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25 June 1987, Volume 7 Issue 03 Previous Issue    Next Issue

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THE DEVELOPMENT OF SATELLITE POSITION DETERMINATION AND COMMUNICATION SYSTEM Chen Fangyun, Liu Zhikui, Feng Ruining and She Zhichao 1987, 7 (03):  1-8.  Abstract ( 1806 )   Save This paper proposes to develop satellite based position determination and communication system which may be urgently needed by many departments of the country. The composition of the two—geostationary satellite system is described and the feasibility of the system is discussed in this paper. A part of the results of the design work is given and further research problems are pointed out。 Related Articles | Metrics

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A STUDY OF RIGID SOLAR ARRAY SUBSTRATE Chen Aiming Li Jinggui This paper describes the design of rigid solar array substrate and (?) theoretic analysis and the test. 1987, 7 (03):  9-14+70.  Abstract ( 1855 )   Save This solar array substrate is aluminium honeycomb with carbon fiber face sheets. It was completd that the test consists of the model test and the vibration test. The theoretic analysis is performed using a finite element mathematical model. The results of the tests are in agreement with those of the theoretic analysis.The authors have solved the technique for the measurment of parameters of mechanical properties of the various composite material structural members and obtained the necessary datum. Related Articles | Metrics

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GEOMETRIC DISTROTION CORRECTION FOR SATELLITE PANORAMIC PICTURE Guo Zhaozeng, Duan Yongli, Li Li 1987, 7 (03):  15-23.  Abstract ( 1986 )   Save A model for geometric correction of satellite panoramic picture is presented in this paper. The model consists of three parts:1. A model for geometric correction of satellite panoramic picture in presented.2. The formular for calculating satellite attitude motion and method for calculating satellite motion on orbit are discussed.3. The system identification used to estimate satellite attitude data in the model. Related Articles | Metrics

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DEVELOPMENT OF A VUILLEUMIER CYCLE CRYOGENIC REFRIGERATOR FOR SPACEBORNE Wu Chun zhi(Lanzhou Institute of Physics) 1987, 7 (03):  24-35.  Abstract ( 1697 )   Save This paper describes the status of the development of Vuilleumier cycle cryogenic refrigerator for spaceborne, It can be used for Infra-red radar, advanced night vision and forward vision in field or airplane, This refigerator has some advantages such as small vibration, long life and high reliability。A optimum design method has been used, various structural parameters have been selected accurately by computer programmings。A special two stroke driving mechanism in the same plane, a favourable heat exchanger and advanced magnetic driver has been designed, The two types single stage 77K VM refrigerators, air cooling and liquid cooling, have been developed。 A number of test have proved that the performance and target of refrigerator have achieved designed requirement, operation is stable and reliable.Subject Term: Spacecraft, Refrigeration technique, Cryogenic equipment, Optimum design. Related Articles | Metrics

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AN OUTLINE OF SPACE STATION Fan Jianfeng 1987, 7 (03):  36-44.  Abstract ( 1981 )   Save The space station is unlike any manned spacecraft, it is a permanent facility in space. A space station will permit quantum leaps in our research on science, on space technology, and in metals and lifesaving medicines which can be manufactured only in space. This paper deals with various aspects of space station such as composition of space station system, configurations, key technology, application and future development. Related Articles | Metrics

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THE EFFICIENCY OF THE INTEGRAL EQUATION METHODS IN ASTRONAUTICAL MATHEMATICS Huang Leide(Tung-ji University, Shanghai) 1987, 7 (03):  45-54.  Abstract ( 2124 )   Save This paper presents some examples to explain that the integral equation methods (or the integral transforms) play an important role in the astronautical mathematics.1) We employ the Fredholm integral equation methods to solve the boundary walue problem (BVP) of free vibration of stiffened ractangular plates, which is the simpler way to determine their exact natural frequencies.2) We use the techniques of Fourier and Laplace transforms to solve the BVP of unsteady transonic flows, which not only simplify the solving process but also satisfy the far field boundary automatically. Thus, a closed formula solution can be obtained.3) We employ the linearized integral theory to solve the three dimensional unsteady flow in a shear layer, which simplify the procedure analysis and produce an explicit formula for the wall pressure.4) Using the Fourier transforms and evolution integral techniques to treat the phase equations of the free electron laser, we can get a formula which describe self-consistently the nonlinear three-dimensional steady-state free electron laser amplifier. Related Articles | Metrics

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THE ONE OF THERMAL PHYSICAL PROPERTIES OF CARBON FIBRE/EPOXY—RESIN COMPOSITES—THERMAL CONDUCTIVITY Zhang Jianke (Lanzhou Physics Institute) 1987, 7 (03):  55-60.  Abstract ( 4719 )   Save The relations between thermal conductivity of carbon fibre/epoxy-resin composites and various volume concentrations of fibre V_f and temperature have been discussed. The thermal conduction mechanism of Carbon fibre/epoxyresin is researched and a lot of results are given in this paper. Related Articles | Metrics

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UNSTEAY HEAT CONDUCTION IN THREE-LAYERED SLABS NOZZLE Song Yuyang (Beijing Institute of Technology) 1987, 7 (03):  61-66.  Abstract ( 1798 )   Save This paper presents a calculation of unsteady heat conduction in three-layered slabs Nozzle of solid rocket engine, deduces a regularity of temperature distribution and the equation of temperature caclulation in every layer point out the effect of burning time and temperature inside surface of Nozzle on ablation。 Related Articles | Metrics

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STUDY ON TREATMENT OF ZnO BY POTASSIUM SILICATE Dai Xueqian, Chen Shufen (Shanghai Institute of Organic Chemistry, Academia Sinica) 1987, 7 (03):  67-70.  Abstract ( 1728 )   Save In order to improve the stability of ZnO to UV irradiation ZnO was taeated by potassium silicate with model 2—3. Solft pigment ZnO was obtained, Its content of SiO_2 is 9% and higher than reference datum. Related Articles | Metrics