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Physical Parameter Identification of the 6-DOF Micro-vibration Isolation Platform
HOU Jun-fang;LI Rong-li;WEI Huo-ming
   2011, 31 (4): 73-76.   DOI: 10.3969/j.issn.1006-1355-2011.04.017
Abstract （1517）            Save
A method for physical parameter identification of the 6-DOF isolation platform based on single point DOF excitation is proposed. In this method, the coupling relation among the 6 DOFs, which comes from the simplification of the air-spring supports due to their mechanical character, is considered. The parameter of the vertical location of gravity center of the platform is used for measuring the transfer function of the isolation system. This method includes the group-measurement of the frequency response function, the identification of the vertical location parameter of the platform’s gravity center by iteration, and the respective identification of the physical parameters of sub-systems. With this method, the problem of physical parameter identification of the platform with unknown vertical location of gravity center is solved. The basis for selection of the excitation DOF of each subsystem is analyzed. Finally, the physical parameters of the isolation platform are verified by experiment.
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《Influence of Parameter Perturbation of Micro-vibration Isolation Platform on Modal Parameters》
Hou Jun-fang;Bai Hong-bai;Tao Shuai
   2009, 29 (1): 9-13.   DOI: A
Abstract （1502）            Save
Concerning the parameter model identification problem of the 6-DOF micro-vibration isolation platform, the modal parameters identification method of the 6-DOF isolation platform was analyzed. Simulation of the variation of modal parameters caused by perturbation of the parameters in the theoretical model of the micro-vibration isolation platform was performed based on parameter perturbation re-analysis method, and the effects on modal parameter identification accuracy in modal experiment was analyzed. The results show that weak coupling is generated between part of the uncoupled modals due to unequal of the bearing stiffness in the same direction, which changes the modal frequency and mode of the system; perturbation of the vertical position of the gravity center has large impact on modal frequency of the platform; the impact of perturbation of bearing stiffness and vertical position deviation of the gravity center on modal frequency identification is not obvious, but it has evident effect on identification accuracy of the mode.
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