Identification system to dynamic characteristics of on-orbit space vehicles
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摘要: 从结构模态参数的可识别性出发,结合结构自由响应识别技术和数字处理技术,开发出大型航天器动力学特征参数在轨辨识系统,包括硬件系统和软件系统,其中软件系统由C+ +和汇编语言组合编写,系统各部分均模块化,可适用于较复杂的工程任务.在此基础上设计了模拟在轨航天器的试验验证系统,检验辨识算法和设计软件的可靠性以及航天器在轨辨识的实时性.该试验系统包括一个对称的双梁结构,利用对称结构的弱耦合可得到多个密集模态,该结构可模拟大型航天器在太空失重条件下所特有的动力学特征.试验表明系统辨识算法可靠,精度达到设计要求.Abstract: Based on the structure identifiability, some frequency-domain technologies using the free dynamic response of the structure were discussed. Including the hardware system which consists of the sensors, The data acquisition equipments, the computers and the identification software which was developed using the C+ + language and the assembly language, an identification system which was used to identify dynamic characteristics of an on-orbit space vehicle had been developed, and also a test certification system was designed to verify the reliability of the system and the identification algorithm. The test certification system consisted of a twin-beam which was weakly coupled through a flexible beam between the two beams, and could obtain several concentrated low-frequency modals. The specific dynamic characteristics which the on-orbit space vehicles had under zero-gravity conditions in space could be simulated. The test results show that the system is reliable and the precision of the identification algorithm can meet the design aims.
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[1] brahim S R. Time domain modal vibration test technique [J] Shock and Vibration Bulletin, 1973, 43(4):12～16 [2] brahim S R, Mikulcik E C. The experimental determination of vibration parameters from time responses [J] Shock and Vibration Bulletin, 1976, 46(5):183～198 [3] brahim S R, Mikulcik E C. A method for the direct identification of vibration parameters from the free response [J] Shock and Vibration Bulletin, 1977, 47(4):183～198 [4] brahim S R. Random decrement technique for modal identification of structures [J] AIAA Journal of Spacecraft and Rockets, 1977, 14(11):696～700 [5] brahim S R. Modal confidence factor in vibration testing [J] AIAA Journal of Spacecraft and Rockets, 1978, 15(5):313～316 [6] brahim S R. The use of random decrement technique for identification of structural modes of vibration [R] AIAA77368CP,1977 [7] brahim S R. Application of random time domain analysis to dynamic flight measurements [J] Shock and Vibration Bullatin, 1979, 49(2):165～170 [8] rown D, Allemang R, Zimmerman R. Parameter estimation techniques for modal analysis [R] SEApaper, 790221, 1979 [9] ppa R S, Juang J N. Some experiences with the eigen system realization algorithm [J] Sound and Vibration, 1988, 22(1):30～34 [10] 岳锋, 吕民富. 自由振动优化平均和模态隔离[J] 航空学报，1992，13(11):A627～A632Li Yuefeng, Lü Minfu. Optimized average of free vibration and modal isolation[J] Acta Aeronautica et Astronautica Sinica, 1992,13(11):A627～A632(in Chinese) [11] 阿舟, 诸德超, 姚起杭. 实用振动工程(1)[M] 北京：航空工业出版社, 1997Zhang Ezhou, Zhu Dechao, Yao Qihang. Practical vibration engineering (1) [M] Beijing：Aviation Industry Press, 1997(in Chinese) [12] 文智. Visual C+[KG-*3] .0 教程[M] 北京：电子工业出版社, 2000Liu Wenzhi. Tutorial of visual C+[KG-*3] .0[M] Beijing:Pulishing House of Electronics Industry, 2000(in Chinese) [13] 立辉. 1632 位宏汇编语言程序设计[M] 合肥：中国科学技术大学出版社, 2003Zhao Lihui. Programming of 1632 bit assemble language[M] Hefei:Press of USTC, 2003(in Chinese) [14] 志涌. 精通Matlab5.3[M] 北京：北京航空航天大学出版社, 2000Zhang Zhiyong. Master Matlab 5.3[M] Beijing:Press of Beijing University of Aeronautics and Astronautics, 2000(in Chinese) -
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