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25 April 1989, Volume 9 Issue 02 Previous Issue    Next Issue

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INFLUENCE OF MATRIX PERFORMANCE AND STACKING SEQUENCE ON DAMAGE IN GRAPHITE/EPOXY LAMINATES Zhao Shixi Shi Zhiqiang Chen Changqi (Beijing University of Aeronautics and Astronautics) 1989, 9 (02):  1-8.  Abstract ( 1819 )   Save The damage processes of the unnotched and notched compo-site laminates with different matrices and different stacking sequences undertensile loading and tension-compression fatigue loading have been investigatedby using penetrant enhanced x-ray radiography and ultrasonic C-scanningtechnique.The influence of the matrix performance and the stacking sequenceon the damage in the laminates is described in this paper. Related Articles | Metrics

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INFLUENCE OF SPACE ENVIRONMENT ON InSb CRYSTAL GROWTH Zhang Fangqing Zhang Li Chen Guanghua Da Daoan Huang Liangfu Xie Xie 1989, 9 (02):  9-11+31.  Abstract ( 1917 )   Save In order to investigate the effects of micro-gravity on InSbcrystal growth,remelting ang regrowth of InSb crystal were carried out inspace.The experimental results unambiguously prove that high quality crystalcan be obtained under micro gravity condition and demonstrate the feasibilityof InSb crystal growth by using remaining heat on other side in multipurposefurnace. Related Articles | Metrics

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MULTISTAGE OPTIMAL CONTROL PROBLEM AND ITS SOLVING PRINCIPLE—APPLICATION OF THE CALCULUS OF VARIATION Li Dayao 1989, 9 (02):  12-23.  Abstract ( 1695 )   Save This paper deais with the multistage optimal control problem,gives the basic mathematical formulation of this problem and its solving prin-ciple,by the calculus of variations,Especialty,the connection conditions atthe stage-to-stage seperation moments are researched in detail.This paperprovides one of the methods for solving the multistage optimal controlproblem. Related Articles | Metrics

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FINITE ELEMENT METHOD FOR GEOMETRIC DISTORTION CORRECTION OF REMOTE SENSING IMAGE Li Lingzhi He Zhiqin Guo Zhaozeng Ju Tao (Beijing Inst,of Satellite Information Engineering) 1989, 9 (02):  24-31.  Abstract ( 1904 )   Save According to selected ground control points,an optimal trian-gular net is automatically constructed.Then,a system of coefficients thattransforms triangular elements are calculated.For avoiding the possiblefailure of this calculation,some long edges of the triangles are repartitioned.Determiuant decision condition and dynamic Searching Sequence are used,sothat the geometry distortion correction is speeded up and arithmatical over-flow is avoided.In addition,a treatment for the boundary is prsented. Related Articles | Metrics

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TAILORING IN ENVIRONMENTAL SIMULATION TEST Liu Haitao (Chinese Academy of Space Technology) 1989, 9 (02):  32-37+46.  Abstract ( 1831 )   Save This paper presents concept,background and urgent need oftailoring in environmental test.Sub-squently,the tailoring technique in en-vironmental test of satellite and the points for attetion in tailoring are em-phasized. Related Articles | Metrics

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DECISION MAKING OF SPACE DEVELOPMENT OBJECTIVE BY USING ANALYTIC HIERARCHY PROCESS Zhu Yilin (Beijin Institute of Spacecraft Systems Engineering) 1989, 9 (02):  38-46.  Abstract ( 1725 )   Save This paper describes the method of AHP—Analytic Hier-archy Process used in decision of space development objective.Provided themodel is modified only a little,it can be used to solve the practical problemsabout our space technology development target. Related Articles | Metrics

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AN ESTIMATION ON MICROGRAVITY LEVEL PROVIDED FOR MATERIALS PROCESSING IN SPACE Xi Risheng Kang Yi Wang Kang (Lanzhou INST·of Physi(?)s) 1989, 9 (02):  47-50+57.  Abstract ( 1753 )   Save In this paper,the origins of the physical effect of microgra-vity that occu in fluids are described and the physical effect of microgra-vity is divided into two kinds—the first grade effect and the second gradeeffect by the mentioned ideas.We have made a relationship between spaceprocessing of various materials and the second grade physical effect ofmicrogravity,and also made and estimation for the microgravity level,onwhich various physical effect of microgravity would occur,respectively. Related Articles | Metrics

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THE NOMOGRAMS WITH HIGH ACCURACY FOR ELEVATION AND AZIMUTH ANGLES OF SATELLITE GROUND-STATION ANTENNA Wang Jueqi (Beijing Institute of Spacecraft Systems Engineeing,CAST) 1989, 9 (02):  51-57.  Abstract ( 2182 )   Save Based upon the formulae of elevation and azimuth angles forGround-station with its given altitude and the difference between its longi-tude and satellite longitude,the variation behaviors of altitude and of diffe-rence between longitudes have beed analyzed,and the Nomograms for eleva-tion and basic-value of azimuth are produced.These Nomograms may be uti-lized both in North-and in South-hemispheres,As compared with the calcu-lated values,Nomogram data ensure an accuracy of 0,1°or even higher. Related Articles | Metrics

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RESEARCH ON SEVERAL PROBLEMS IN THERMAL DESIGN FOR SPIN-STABILIZED GEOSTATIONARY SATELLITE Guo Jiurong (Beijing Institute of Spacecraft Systems Engineering) 1989, 9 (02):  58-64.  Abstract ( 1479 )   Save A study of several problems in thermal design for the spin-stabilized geostationary satellite,such as selection of main heat radiator,pro-tection from degradation of thermal control coatings and reduction of weightof thermal control subsystem is described. Related Articles | Metrics

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EXPERIMENTAL STUDY AND RESULT ANALYSIS OF CARBON FIBER COMPOSITE BEAM WITH RECTANGULAR THIN-WALL UNDER BEND AND TORSION Cheng Chuanxian Luo Youhua Zhang Xiangqun (Beijing University of Aeronautics and Astronautics) Wo Xiyuan (Beijing Institute of Electromachinery) 1989, 9 (02):  66-70.  Abstract ( 1520 )   Save This paper introduces strain distribution and determination oftorsion deformation and broken load of a M40 carbon fiber composite beamwith rectangular thin-wall under bend and torsion,The measured experi-mental data are stable.It shows that the manufacture craft of structure isreliable and satisfies the requirement of strength and stiffness of theproducts.This structure has been used in practice and the results are satis-factory. Related Articles | Metrics