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25 October 1994, Volume 14 Issue 05 Previous Issue    Next Issue

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EXPERIMENTAL INVESTIGATION ON ATOMIZATION CHARACTERISTICS OF SPLASH-PLATE PLATELET INJECTOR Shen Chibing(National University of Defence Technology,Changsha 410073) 1994, 14 (05):  .  Abstract ( 1665 )   Save tomization experiment was done by using splash-plate platelet injector designed by the author, the liquid droplet mean diameter and distribution of the single injector and unielement were measured, impinging angle of the unielement was calculated,the effects of the platelets' number of every layer on atomization quality were analyzed in this paper. The results obtained provide important references for designing and improving splash-plate platelet injector. Related Articles | Metrics

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SELECTION OF NSSK CONTROL SYSTEM OF GEOSTATIONARY SATELLITE Wu Hanji;Feng Xuezhang;Liu Wenxi;Zhang Zhiyuan;An Shiming(Center for Space Science & Applied Research,Academia Sinica, Beijing 100080) 1994, 14 (05):  .  Abstract ( 2480 )   Save his paper describes briefly the reguirements of the NSSK control system of a Geostationary satellite, and then Compares the characteristics of chemical propulstion system with electrical propulsion system.Secondly,the performances and development level of several typical electric rocket engines are analysed in detail.On the basis of that, some selection criteria and opinions for NSSK control system have put forward. Related Articles | Metrics

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H_∞ IDENTIFICATION OF FLEXIBLE SPACE STRUCTURES Zhang Honghua;Wu Hongxin;Yan Gongtian;Chen Yiqing(Beijing Institute of Control Engineering,Beijing 100080) 1994, 14 (05):  .  Abstract ( 1646 )   Save his paper mainly studies the H∞ identification of Flexible Space Structures(FSS).The results denote that the low dimensional model oriented to control can be obtained by combining the estimation of the unknown parameters and truncation of the infinite dimension of the FSS based on input output data.As the dimension of the model is determined,the error between the model and the system may be minimum.As the dimension of the model increases, the error may be arbitrarily sm 11.This is the basic idea of H∞ identification of FSS. To do so, with the satellite having flexible arm as background this paper firstly analyses the dynamics properties,then introduces the concept of Had identification of FSS, thus constructs the H∞ identification algorithm of FSS, and proves the convergence of the algorithm. Related Articles | Metrics

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ATTITUDE CONTROL DURING ORBIT MANEUVER Lu Zhenduo(Beijing Institute of Control Engineering, Beijing 100080) 1994, 14 (05):  .  Abstract ( 1603 )   Save he paper discusses a general principle of attitude control during orbit maneuver.The attitude control requirements are different for two stabilized modes of a satellite.The paper emphatically analyses key teehnological problems on the control system design of three axis stabilized satellite during orbit maneuver. Related Articles | Metrics

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DOCUMENT SYSTEM AND IT'S FEATURE OF CHINA-BRAZIL EARTH RESOURCES SATELLITE(CBERS) Yang Weiyuan(Chinese Academy of Space Technology, Beijing 100081) 1994, 14 (05):  .  Abstract ( 1905 )   Save his paper presents document system of CBERS and points out it's feature, including three system-level managem ent documents,four system-level technical documents, two document trees-a tree of statement of work(SOW) and a tree of specification, eleven Interface Data Sheets (IDS) and some other documents with description of their main contents and usage. These documents may be used as a reference for satellite projects in international cooperation.Domestic satellite projects may take their advantages in order to improve management and increase development efficiency. Related Articles | Metrics

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VARIATION OF SOLAR ABSORPTANCE α_s OF THERMAL CONTROL COATING WITH ANGLE OF INCIDENCE AND ITS EFFECT Hua Chengsheng; Gu Tianzheng(Beijing Institute of Spacecraft System Engineering,Beijing 100086) 1994, 14 (05):  .  Abstract ( 2311 )   Save his paper describes the theory of the steady state caloric method for measuring solar absorptance as The variation of solar absorptance of some thermal control coatings with the temperature and the angle of incidence was measured by this method. The measured results indicated that the variation of solar absorptance with the angle of incidence is distinct for second s urface mirrors and bright anodized aluminum coatings. The absorbed solar flux of some satellites was calculated on the basis of these measured results. The calculation showed that the variation of solar absorptance with the angle of incidence must be considered to calculate precisely the absorbed solar flux for the satellites with second surface mirror or anodized aluminum coating. Related Articles | Metrics

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DEVELOPMENT OF SPECIAL IMAGE SAMPLING BOARD OF STAR SENSOR Yan Xuemei(Beijing Institute of Control Engineering, Beijing 100080) 1994, 14 (05):  .  Abstract ( 1750 )   Save here are many ways of increasing the precision of Star Sensor.Adopting the special purpose image sampling board is one of them.The article introduces an instruction and basic principle of the image sampling board.In accordance with the Philips' CCD, the article tells us how to make the pixels of CCD one-to-one correspondence with the data in memory. Related Articles | Metrics

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AN EXPERIMENTAL INVESTIGATION ABOUT ENVIRONMENT CONDITION EFFECTS ON FOCUS LOCATION OF CAMERA Wang Jinliang(Beijing Institute of Space Machine and Electricity,Beijing 100076) 1994, 14 (05):  .  Abstract ( 1509 )   Save nvironment conditions specially the tamperature and pressure variations can influence the focus location of a camera very much, so they can influence the photos quality.This paper presents an experimental method to quantitatively analyse the effects on focus location of the camera when temperature and pressure are varied. Related Articles | Metrics

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EFFECTS ON POLYMER AND COMPOSITES PROPERTIES BY ATOMIC OXYGEN EXPOSURE Sheng Lei(Beijing Institute of Space Machine and Electricity, Beijing 100076) 1994, 14 (05):  .  Abstract ( 1847 )   Save he selection of materials for spacecraft constructures requires evaluation of candidate materials which can perform reliably in the space environment.Understanding the effects of the space environment on the materials is an important step in the selection of candidate materials.This work examines the effects on polymer and composites properties induced by atomic oxygen exposure in the space low Earth orbit environment. It describes the simulated evaluation about the properties of candidate materials.lt analyses the mechanisms of the observed effects and protection meanse from damage.Considerations for the future materials development are suggested. Related Articles | Metrics