Abstract：In order to solve the low-frequency micro-vibration isolation of flywheel in spacecraft, a multi-degree-of-freedom nonlinear vibration isolation method based on quasi-zero-stiffness mechanism was proposed. A dynamic model of Stewart vibration isolation platform supported by quasi-zero-stiffness struts was established. Influences of strut’s stiffness and excitation amplitude on the vibration isolation performance were analyzed using incremental harmonic balance method. Based on flywheel’s four-degree-of-freedom linear disturbance model, a coupling dynamic model of flywheel and vibration isolation platform was established. The vibration isolation effect was analyzed using numerical simulation. The results show that this vibration isolation method can avoid the disturbance amplification of traditional linear vibration isolation at low frequency, improving the low-frequency vibration isolation performance and achieving flywheel’s full-speed vibration isolation. Meanwhile, the angular displacement response amplitude of flywheel can meet the pointing accuracy requirement of the angular momentum vector.
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