Abstract
In this paper, the influence of control moment gyroscope (CMG) on the dynamic characteristics of an inflatable space structure is studied. The absolute nodal coordinate formulation (ANCF) and the natural coordinate formulation (NCF) are used to describe the flexible components and rigid satellite in the inflatable space structure system. A model of CMG based on NCF is proposed, in which the gyro base is regarded as rigid body, and the gimbal and rotor as gyroscopic factors in the gyro base model. The dynamic equations of the gimbal and rotor are obtained by Lagrange equation. Positions of the gimbal and rotor are set by defining inertia parameters of the rigid base. The accuracy of the dynamic model of inflatable space structure is verified via commercial finite element, including the coupling dynamics between the gyro and the inflatable structure. Compared to the CMG output term and the particle-moment equivalent model, it can be concluded that the gyro output moment conforms to the physical law. The results show the feasibility of dynamic model of the rigid-flexible coupling multibody system.
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