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Affiliation of Author(s):机电学院

Journal:Int. Congr. Sound Vib., ICSV

Abstract:The six-DOF micro-vibration isolator is essential for high-precision space systems in attenuating the micro-vibrations of the precise instruments. Its architecture is always designed based on the cubic-configuration Stewart platform, whose six flexible modes generally have different natural frequencies resulting in multiple resonances at various frequencies such that a uniform capability of vibration isolation cannot be achieved for the six flexible modes. To solve this problem, a six-DOF micro-vibration isolator is proposed in this paper, composed of six single-axis isolators con-necting onto two rings in parallel. The dynamic isotropic design of the isolator is studied to make the six nonzero natural frequencies identical. We consider the free-floating state of the isolator in modelling and analytically derive all the twelve natural frequencies. Six design criteria are ob-tained by successively analysing the dynamic isotropic conditions. A decentralized active con-troller is then investigated for the isolator of dynamic isotropy. The controller decouples the six-DOF vibration control into six identical control of a single-axis vibration isolator. The same con-trol gains in each single-axis isolator reaches the optimum simultaneously for all the flexible modes such that a best performance of vibration isolation can be achieved. Finally, we present an example of an isolator of dynamic isotropy. With the proportional plus integral compensator, the uniform corner frequency and optimal active damping can eventually achieved.

Translation or Not:no

Date of Publication:2017-01-01

Co-author:Yang, Xiaolong,ly,Kang, Shengzheng,Chen, Bai

Correspondence Author:wht