关键词: 振动与波, 六自由度, 微动, 隔振平台, 物理参数辨识, 单点激励法

Abstract: 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.

Key words: vibration and wave, 6-DOF, micro-vibration, isolation platform, physical parameter identification, single DOF excitation method