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25 August 1990, Volume 10 Issue 04 Previous Issue    Next Issue

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ANALYSIS OF ENGINEERING PHYSIOLOGY ABOUT THE COOLING CAPACITY OF LIQUID EQUIPMENT Pang Cheng (Institute of Space Medico-Engineering) 1990, 10 (04):  1-7.  Abstract ( 1698 )   Save The factors affecting cooling capacity of liquid cooled suit were discussed and analyzed from points of engineering physiology. Those are:(1) liquid temperature and mass flow; (2) cooling region and flow direction; (3) amount of moisture within the suit; (4) body activities and (5) suit structure, contact area, suit insulation and methods of wearing. These factors concerned may be considered in the proper design of liquid cooled suit in order to facilitate heat exchange between the wearer and environment. Related Articles | Metrics

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LINEARIZED MASS EQUATION FOR MULTI-STAGE VEHICLE WITH SERIES OR PARALLEL PROPULSION SYSTEM Chen Jie (University of National Defence Technology) 1990, 10 (04):  8-17.  Abstract ( 1873 )   Save Vehicle system characteristics will be affected by the variations of propulsion system. It is necessary to rearrange vehicle system in order to fulfill space mission in optimal system state. In this paper the linearized mass models, similar to that in C [1], has been used to derive vehicle system mass equation for expendable, multi-stage vehicle with series or parallel propulsion system. The system mass equation has been utilized to analyze the relationship between take-off mass and design parameters for a vehicle with parallel propulsion system. Related Articles | Metrics

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A SMALL PARAMETER METHOD FOR DEGRADED SYSTEM OF LINEAR ALGEBRAIC EQUATIONS Zhou Baomin (Beijing Institute of Satellite Information Engineering) 1990, 10 (04):  18-25.  Abstract ( 1660 )   Save This paper discusses a small parameter method for solving the degraded system of linear algebraic equations, derive the brief formulae, give the method of choicing small parameter, and also prove its stability and high accuracy. Finally, some numerical results are presented. Related Articles | Metrics

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GEOMETRIC CORRECTION METHOD FOR TERRITORY SATELLITE USING COMPUTER Fan Shiming Wang Fenghua Yao Lishen Wang Yang (Beijing Institute of Satellite Information Engineering) 1990, 10 (04):  26-31.  Abstract ( 1741 )   Save The paper presents how to improve geometric correction speed for distortion image, and how to develop application software, which are limited on S600 image processing system in VAX11-750.The paper is mainly devided into three parts which are introduction of ground control points and formation of the GCP file, calculation of coefficients in polynomial and study of high speed resample method. Related Articles | Metrics

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OXYGEN PLASMA TEST EQUIPMENT FOR SPACE MATERIALS Yu Zhizhan, Wang Jingyi, Zhang Jingqin (Lanzhou Institute of Physics) 1990, 10 (04):  32-35.  Abstract ( 1697 )   Save This article describes the structure and behaviour of RF discharge oxygen plasma test equipment developed by our laboratory. The test results for kapton show that the equipment is similar in performance to that in Lockheed Missiles and Space Company and its effect is four times or more as strong as in LEO. Related Articles | Metrics

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AN ANTENNA SYSTEM FOR DFH-2A DOMESTIC TELECOMMUNICATIONS SATELLITE Chen Zhiyuan (Xi'an INST. of Space Radio Engineering) 1990, 10 (04):  36-43.  Abstract ( 1872 )   Save This paper describes a mechanically despun satellite antenna system for the domestic telecommunication service. The antenna system consists of three parts: an assembly of the omnidirectional telemetry and command antennas, a directive communications antenna and a three channel noncontacting rotary joint. The telemetry and command antennas are antennas, the radiation patterns of which are omnidirectional patterns with the circular polarization. The directive communications antenna is a offset elliptical paraboloid antenna with single horn feed for both transmiting and receiving. A 5°×8° elliptical beam radiated by the paraboloid antenna provides proper coverage over China's mainland. The three channel noncontacting rotary joint is a concentric three coaxial line configuration, which forms three transmission channels. There are chokes at the rotary join of each coaxial line. The channel insertion losses of the rotary joint are 0.6～0.8dB. The isolations between the channels are greater than 50dB. Related Articles | Metrics

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STRETCHING LENGTH ESTIMATION OF SPACE TETHER IN APPLICATION OF RECOVERABLE-CONTAINER RE-ENTERING TECHNIQUE Zhu Renzhang (Beijing Institute of Spacecraft Systems Engineering) 1990, 10 (04):  44-48.  Abstract ( 1742 )   Save It is possible that chemical propulsion device will be substituted by the space tether to enable the recoverable-container to re-enter and come back ground. The possibility of the tether and the stretching length estimation of the tether are analyzed in this article. Related Articles | Metrics

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DISCUSSION ON EARTH'S MAGNETIC FIELD PERTURBATION FORCE ACTING ON A CHARGED SATELLITE AND ITS LIFETIME Li Dayao 1990, 10 (04):  49-52.  Abstract ( 1823 )   Save This paper gives the general expression of perturbation force acting on a charged satellite by the geomagnetic field and discusses the effect of being charged on the lifetime of the satellite qualitatively. Related Articles | Metrics

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HARM OF SURVIVAL GAS AND MINUTE PARTICLE TO COMMUNICATION SATELLITE TRAVELLING WAVE TUBE AMPLIFIER He Xianze (Xi'an Inst. of Space Radio Engineering) 1990, 10 (04):  53-57.  Abstract ( 1565 )   Save The harm of survival gas and minute particle which the material vaporized to communication satellite travelling wave tube amplifier is described according to development experience; The methods to eliminate it are discussed; The typical examples of domestic and abroad are introduced. Related Articles | Metrics

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A STUDY OF CHINESE SPEECH SIGAL SAMPLE THROUGH BANDPASS Qian Hongyu Zhang Pengfei 1990, 10 (04):  58-63.  Abstract ( 1856 )   Save This paper emphasizes the study of the factors effecting remarkably the chinese tone, such as the basic frequency and so on. The classical smapling method is herein extended from lowband to bandpass frequency. In order to reduce the energy loss of the signal, the methods of complex and quadrature sampling of bandpass frequency are put forward. Based on the features of chinese speech some parameters available for reference are given. Related Articles | Metrics

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SAMPLING TEST PLAN OF ELECTRONIC PRODUCTS Xuan Daxing (Shanghai Scientific Instrument Factory) 1990, 10 (04):  64-67.  Abstract ( 2068 )   Save Electronic product's (including element ane device) reliability is an important factor determining Product quality, and sampling test is a usual means. It is desirable to determine the sampling test plan scientifically. Here, a formula determining the sampling test plan of electronic products, i. e. N_τ= (0.69 + M)/λ_0, is presented by graphing, based on probability theory. Related Articles | Metrics