Modeling and Observation of Micro-Vibration from Magnetically Suspended Flywheel Considering Base Motion

This is the authors' abstract. We don't add key points for this paper.

The dynamic characteristics of magnetically suspended flywheels (MSFs) during on-orbit operation are significantly influenced by the rigid-body motion of the hosting spacecraft. This study examines the impact of base motion on the microvibration disturbance characteristics of MSFs through both theoretical modeling and experimental validation. Focusing on a five-degree-of-freedom Ampère force MSF, a coupled dynamic-control model is developed that incorporates air-gap variations between the rotor and stator induced by base motion. A disturbance model for electrical runout, originating from rotor surface roughness, is derived based on the physical mechanism of electrical runout generation. This model is used to analyze the microvibration behavior of the MSF and the influence of base motion through simulation. Spectral analysis reveals that rotor unbalance is the primary source of synchronous-frequency disturbances, whereas electrical runout is a major contributor to harmonic components. Moreover, the amplitude of microvibration disturbances is shown to be sensitive to base motion. To further quantify the impact of base motion, a disturbance transfer model at the MSF installation interface is formulated using a modified dynamic mass method. The results demonstrate that disturbances influenced by base motion are strongly dependent on rotor mass. The theoretical findings are validated through ground-based microvibration testing, employing a test setup designed to emulate the “free–free” boundary conditions representative of the on-orbit dynamic conditions. The experimental results confirm the accuracy of the developed theoretical models and analytical conclusions.