Dynamics analysis of planar rigid-flexible coupling deployable solar array system with multiple revolute clearance joints

This paper numerically analyzes action of journal at clearance joint and interaction of journal between multiple clearance joints to reveal the dynamic behavior of planar rigid-flexible coupling solar array system considering joint clearance in depth. A typical solar array model used is composed of a rigid main-body described by Nodal Coordinate Formulation (NCF) and two flexible panels described by Absolute Nodal Coordinate Formulation (ANCF). The system consists of two torque springs, one closed cable loop (CCL) configuration, two latch mechanisms and two clearance joints. The normal contact force effect and tangential friction effect at clearance joint are considered by using nonlinear contact force model and amendatory Coulomb friction model, respectively. Action and interaction of clearance joints are studied to indicate motion property of journal in initial phase, deployment phase and post-lock phase, which provide foundations for effect analysis of overall dynamic behavior. Then comparison results reveal the effects of joint clearance, panel flexibility and their coupling on dynamics of solar array system at these three phases. Coupled with clearance at collision phase, elastic vibration property of flexible panels dominates to cause system shock; while coupled with clearance at contact phase, suspension damping property of flexible panels dominates to steady the system. Finally, rational distribution of clearance size may provide a way to balance wear degree between joints. Decrease joint clearance with more intense collision could reduce the wear depth and balances wear degree between clearance joints.