This article numerically investigates the effects of revolute joint clearance and structural flexibility on the overall dynamic\ncharacteristics of a deployable solar array system. Considering torque spring, close cable loop configuration, and lock\nmechanism, a typical mechanism composed of a main body with a yoke and two panels is used as a demonstration case\nto study the effects of clearance and flexibility on the dynamic response of the deployable solar array system in the\ndeployment and lock process. The normal contact force model and tangential friction model in clearance joint are established\nusing Lankarani Nikravesh model and modified Coulomb friction model, respectively. The numerical simulation\nresults reveal that the coupling of clearance and flexibility makes different effects on the dynamic characteristics of the\ndeployable space solar arrays for different operation stages. Besides, the clearance and flexibility of a mechanical system\nplay crucial roles in predicting accurately the dynamic response of the system, which is the foundation of mechanism\ndesign, precision analysis, and control system design.
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