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25 February 1998, Volume 18 Issue 01 Previous Issue    Next Issue

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STABILIZATION OF DEPLOYABLE/RETRACTABLE FLEXIBLE STRUCTURE Zhang Honghua (Beijing Institute of Control Engineering,Beijing 100080) 1998, 18 (01):  .  Abstract ( 1874 )   Save This paper deals with stabilization of a deployable/retractable flexible structure.A nonlinear boundary control scheme is proposed for the structure.It is proved that the vibration energy is dissipated and the damping is enhanced,thus the structure in the deploying,retracting and keeping phases is stabilized if the structure is under the control. Related Articles | Metrics

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ANALYSIS OF DYNAMICAL CHARACTERISTICS OF SPACE STRUCTURES WITH PIN JOINTS Wen Rong Wu Delong (Beijing Institute of Astronautical Systems Engineering,Beijing 100076) 1998, 18 (01):  .  Abstract ( 1580 )   Save In this paper,the analysis of the nonlinear dynamics of the pin jointed space structures with Harmonic Balance Method and Poincare Map Method is discussed.The experimental results of space deployable structure demonstrate the nonlinearities of the structure caused by the gap between joints. Related Articles | Metrics

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DEFINITION OF COMPONENT IMPORTANCE IN MULTISTATE SYSTEM Zeng Liang (National University of Defense Technology,Changsha 410073) 1998, 18 (01):  .  Abstract ( 1645 )   Save Component Importance is a quantitative criteria for different components in a system.In this paper the component importance of multistate system is discussed.The article first indicates the component importance concept of binary system,and then,based on the properties of multistate system,gives the component importance concept of multistate system.At the end of the paper,connections between are the binary system component importance and multistate monotone coherent system component importance built. Related Articles | Metrics

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ESTIMATING METHODS AND ALGORITHM OF SYSTEMATIC ERRORS IN RADAR MEASURING DATA IN FIRST FLYING STAGE OF SPACE VEHICLE Zhou Haiyin (National University of Defense Technology,Changsha 410073) 1998, 18 (01):  .  Abstract ( 1533 )   Save In this paper,it is assumed that a series of errors are in consideration,which include the constant systematic error in optical measured data,the quadratic function systematic errors and refraction residual errors in MISTRAM system's positioning data and the linear errors and refraction residual errors in velocity data.Using splines to describe the trajectory of space vehicle,the author at first establishes a nonlinear regression model of trajectory parameters and systematic errors,and then gives a high precision nonlinear estimation method and algorithm of trajectory parameters and systematic errors. Related Articles | Metrics

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ON OPTIMAL CONTROL PROBLEM WITH RESTRICTIVE CONDITION Li Dazhi (Nantong College of Medecine,Nantong 226001) Li Dayao (Beijing Institute of Space Machine and Electricity,Beijing 100076) 1998, 18 (01):  .  Abstract ( 1566 )   Save This paper deals with the multistage optimal control problem with restrictive condition,gives the basic mathematical formulation of this problem and its solving principle,discusses the optimal thrust programme in Vacuum for minimun launching mass of two stage sounding rocket in the given maximum flight altitude. Related Articles | Metrics

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THE PRECISE DESIGN OF MICROSTRIP NARROW BAND FILTER USED IN SPACEBORNE TT&C SYSTEM Cao Fuxiang,Luo Jianjun,Yuan Jianping (Northwestern Polytechnical University,Xi′an 710072) Zhang Zuquan (Xi′an Institute of Space Radio Technology,Xi′an 710000) 1998, 18 (01):  .  Abstract ( 1874 )   Save This paper studied the precise design of Microstrip Narrow Band Pass Filter(MNBPF) ,summarized a set of equations according to engineering experience,gave the corrected equation to calculate the length of resonator,compiled the CAD program,gave the data of two practical MNBPFs and measured results.From this,it is conclude that MNBPF is a good filter for spaceborne Telemetry,Tracking and Command(TT&C)system because it has the virtues of small volume,light weight,high reliability and need no adjustment. Related Articles | Metrics

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A FAULT DIAGNOSIS EXPERT SYSTEM BASED ON FAULT TREE ANALYSIS METHOD FOR SATELLITE CONTROL SYSTEM Yu Haiwen (Beijing Institute of Control Engineering,Beijing 100080) 1998, 18 (01):  .  Abstract ( 1735 )   Save In this paper,a fault diagnosis expert system based on fault tree analysis method for satellite control system is introduced,and its consideration in system design and implementation is described.This system can not only finish uncertain logical reference and description of dynamic knowledge,but also realize complex calculation.This system can be used in other areas for fault diagnosis. Related Articles | Metrics

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AN ADVANCED TEMPERATURE CONTROL SYSTEM FOR A SIMULATION CAPSULE Guo Xiucai Tong Jingyu Qie Dianfu Liu Feng (Beijing Institute of Satellite Environment Engineering,Beijing 100029) 1998, 18 (01):  .  Abstract ( 1730 )   Save A temperature control system for a new space simulator in China is introduced.Its design philosophy is very advanced and novel.On the closed temperature controlled surface of the chamber,which is 2 3m diameter and 2m long,any steady temperature controlled from 0 to 50℃ and transient temperature controlled as sine wave,trapezoid wave and triangle wave in 90 minutes are realized.The temperature deviation in whole surface is less than 0 3℃,much lower than the expected. Related Articles | Metrics

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METHOD OF ATTITUDE CAPTURE FOR GRAVITY GRADIENT SMALL SATELLITES BASED ON THE LYAPUNOV STABILIZATION PRINCIPLE Sun Zhaowei Yang Xu Yang Di (Harbin Institute of Technology,Harbin 150001) 1998, 18 (01):  .  Abstract ( 1686 )   Save This paper applies the Lyapunov stabilization principle to the attitude capture system of gravity gradient small satellites with active magnetic control method.The control terms and logic of dividing districts are given.The method of producing magnetic control torque has been presented.The result of computer simulation indicate that the method is simple and effective.The control precisien is relatively high. Related Articles | Metrics

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RADIATION EFFECTS ON MECHANICAL PROPERTIES OF CARBON FIBER/EPOXY COMPOSITES Zhang Jianke Ji Yongfu Li Zhihua (Lanzhou Institute of Physics,Lanzhou 730000) Wang Zhenliang (Institute of Modern Physics,Lanzhou 730000) 1998, 18 (01):  .  Abstract ( 1851 )   Save The mechanical properties of some carbon fiber/epoxy composites before and after radiated have been measured and compared.Some mechanism of effect on the materials and change law of the radiated materials have been analyzed and discussed in theory . Related Articles | Metrics

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INFLUENCE OF ROCKET’S RIGHT ANGLED PRISM ERROR ON AZIMUTH LAYING ACCURACY Li Qinghui Chen Liangyi Gao Limin (Xi′an Institute of Optics and Precision Mechanics,Academia Sinica,Xi′an 710068) 1998, 18 (01):  .  Abstract ( 1926 )   Save The whole formula for the reflected ray vector of the right angle prism is derived.Based on it,the influences of the prism laying and angle errors on azimuth aiming accuracy are discussed. Related Articles | Metrics

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THE DISCUSSION OF MULTIOBJECT FUZZY DECISION MODEL AND ITS APPLICATION IN MANNED SPACEFLIGHT Zhou Qianxiang (Institute of Space & Medico-Engineering,Beijing 100094) 1998, 18 (01):  .  Abstract ( 1627 )   Save In order to discuss the method of optimization decision problems related to manned spaceflight,the concept of approaching degree is firstly put forward in this paper,then the fuzzy relationship matrix is calculated and the model of multiobjective fuzzy decision model being made up on the basis of the fuzzy mathematical theory has been constructed.At last,an example of determining the number of astronauts in the manned vehicle is studied,being of consulting result. Related Articles | Metrics