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1998 Vol. 24, No. 1

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Study of the Simulated Test for the Intergranular Corrosion of LY12cz Al Alloy
Li Di, Zhang Qi, Wang Dizhen, Guo Baolan, Zhang Yumei
1998, 24(1): 1-4.
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The intermetallic compounds of θ(CuAl2)、S(Al2CuMg)、MnAl6 and the pure Al(L1)were used to consist a multiple electrode system．This system was employed to simulate the grain boundary area of the LY12cz alloy．The mechanism of the intergranular corrosion of LY12cz alloy was studied by the electrochemica...
Miss Distance Analysis in APN Guided Radar Homing Missiles
Ding Chibiao, Mao Shiyi
1998, 24(1): 5-8.
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The miss distance formulas under a deterministic step target maneuver and initial heading angle error are derived when augmented proportional navigation guidance (APN) is used.And the formulas of rms miss distances caused by different radar measurement noise sources are derived with adjoint theory.T...
Approximate Solution and Slotted Antenna for a Conformal Waveguide
Lü Shanwei, Gao Wenjun, Ying Jie
1998, 24(1): 9-12.
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A new waveguide made of changing a wide wall of a rectangular waveguide to a uniform curved wall is called conformal waveguide.A kind of expression of approximate solution for domain mode of the new waveguide,including symmetric,unsymmetric arc,parabolic arch,hyperbolic arch,elliptic arch,etc.,is co...
Method to Distinguish the Stronger Scattering Area by Using A 3 D Distribution Analysis
Su Donglin, Li Jianhui, Han Xuewen, Li Qing
1998, 24(1): 13-15.
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The complicated target is approximated by amounts of patches.By discreting integral equations of physical optics,the scattering fields on each patch can be calculated.Thereafter the 3 D scattering property of a complicated target versus the contour of the target can be analyzed with the knowledge of...
Control and Performance of a Turbosupercharged Piston Engine
Chen Yan, Wang Hongming
1998, 24(1): 16-20.
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The principle of control of a turbosupercharged piston engine wih Turbo Control Unit(TCU) is described.The parameters:ambient air pressure,engine speed and the throttle position(Tp) are detected and processed by TCU,which controls the waste gate of turbosupercharger.The charged air pressure and temp...
Creep Test Study of Single Crystal Turbine Blade Material
Meng Chunling, Wu Bin, Rao Shouqi
1998, 24(1): 21-23.
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he creep test of DD3 single crystal material which is made in China is carried out in order to meet the needs of creep calculation and analysis of the turbine blade made of DD3,and giving out the method of fitting creep curves according to the test's results.The creep constants,that are more exact a...
Influence of Gas Injector Geometry on Atomization Performance of Horizontally Injecting Effervescent Atomizers
Liang Xueping, Guo Zhihui, Xu Hang, Gu Shanjian
1998, 24(1): 24-27.
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The atomizing performance of effervescent atomizers are examined with special emphasis on the influence of gas injector geometry on spray characteristics.A particle dynamic analyzer (2D PDA) is used to measure mean drop size,drop size distribution and velocity distribution.All tests are carried out ...
Application of Semi Rigid Trailing to Ram Air Turbine Performance Calculating
Zhang Jianfeng, Liu Siyong
1998, 24(1): 28-30.
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Rigid trailing vortex model consistent with Goldstein hypothesis is often employed in propelles lifting line (lift surface) calculation on the condition of light load,but presents certain errors on the condition of heavy load.Semi rigid trailing vortex model consistent with Theodorsen hypothesis ext...
Reviews and Prospects in Turbulent Drag Reduction over Riblets Surface
Wang Jinjun
1998, 24(1): 31-34.
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The experimental investigations of turbulent boundary layer flow,turbulent coherent structures,turbulent drag reduction and its mechanism have been reviewed.The experimental velocities cover subsonic,transonic and supersonic flows,and the content includes: (1) flow over flat plate,revolution body an...
Solution of Euler Equations on the Two Dimentional Unstructured Grids
Yin Xingyu, Wu Zhilei, Zhu Ziqiang
1998, 24(1): 35-38.
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Both Delaunay triangulation method and advancing layers method for generation of unstructured grid are discussed.A combination of both methods to form an unique method,i.e.,the background grid is generated by using Delaunay method and space computational grid over the whole flow field is generated b...
Transient Analysis of Nonlinear Elastic Impact between Two Rods
Xing Yufeng, Zhu Dechao
1998, 24(1): 39-42.
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The two rods in colliding are treated to be an integrated rod system of vibration, so this nonlinear elastic impact problem is dealt with as a problem of conventional dynamic response analysis of the system under the initial condition that the impacting rod is subjected to a given velocity distribut...
Dynamic Model of Human Spine to Impact Loading
Zhang Jinzhi, Zhu Dongming, Mai Hanchao, Huang Zhizhong
1998, 24(1): 43-45.
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Establishing an human spine dynamic model is an significan event to study spine injured biomechanics of pilot's ejective injury,parachute opening,landing and study the endurance to impact loading on human spine.In this paper,the Huston's method of Kane's equations is developed so that it can be appl...
Bending Effects Analysis of Disk Springs
Wu Hehua, Zhang Xing
1998, 24(1): 46-49.
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The linear moment theory of shells is applied to the analysis of bending displacements and stresses in disks with the membrane displacements and stresses obtained from the non linear membrane theory of shells as the initial states.According to the results of analysis,it can be confirmed that,the ben...
Conservative Integral Photoelastic Method for Determination of Stress Intensity Factors in Fractures Mechanics
Guo Mingjie, Ruan Mengguang, Zhang Xing
1998, 24(1): 50-53.
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A conservation integral photoelasticity method is provided for determination of stress intensity factors in fracture mechanics.The displacement gradients in the expression of the concervative integral are expressed in terms of stress components.Then,the conservative integral can be evaluated by the ...
Mechanical Analysis for Debonding Problem of Honeycomb Sandwich Beams
Miao Changqing, Zhang Xing
1998, 24(1): 54-57.
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A state decomposition analytical method is proposed for analysis of additional displacements,additional internal forces and energy release rate produced by debonding between face plate and core material of a honeycomb sandwich beam.Then the influences to the odditional displacement and energy releas...
Algorithm to Minimize Total Spanding Time on Parallel machine
Jing Ling, Huang Decai, Yang Wannian
1998, 24(1): 58-59.
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The problem of scheduling of a set of jobs on parallel machines is discussed.An algorithm to minimize the total spanding time (processing time plus waiting time) is described,in which processing time of a job can be different on different machines.The mathematical model of this problem is set up.The...
Research on Drawing Wedge Test for Sheet Strips
Wang Xiufeng, Peng Weihua, Lou Jia
1998, 24(1): 60-63.
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From the theoretical analysis and numierical calculation on the drawing wedge processes of sheet strips,the law of the stress and strain distribution on the fan shaped deformation region,the change of the axial tension force,and the coefficient of the limit drawing are studied in this paper.Menwhile...
Algorithm for Rapid Codebook Generating Based on Fast Search
Liu Ping, Zhu Xinxiong
1998, 24(1): 64-67.
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Given a finite subset Wand a vector x both in k-dimension space R\+k,the method to fast locate the vector in W closest to x is of great value in various applications,and would speed up the encoding for vector quantization and the iterative process of generating codebook based on SOFM algorithm. This...
Decision Problem in the Context of Delegated Implementation
Tian Kelu, Hui Yimin
1998, 24(1): 68-70.
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With analytic tools from agency theory,the decision problem in the context of delegated implementation is analyzed.First,assumptions about the specific context of the problem are made in compliance with agency theory,on the basis of which a general model is built.Then,the general model is decomposed...
Fuzzy Analysis Approach to Project Risk
Yang Jianping, Du Duanfu
1998, 24(1): 71-74.
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Because there are lots of uncertain factors to influence a project,experts usually have to use some fuzzy words when they evaluate risks of a project.To evaluate quantitatively uncertainties of a project,this paper presents a new method of analyzing project risks.First,we can quantify these fuzzy wo...
Job Shop Scheduling by Simulated AnnealingAlgorithm Combined with Tabu Search
Han Limin, Huang Hongxuan, Feng Yuncheng
1998, 24(1): 75-78.
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This paper describes an approximation algorithm for the problem of finding the minimum makespan in a job shop.The algorithm is based on simulated annealing algorithm and tabu search,two generalizations of the well known iterative improvement approach to combinatorial optimization problems.First a st...
Grey Model of Calamity Forecast and its Application to the Calamity Forecast
Chen Yehua, Qiu Wanhua
1998, 24(1): 79-82.
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The grey system is a incomplete system of information.A new concept of \!grey number\" etc.is developed.A new analysis method is provided for the research of information and incomplete data.It is dealing with discrete raw data by using iteration addition generator method and converting to ordered se...
New Scheduling Heuristic for the Permutation Flowshop Problem
Shen Yingjun, Huang Haijun, Wu Sa, Wu Jing
1998, 24(1): 83-87.
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The permutation flowshop problem,which is a class of NP problems that are often encountered in scheduling of manufacturing systems,has not been completely solved either in theory or in application. A new heuristic method,named WSH,is proposed in this paper to solve the permutation flowshop problem. ...
Deterministic Algorithm for Global Optimization
Liang Zhixin, Wang Rishuang
1998, 24(1): 88-94.
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A deterministic algorithm for global optimization is presented.The algorithm is one of covering methods which find the global minimum with required degree of accuracy.The principle of the algorithm is region cutting.The regions which the global minimum is not included are found and cut from deeply r...
New Associative Memory System and Its Learning Convergence
Xing Chunfeng, Liu Zhongkan, Xu Ningshou
1998, 24(1): 95-99.
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A new high order Associative Memory System based on Newton forword interpolation formula (NFI AMS) used for implementing hign precision approximation to multi variable polynomial functions with arbitrarily given order is proposed.The learning algorithm of NFI AMS is designed.Moreover,it is proved th...
Microlocalizations of Modules with Regular Singularities over Filtered Rings
Zhou Meng
1998, 24(1): 100-103.
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The microlocalized properties of a module over a filtered ring R are discussed by many papers in recent years.For example,Essen proved that if M is a module with regular singularities over a Zariski ring R,then its microlocalization Q\+μ\-S(M) is a Q\+μ\-S(R) module with regular singularities.But it...
Acoustic Emission Apparatus for Rubbing Diagnosis of Large Rotating Machinery
Wu Jian, Liang Jiahui, Li Huailing
1998, 24(1): 104-107.
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In large rotating machinery using filmatic bearing (turbogenerator,air compressor,etc.) there is a potential trouble from impefect installation or running conditions,a metals' contact between rotors and shells.The trouble is usully called rubbing.The advantage of AE technologe in the rubbing diagnos...
Resistance Relexation of NiSiB Amorphous Films
Qi Xianglin, Cheng Xianan, Song Ruan, Gu Qihua
1998, 24(1): 108-111.
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A series of NiSiB films of various thickness were prepared by R.F.sputtering.The films were annealed at different temperature and for different time.The resistance of the annealed films were measured as a function of temperature during two or more heating cooling cycles.Measurements of annealed film...
Flexible Redundant Robot Dynamic Planning with Suppressing Vibration and Joint Torque Optimization
He Guangping, Lu Zhen
1998, 24(1): 112-115.
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This paper addresses the dynamic planning of flexible redundant robot to depress the vibrations and to optimize the joint torgues.It has been revealed that both vibrations and joint torques are key factors which have to be deal with.If one take one sided approach to the problem,some torques or vibra...
Wus Method for Forward Displacement Analysis of the Planar Parallel Mechanisms
Han Lin, Zhang Yu, Liang Chonggao
1998, 24(1): 116-119.
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The forward displacement analysis of the planar parallel mechanisms is studied by using Wu's method.Wu's method is a mechanical mathematics method for solving nonlinear equations.It can solve any nonlinear equations in limited steps.On the base of introducing theory of Wu's method,the problem is sol...
Approximate Solutions of the Optimal AeroassistedCoplanar Transfer of Space Vehicle
Nan Ying, Xiao Yelun, Chen Shilu
1998, 24(1): 120-123.
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Green's theorem is employed to find the quantity relationship among the constraints of heating rate,dynamic pressure and lift in reentry flight.The paper deduced the approximate solution of the optimal aeroassisted coplanar trajectories under the three typical constraints.The performance index to be...

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