Dynamic decoupling control of super static active vibration isolation platform with large mass eccentricity and spring lateral stiffness

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (1) : 1-9.

YANG Hongjie1,2, DAI Feng3, LIU Lei1,2, LI Xinguo1,2

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Abstract

Aiming at the multi-degree-of-freedom dynamic coupling problem of the ultra-quiet active vibration isolation platform induced by the eccentricity of isolated payload and the transverse stiffness of spring, the dynamic coupling characteristics of the vibration isolation platform and the decoupling vibration isolation control method are studied. Integrating the influence of the payload mass eccentricity and the spring transverse stiffness, a coupled dynamic model of the ultra-quiet active vibration isolation platform is first established. Subsequently, according to the established dynamic model, the dynamic coupling characteristics of the vibration isolation platform are analyzed, and the analytical relationship among coupling resonance frequency, spring transverse stiffness, and payload mass eccentricity is given. Finally, a decoupling vibration isolation control method based on modal space is presented, and an active vibration isolation platform based on voice coil motors is developed. The accuracy of the established dynamic model and the effectiveness of the modal decoupling vibration isolation control method are verified through experiments.

Key words

active vibration isolation / micro-vibration / modal transformation / dynamic coupling / decoupling control

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YANG Hongjie1,2, DAI Feng3, LIU Lei1,2, LI Xinguo1,2. Dynamic decoupling control of super static active vibration isolation platform with large mass eccentricity and spring lateral stiffness[J]. Journal of Vibration and Shock, 2023, 42(1): 1-9

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