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1998 Vol. 24, No. 2

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Study of Surface Characteristic with Microwave Plasma Treated Amorphous Alloy Coating
Zhu Liqun, Zhong Qunpeng, Kazuo Sugiyama
1998, 24(2): 125-128.
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Ni-W,Ni-W-B amorphous alloy coating is modified by means of microwave plasma treatment and the effect of the modification on the structure,surface component ,corrosion and oxidation resistance of Ni-W,Ni-W-B amorphous alloy coating is studied. The results show the corrosion-resistance (in H2SO4,HNO3...
Study of Electropolymerization of Diacetone Acrylamide on Carbon Fiber Surface
Zhang Fusheng Wu Yu, Zhuang Yan
1998, 24(2): 129-132.
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The electropolymerization (EP) of diacetong acrylamide (DAA) and acrylic acid/DAA on Carbon fiber Surface and the effects of EP coating upon performance of Epoxy unidirectional CFRP were studied . The shear strength of CFRP was significantly improved from 45.57 MPa to 70.36 MPa and 81.24 MPa respect...
Design of Slotted Linear Array in a Camrectangular Waveguide
Lü Shanwei, Gao Wenjun, Li Sichao, Diao Hainan
1998, 24(2): 133-136.
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A new waveguide which can change the wide wall of a rectangular waveguide into a symmetric arc wall is named as a camrectangular waveguide.Comparing to sectoral waveguide,the new waveguide has the same voltage characteristics and is easier to be produced and fixed.An approximate formula of the domin...
Theory and Development of Electrical Impedance Tomography Technology
Cheng Jikuan, Sun Jinping, Du Yan, Liu Zhongkan
1998, 24(2): 137-140.
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Electrical Impedance Tomography(EIT) is a new technique that forms images of electric resistivity or conductivity within the body through measuring the current or the voltage of the surface. As a mathematical physics inverse problem,EIT is a developing technique on its own feature and difficulty.Thi...
Numerical Calculation of Scattering Characteristics from PerfectlyConducting Cylinder Coated with Dielectric Material
Huang Xingzhong, Lü Shanwei
1998, 24(2): 141-144.
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The general scattering field expressions are given when the plane wave propagates to a perfectly conducting cylinder coated with radar absorbing material and its scattering fields are calculated comprehensively.The method to calculate Bessel function and Hankel function with imaginary argument is di...
Data Link Design for Automatic Vehicle Location Systemwith High Capacity and Precision
Wu Shaochun, Li Xianliang, Zhang Qishan
1998, 24(2): 145-148.
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Abstract:
The present automatic vehicle location system (AVLS) has some defaults such as smaller capacity,alarm collision and lower precision etc.Based on the characteristic analysis of AVLS and slot ALOHA (SALOHA),a new method of data link design,which is called Broadcast Reserved ALOHA (BRALOHA),is proposed...
Capacity and Channel Design of Small Telemetry System
Li Sanzhong, Li Xianliang, Zhang Qishan
1998, 24(2): 149-152.
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Some problems about overall design of a small unmanned air vehicle telemetry system are presented in this paper.The construction and fundamental principle of the telemetry system is simply introduced.According to the telemetry task requirement,the key problems which should be solved at first are dem...
Analysis of the Terminal Seeker Presetting Accuracy due to the Guidance Radar Errors
Zhao Hongliang, Mao Shiyi, Li Shaohong
1998, 24(2): 153-156.
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The tactical missile seeker handover accuracy from midcourse to terminal guidance is researched.The small perturbation method is proposed to analyse error sensitivity of the seeker presetting parameters from error sources.Firstly,the terminal guidance seeker presetting parameters are computed,based ...
Reseanloop Model for the Scattering Field of the Target
Yu Yang, Wang Baofa, Zhou Yinqing
1998, 24(2): 157-160.
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The resean loop mothed for solving the scattering field of complex targets in resonance region is presented.The idea of wire grid is using the induction current flowing on the three dimensional wire grids to simulate the continuous conduct surface excited by the incident electromagnetic wave.Unlike ...
Weighted NewtonRaphson Algorithm for Electrical Impedance Tomography
Du Yan, Liu Zhongkan, Cheng Jikuan
1998, 24(2): 161-164.
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A proper weight matrix is used to improve the NewtonRaphson algorithm for the electrical impedance tomography image reconstruction,and a weighted NewtonRaphson algorithm is proposed.The new weighted algorithm can overcome the defect of baddistributed resolution for reconstructed image by using origi...
Application of Fuzzy Inference Compound Method to Resistance Furnace Temperature Control System
Wang Wenshun, Wan Rui
1998, 24(2): 165-169.
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According to the characterestic of resistance furnace temperature control,temperature rising oneway control,large time delay and timevariation of parameter,using method of fuzzy compositional rule of inference establish fuzzy model and design fuzzy cntroler.In order to increase control system precis...
Study on Grid Generation of Gas Turbine Combustor
Xu Hang, Yang Rong
1998, 24(2): 170-173.
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Abstract:
The interactive grid generation method has been studied.The 3D bodyfitted grid for whole combustor,which is composed of diffuser,outer and inner annular combustor,has been generated.The better density and orthogonality of grid could be achieved,The primary,dilution and film cooling holes on the line...
Effects of 3D Flow on Aerodynamic Stability of Axial Flow Compressor
Cao Renjing, Zhou Sheng
1998, 24(2): 174-177.
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Concerning the models for discribing aerodynamic stability of axial flow compressor,the original model is onedimensional,and it is reasonable for the onset of surge only.For the onset of rotating stall,there are just some twodimensional models at published literatures.A threedimensional aerodynamic ...
Turbulent Intensities Distributions over a Riblets Surface
Wang Jinjun, Lan Shilong
1998, 24(2): 178-180.
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The LDV technique has been used to measure the turbulent intensity distribution of turbulent boundary layer flow over a riblets surface.The experimental results indicate that,in comparision with the smooth surface results,the maximum value of turbulent intensity is smaller,but its occurrence positio...
Correlative Analysis between Pressure Distributions and VortexPattern of DoubleDelta Wings at High Angles of Attack
Feng Yanan, Zheng Bo, Quan Shaoping
1998, 24(2): 181-184.
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The pressure distributions on two models of doubledelta wing were measured in the low speed wind tunnel in BUAA.They are 75°/45° and 75°/60° doubledelta wings with sharp or round outboard leadingedge.The analysis indicates that two peaks of the pressure distributions on some typical cross sections o...
Unsteady Flow Behaviour of a Slender Delta Wing Rock
Xia Xuejian, Liu Rizhi, Yang Xiaofeng
1998, 24(2): 185-188.
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The flow visualization of vortex behaviour for the two conditions of static and dynamic during wing rock motion was conducted and photograph records were taken for a slender delta wing in a various roll angle at α=30 ° and 40°.Results indicated that the vortex behaviour was quite different at the sa...
Calculating Method of Aerodynamic Heating for Space Shuttles
Shen Xialing
1998, 24(2): 189-192.
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Approximate methods for calculating aerodynamic heating rates on space shuttles are discussed.Various methods are given for predicting the heating rate at axisymmetric stagnation points,general three dimensional stagnationpoints and the leading edge stagnation point of wings.Numerous laminar and tur...
Calculation of the Electromagnetic Scattered Field and Radar Cross Section
Xue Xiaochun, Li Zongrui, Zhu Ziqiang, Dong Jinming
1998, 24(2): 193-196.
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The paper focus on the description of the dimensional distribution of the timedomain scattered electromagnetic field around a 2D body and Radar Cross Section ( RCS ).The calculation of electromagnetic field usually conforms with the frequencydomain.A high frequency calculation method is mainly adopt...
Effects of Airfoil Geometric Parameters on Wing's Scattering Characteristics
Ma Dongli
1998, 24(2): 197-199.
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The effects of airfoil geometric parameters on wing's spacial and polarized scattering characteristics have been systematically revealed.The results of the study indicated that the calculating value of diffraction from trailing edge by using the formula of the straight wedge is very far from experim...
Experimental Studies of Impact Protection Performance of Aircrew Helmet Typical Component
Chen Zuorong, Yang Yiqian, Ma Hezhong
1998, 24(2): 200-202.
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The impact protections provided by several aircrew helmet components are investigated in using the SHPB apparatus.The energy absorption rates of these components are examined.The impact process and energy absorption process are discussed.Further,the way in which the material mechanical properties of...
High Cycle Fatigue Model Based on Brittle Damage Mechanism
Xiao Yingchun, Li Songnian, Gao Zhentong
1998, 24(2): 203-206.
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An isotropic continuum damage mechanics model for high cycle fatigue derived from irreversible thermodynamic dissipative theory is presented.The model is different from Lemaitre model in damage mechanisms.The former is based on a brittle mechanism,and the later is ductile.The model incorporates succ...
State DecompositionEnergy Method for Analysis of Debonding Problem of Honeycomb Sandwich Plates
Miao Changqing, Meng Qingchun, Zhang Xing
1998, 24(2): 207-211.
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A sandwich plate with debonding between the face plates and honeycomb core is considered.A mechanical analysis model is built to study a honeycomb sandwich plate with debonding by state decomposition method.Analysis for debonding of honeycomb sandwich plates is carried out the by method of additiona...
Advanced Technology in the Design of Environmental Control System for Avionics Pods
Yu Jianzu, Qian Yiji, Gao Zexi, Gao Cheng
1998, 24(2): 212-215.
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Abstract:
To ensure the reliability of equiments mounted in the avionics pods, an environmental control system (ECS) should be equipped in the pod independently. There are two difficulties in designing pod ECS: one is that the aircraft has no enough electrical power to drive the pod ECS; another is that some ...
High Speed Machining of Grey Cast Iron Using CBN Tools
Chen Wuyi, D.K.Aspinwall
1998, 24(2): 216-219.
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The cutting performance of CBN tools when machining grey cast iron with different pearlite/ferrite ratio at high cutting speed up to 1100 m/min was investigated concerning tool flank and crater wear,tool life and the influence of oxygen rich atmosphere.It was found that nose wear of Amborite was sli...
Mathematic Model of Process Dimension Parameter Planning
Chen Zhitong, Du Pei
1998, 24(2): 220-223.
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Since nearly all of the dimension parameters in technological process planning are coupled together,manual method in the process dimension parameter planning(PDPP) is not always efficient and effective.In order to increase design efficiency and effect, an essential mathematic model about PDPP is est...
Study on Weibull Distribution for Large Scale Complex System's R&D Budge Expense Estimation
Xu Zhe, Feng Yuncheng
1998, 24(2): 224-227.
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Study on budget of expense for large complex systems is the primary problem in the filed of cost analysis.Weibull timedependent expense model is an econometric model about manpower and finance for large complex systems,and also called life cycle model.In this paper Weibull distribution characteristi...
Competitive Strategy of Enterprises and Manufacturing Systems' Dynamic Development
Zheng Yun, Wei Fajie
1998, 24(2): 228-232.
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In today's world manufacturing system has to meet new challenges for the market needs changing day by day. In order to meet the changes of the market, to form self-competition superiority, and to have great ability to deal with the changes, manufacturing system must have the character istic of conti...
Numerical Simulation of Vortical Flows over Fighter Configuration with Euler Equations
Zhang Zhengke, Zhu Ziqiang, Zhuang Fenggan
1998, 24(2): 233-236.
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A three-stage explicit scheme is used for time-stepping solutions of Euler equations discretized in physical curvilinear grid cell of finite volume simulating vortical flows over a generic fighter configuration. The predicted pressure distribution on wing surface is in good agreement with experiment...
Computation of Near Sea Flight Vehicle Reflection from Sea and Sky Background Radiation
Xu Nanrong, Lei Jianchang
1998, 24(2): 237-240.
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The reflective characteristics of sea and sky background radiation,which have important effect on the infrared signature from flight vehicle above sea,are studied in the paper.The statistical distribution of wave facet directions is discussed,the effects of randomly riging and falling sea wave on th...
Design and Investigation of Pulse Combustors
Cheng Xianchen
1998, 24(2): 241-244.
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It presents results obtained in an ongoing project at BUAA,stemming from the need to develop more ratinoal design methods.It discusses the effect of parameters of main elements of pulse combustors,including combustor chamber,tail pipe,injector and reactant supply system upon its performance,in the a...
Application of Multivariate Analysis in Studying the GraduateSchools' Scales of Universities in China
Xu Huijuan, Wang Huiwen
1998, 24(2): 245-248.
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Using part of the graduate schools' data in 1994 from 18 Chinese polytechnic universities with the State Council approved graduate schools,and by means of factor analysis and cluster analysis,two factors are extracted from the eight variables standing for the graduate schools' scales of the 18 Chine...

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