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《Research on UltraLowFrequency Nonlinear Vibration Isolation System》

LU Chun-hong;BAI Hong-bai;YANG Jian-chun;LI Zhi-zun

2010, 30 (4): 10-12. DOI: 10.3969/j.issn.1006-1355.2010.04.003

Abstract （2680）

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Based on the analysis of vibration isolation mechanism of parallel combination of positive and negative stiffness, a new type of ultralowfrequency vertical vibration isolation system is developed in this paper. In this system, the parallel connection of springs with, respectively, positive stiffness and negative stiffness is applied so that it possesses high supporting stiffness as well as ultralow kinematic stiffness. And the stiffness of the system is also nonlinear. This method has solved the problem of ultralow frequency vibration isolation in the traditional passive vibration isolator system. Through the analysis of mechanical characteristic of this system, expression of the stiffness of the isolator and zero stiffness condition of the system at the equilibrium position are deduced. This method offers a theoretical guidance for the design of new type of nonlinear ultralowfrequency vibration isolators.

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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）

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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.