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1999 Vol. 25, No. 4

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Conductive Rubber Composite of SIS/LPB/Pan
Chen Yichi, Yin Wusheng
1999, 25(4): 375-377.
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SIS(styrene-isoprene-styrene)/LPB(liquid polybutadiene) rubber matrix by the in-situ polymerization to form a mono-face conductive rubber complex.The effects of the crosslinking degree of the polymer matrix,the amounts of aniline and the oxidant,as well as the polymerization time on the conducting p...
Experimental Study on UHMWPE (Dyneema UD66) Fiber Composite Armors
Zhang Daxing, Zhang Zuoguang, Zhong Weihong, Sun Zhijie
1999, 25(4): 378-380.
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The variation of the ballistic absorption energy of Dyneema UD66 fiber composite,an ultra-high molecular polyethylene fiber reinforced composite,with molding pressure,areal density and projectile velocity is studied.The molding pressure of UD66 fiber composite has direct effects on the ballistic abs...
Control of Message Priorities for Token Passing Networks
Xiong Huagang Luo Zhiqiang Li Jingsheng
1999, 25(4): 381-383.
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The transmission mechanism of the messages with their priorities for token passing networks was studied.A new method to determine the value of token rotation timers is proposed,which makes messages to be transmitted according to their maximum allowable latency sizes,from small to big,and meets all t...
Design and Realization of GLONASS Receiver Frequency Synthesizer
Liu Hui, Zhang Qishan
1999, 25(4): 384-387.
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A GLONASS receiver front end structure and its frequency synthesizer part are given based on the GLONASS frequency plan. The synthesizer is realized with integrated PLL frequency synthesizer. It is easy to be constructed and also has the advantage of good stability. The design details of the frequen...
Multi-reflection Calculation of RCS and Programing
Han Xuewen, Lü Shanwei
1999, 25(4): 388-391.
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The method to calculate the multi-reflection in RCS is discussed. It mainly considered the interaction of facet and facet by using the geography optics(GO) and physical optics(PO) in calculation . In the calculation of the total RCS, we also use the equivalent currents method(ECM) to calculate the c...
Representation of Signal in Tight Wavelet Frame and Best Wavelet Base
Yuan Yunneng, Mao Shiyi
1999, 25(4): 392-397.
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The subject on the representation of signal in tight wavelet frame and the selection of the best wavelet base was discussed. The relation between the wavelet frame representation and the wavelet base representations, which is very useful for interpreting the wavelet frame representation, is describe...
Research on Problems of Motion Compensationin Chirp-scaling Algorithm
Li Liwei, Jia Hongjiang, Asif Raza, Mao Shiyi
1999, 25(4): 398-401.
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The chirp-scaling algorithm(CSA) performs better than the range-Doppler algorithm(RDA) under deep squint angle and large imaging scene by avoiding interpolation. For SAR image formation process, autofocus algorithm is usually necessary, but most current autofocus algorithms are based on RDA. This pa...
Flat Earth Removal and Denoising in InSAR Images
Hu Qingdong, Mao Shiyi
1999, 25(4): 402-405.
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Thermal and "Speckle" noise is an obstacle to generate digital elevation model(DEM) from the interferogram by 2-D unwrapping of Interferometric SAR. The boxing and median filters effects on reducing the noise are investigated in detail in this paper. Especially for the single complex images, it is m...
Studies for System Reaction Time of Phased Array Radar
Yang Chenyang, Mao Shiyi, Li Shaohong
1999, 25(4): 406-409.
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The system reaction time of phased array radar is studied. The formula to compute the reaction time is proposed when TWS and TAS tracking mode are applied in phased array radar. The relationship between the reaction time and the searching, tracking and acquisition mode and their parameters are estab...
Method of Anti-interference Information Processing based on System with Random Changing Structure
Wu Sentang, Xu Guangfei, Tang Yong
1999, 25(4): 410-413.
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In the complex environment of interference confrontation,to solve the accuracy problem of increasing information processing(for example,tracking problem of maneuvering targets with many sorts of means of interference confrontation). This paper presents a new method of anti-interference information p...
Application of General Orthogonal Polynomials on Tracking Problem of Time-varying Systems Optimal Control
Wu Bin, Cheng Peng
1999, 25(4): 414-417.
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A new method is presented for solving the tracking problem of time-varying systems optimal control. The approach starts by applying general orthogonal polynomials operational matrices and using finite GOPs expansion to approximate state, control variable and performance index, then differential equa...
Suboptimal Filter Algorithm of Initial Alignment in Inertial Navigation System
Wang Danli, Zhang Hongyue, S.I.Gubarenco
1999, 25(4): 418-421.
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The dynamic error vector equation of the initial alignment in an inertial navigation system and the observability problem of the dynamic error vector are analysed.The system state space is divided into observable subspaces by using the observable degree of the dynamic error vector.In the initial ali...
Theoretical Analysis for Squeeze Film Damper withElectrohydraulic Active Control
Li Yunhua, Wang Zhanlin
1999, 25(4): 422-425.
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Aiming at the problems existed in rotating machinery using traditional squeeze film damper combined with dynamic pressure bearing, a project of the hybrid oil film bearing composed of dynamic pressure and static pressure with piezoelectric crystal electrohydraulic active control supply orifice hole,...
Scheme Analysis of Power-by-wire Airborne Actuation Systems
Qi Xiaoye, Fu Yongling, Wang Zhanlin
1999, 25(4): 426-430.
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An overview is given of various power-by-wire(PBW) airborne actuation systems currently demonstrated, along with descriptions of their mechanism of operation. After discussing advantages and disadvantages of existing PBW actuation systems, two kinds of new PBW actuation systems, the electromotor-pum...
Adaptive Control of Systems with Unknown Dead-zones
Jing Shaoguang, Song Zishan
1999, 25(4): 431-433.
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Dead-zone nonlinear characteristics are encountered in many physical components of control systems. They are usually unknown and may vary with time. A robust model reference adaptive controller with an adaptive inverse of dead-zone is developed. Based on the parameter match equation of adaptive cont...
3-D Numerical Analysis of Axial Skewed Slotted Hub Treatment
Li Ling, Lu Yajun
1999, 25(4): 434-437.
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The 3-D incompressible steady time -averaged N-S equation , K-ε turbulence model equations based on RNG method are applied to calculate the flowfield in the compressor cascade passage with axial skewed slotted hub treatment .By using the method of zonal grids, single grid system with lapped zones wh...
Analogous Criteria of Leakage Flow and Heat Transfer in Labyrinth Seals
Yang Huitao Cao Yuzhang
1999, 25(4): 438-441.
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Abstract:
Some criteria analyses were made to investigate the effect of rotating,etc. On leakage flow and heat transfer in labyrinth seals.A series of analogous criteria for experimental simulation were driven from the method of directional unit system.The principle of directional unit system is suggested tha...
Implementation of Elliptic-type Conditional Moment Closure Model to Nonpremixed Turbulent Reacting Flows
Liu Tao, Liu Gang, Fang Ren, XU Kanglie
1999, 25(4): 442-446.
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The conditional moment closure (CMC) formulation considering both molecular and turbulent diffusions is derived and applied to simulate two dimensional nonpremixed turbulent reacting flows. Calculated results show good agreement with experimental ones. Results show that finite Damkohler number makes...
Research on Robust Stability of Multiloop　Aeroservoelastic System
Sun Wei, Zou Congqing
1999, 25(4): 447-450.
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Abstract:
Research on a multiinput-multioutput(MIMO) aeroservoelastic (ASE) system was presented on the basis of modern control theory. The small gain theory and minimal singular value theory were applied to the control system which was equipped with the coupled roll and yaw loop. The stability scope of the a...
Experiment Research of New-type Pressure Control Technology on Rapid Train's Cabin
Zhang Xingjuan, Yuan Xiugan, Wang Changhe, Mei Zhiguang
1999, 25(4): 451-453.
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When two rapid trains travel in tunnel or encounter, there will take place enormous pressure wave which makes passengers uncomfortable. In order to release the pressure wave, the new-type pressure control technology which borrow ideas from airplane's cabin pressure control program is analog tested. ...
Mathematical Models of Human Thermal Regulation System
Zhao Chaoyi, Yuan Xiugan, Sun Jinbiao
1999, 25(4): 454-457.
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The human thermoregulatory system is introduced in the paper at first. The study status for the mathematical models of human thermal regulation system is surveyed. A comparative review of characteristics of several existing human thermal models is undertaken. The models receiving consideration in th...
Study of Image Real-time Compression Technique
Cheng Zijing, Zhou Xiaokuan, Zhou Fugen, Wang Fei
1999, 25(4): 458-461.
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An image real-time compression system based on multiple-mode adaptive compression algorithm has been developed .The system comprises several processors working in parallel mode ,and each processor adopts pipeline working pattern ,so the capacity and the data processing speed of the system are adjust...
Study on Effect Tail Clearance Angle in NC Sharpening of Twist Drills
Lü Yanming, Fan Rui, Chen Wuyi, Chen Dingchang
1999, 25(4): 462-466.
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Through studying the flank face geometry of twist drills, a new concept of effect tail clearance angle is proposed. A method for calculating the effect tail clearance angles is given. The relations between grinding parameters and the effect clearance angles are studied.This paper also shows how to u...
Design of Flexural Vibration Holder for Vibration Cutting
Zhang Deyuan, Wu Bo, Li Guangjun, Dong Baoli
1999, 25(4): 467-470.
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The resonance frequency and nodal pitch of symmetrical three-step flexural vibration holder have been calculated precisely based on Timoshenko beams theory, and the 3D curved surfaces displaying the variations of the resonance frequency and nodal pitch with the tool holder sizes have been drawn by a...
Study on Global Construction of B-Spline Surface by Deformable Model
Xi Ping, Jing Ling, Tang Rongxi
1999, 25(4): 471-474.
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The surface modeling techniques in current CAD systems are generally based on the purely mathematical theories of parametrically described geometry. It is very difficult to design interactively fair surfaces which interpolate given data points or boundary curves. Physics-based modeling techniques ar...
Peeling Stress Analysis of Honeycomb Sandwich Structure
Guan Shiwei
1999, 25(4): 475-477.
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This work investigated honeycomb sandwich structure with mathematical analysis and experimental verification in order that the deformation of the face-sheet and the stress in the honeycomb-core of honeycomb sandwich structure under peeling load can be obtained. The theory of beam on elastic foundati...
Material Selection Information Model Study Based on STEP Standard
Jiang Xuefeng, Xiao Ling, Deng Jiati
1999, 25(4): 478-481.
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Material selection information model was established for product lifecycle with STEP standard. The information model gives physical property,machine property,technology property,material price for the reality requirement by material data manual. The paper puts forward material selection ways of diff...
Application of Input-output Production Function to Make Production Plan
Zheng Yun, Wei Fajie
1999, 25(4): 482-485.
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The application of input-output production function to make production plan outline and product scheduling of make-to-order enterprises are studied. The manufacturing system is divided into production nodes or process centers. According to the rule of dividing the manufacturing system, the route of ...
Method for Dynamic Modeling of Flexible Manipulators
Bian Yushu, Lu Zhen
1999, 25(4): 486-490.
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A method was presented for establishing the dynamic equation of the flexible multi-link manipulator with flexible joints. Firstly, the simplified models of a flexible joint and a flexible link are described respectively, then based on Kane's method and assumptive modes method, the complete dynamic e...
Method for Vibration Control of Flexible Redundant Manipulators
Bian Yushu, Lu Zhen
1999, 25(4): 491-494.
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For a flexible manipulator, how to eliminate vibration caused by the structural flexibility as soon as possible is very important. In this paper, the theory and strategy of vibration control for flexible redundant manipulators are studied. The idea of active damping control is used to suppress vibra...
Precedence Relation Matrix of Increasing Expansion
Huang Rongying, Wang Zhisen
1999, 25(4): 495-497.
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The processing precedence relation of the dynamic variations in the concurrent process planning is described with the expansion matrix,which forms the generative process of the matrix with the state transformation and the expansion process with the iterative increment.The main algorithm steps are as...

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