primary criterio...
Image Acquisition Research in DPIV
WEI Run-jie, SHEN Gong-xin, DING Han-quan
2001, 27(6): 662-665.
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This paper firstly proposes the phenomena that the diameter of particle image obtained is larger than usual with the increase of aperture stop diameter in short object distance image acquisition in PIV measurement which was called spherical aberration. Then the solution was acquired directly by reso...
Experimental Study of Supersonic Jet Flow Using DPIV
DAI Qin, WEI Run-jie, HUANG Zhan, SHEN Gong-xin
2001, 27(6): 666-669.
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Experimental study of supersonic jet flow using digital PIV system with frame straddle CCD camera is introduced in the paper. The diameter and Mach number of the Laval nozzle exit are 13.8mm and 1.5 respectively, the vector field and wave patterns of the jet flow in different pressure ratio of the s...
Experimental Investigations of Atomic Oxygen, Temperature, Ultraviolet Radiation Effects on a Spacecraft Material-Kapton
ZHAO Xiao-hu, SHEN Zhi-gang, WANG Zhong-tao, XING Yu
2001, 27(6): 670-673.
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Experimental investigations of atomic oxygen, temperature rise, ultraviolet radiation effects on Kapton, a spacecraft material in common use, were conducted using atomic oxygen effects ground-based simulation facility. The samples aspect, mass and surface morphology before and after experiment was c...
Topological Structure Evolution and Stability of the Cross Flow Pattern Around a Slender
LI Guo-hui, DENG Xue-ying
2001, 27(6): 674-676.
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Topological structure and stability of a slender cross flow at different angles of attack was discussed by the stability theory of dynamic system. It was proved that the development of slender vortices leads to the change of topological structure about cross flow. And it is the change from stable an...
Influence of the Twin Vertical Tails on the Aerodynamic Characteristics
Lü Zhi-yong, LI Jian-qiang, QIN Yan-hua, HANG Hua
2001, 27(6): 677-680.
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In the study of the advanced aerodynamic fighter configuration,the location of twin vertical tails is always an important problem. In this paper, a fighter model of canard configuration was studied. The study includes three parts: measurement of aerodynamic force, flow visualization and PIV experime...
Influence of Sintering Temperature on Fracture Toughness for High Toughness Alumina Ceramics
LIU Tong, LIU Wen-ting
2001, 27(6): 681-683.
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The fracture toughness of hot-pressed alumina ceramics at different sintering temperatures was examined. The high fracture toughness alumina samples were made from low-temperature-calcined α-alumina powder prepared from aluminum hydroxide by seeding of wet grinding abrasion powder. As the sintering ...
P-S-N Curve of Fatigue at Low Temperatures of Welded Components
JIA Xing-lan, LIU Wen-ting
2001, 27(6): 684-686.
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The P-S-N curve of fatigue at low temperatures is the design basis against fatigue of welded components in winter. The fatigue life of welded components at -25℃ temperature was measured on PLG-300 kN high-frequency fatigue testing machine at four stress levels, and the S-N curve of welded components...
Effect of Tabs on the Thrust of a Convergent Nozzle
HUANG Yong, GUO Zhi-hui, WEI Fu-qing, WU Shou-sheng
2001, 27(6): 687-689.
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An experimental investigation on the effect of tabs, which is fixed on the exit of a convergent nozzle, to thrust characteristics has been conducted at both subcritical and supercritical flow conditions. The variable parameters of tabs are block ratio, inclined angle and the number of tabs. The expe...
Prediction of the Response of SMA Superelastic Systems Under Stationary Random Excitation
YAN Xiao-jun
2001, 27(6): 690-693.
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With an advantage that the motion equation of the system can be linearized directly in closed form, a simple superelastic model for SMA (Shape Memory Alloy) was proposed in the equivalent linearization method. The method was employed to predict response of SMA superelastic system under stationary wh...
Optimal Design for Sculling algorithms of SINS
GENG Yan-rui, WANG Yang-zhu, CUI Zhong-xing
2001, 27(6): 694-697.
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High speed and accuracy sculling compensation algorithm plays a key role in strapdown inertial navigation system(SINS). A fresher research on sculling compensation algorithms and their error characteristics is made. The equations of sculling coefficients and of the errors are derived first, then 17 ...
Parity Vector Compensation for Multi-Sensor Fault Detection
WEI Chun-ling, ZHANG Hong-yue
2001, 27(6): 698-701.
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A scheme based on neural network is presented to improve the fault detection and isolation (FDI) performance of a redundant strapdown inertial measurement unit. The neural network is trained to eliminate the effects of input axis misalignment, scale factor error and biases on parity vector. One adva...
Application of Local Observability Theory in the In-Flight Alignment of INS/GPS
LIU Zhun, CHEN Zhe
2001, 27(6): 702-705.
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Based on the study on the observability, the local observability theory has been used in INS/GPS integrated system, the condition number of local observability matrix in various maneuver modes have been computed, and the optimal maneuver mode has been found. It has been shown by the research results...
Fault Diagnosis Expert System for Aircraft Electric Power System
ZHU Xin-yu, SHEN Song-hua
2001, 27(6): 706-708.
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Based on artificial intelligence theory, the authors developed aircraft electric power system monitoring unit. By using expert system theory, some aircraft electric power system across-the-aboard has been analyzed. The state monitoring and fault diagnosis can be carried out and the information of ab...
Study on Three Dimensional Scattering Distribution of Complicated Targets
LIU Jiu-wen, LI Jian-hui, HAN Xue-wen, LI Qing
2001, 27(6): 709-712.
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By setting up the numerical model of a complicated target, applying outside normal vectors of visible patches of each individual body, and useing Z-buffer algorithm to solve shielding between multi-bodies of complicated targets, the three dimensional scattering problems are analyzed successfully. Th...
Influence of Nonstationarity on SAR Imagery Models and De-Speckling Filters
MA Zuo-min, MAO Shi-yi, LIU Xiang-lin
2001, 27(6): 713-716.
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From the stochastic process point of view, Synthetic Aperture Radar (SAR) images are divided into four cases as stationary within resolution cell, nonstationary within resolution cell, stationary within local processing window and nonstationary within local processing window according to their stati...
Research and Development on the Stamping Die CAD System of Aircraft Sheet Metal Parts
YUAN Hui, WAN Min, LI Xin-jun, ZHENG Shuang-lin
2001, 27(6): 717-720.
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Using AutoCAD2000 as developmental platform and Sybase as DBMS, the stamping die CAD system of aircraft sheet metal parts is studied based on the developmental software (Visual Lisp and VBA of AutoCAD) and Ashbase (Aircraft sheet metal forming database). The parameter drawing for the standard parts ...
Development of Novel Composite Baton
SUI Gang, ZHANG Zuo-guang, ZHONG Wei-hong, SUN Yan
2001, 27(6): 721-724.
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Abstract:
The baton is one of routine equipment for armed policeman ensuring public security. The inside of traditional baton is made of metal component. So the whole baton is heavy and cause hand vibrated, and even have a danger to hurt opponent. The novel composite baton was researched detailedly in this pa...
Quantitative Analysis of Surfactant in the Degreasing Solution
QIAN Jian-gang, LI Di, GUO Bao-lan
2001, 27(6): 725-728.
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Aliphatic alcohol polyoxyethylene ether(OS-15,a nonionic surfactant) and sodium dodecyl benzene sulfonate(SDBS,an anionic surfactant) in the degreasing solution were analyzed quantitatively by the method of sodium tetraphenylborate recoil titration and ultraviolet spectroscopy respectively.It is sho...
Localized Nuclear Reactions and Dynamic Casimir Effectin Electrochemical Process
JIANG Xing-liu, WEN Xiong-wei, ZHANG Jian-gang, HAN Li-jun
2001, 27(6): 729-732.
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Localized nuclear activations in electrochemical process have been observed by CR-39 solid detectors, autoradiography and energy dispersion X-ray analysis of Pd cathode electrolyzised in light and heavy water. Nuclear reactions and excess heat in electrolysis process were interpreted by two mechanis...

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