Parallel layered scheme-based integrated orbit-attitude-vibration coupled dynamics and control for large-scale spacecraft.

This paper investigates an integrated model-control scheme for large-scale spacecraft, focusing on orbit-attitude-vibration dynamics subject to strong time-varying coupling characteristics. The proposed scheme aims to achieve cooperative modeling and control for orbit maintenance, attitude stabilization and vibration suppression simultaneously. An integrated dynamic model is established using the Absolute Nodal Coordinate Formulation and Lagrangian mechanics, where time-varying coupling terms are preserved to enhance model integrity, contrasting with the reduction and decoupling methods commonly adopted in existing literature. To address the time-varying coupling effect among the orbit, attitude, and vibration degrees of freedom, a parallel layered scheme is proposed to enable joint integrated modeling-control design while avoiding complex dynamic calculations and enhancing control precision. The scheme is directly applicable to the un-simplified time-varying coupling dynamic model. Specifically, within this parallel layered scheme, vibration control, owing to its relative independence, is separated from orbit-attitude dynamics through equivalent dynamic conversion. Consequently, a disturbance observer-based terminal sliding mode controller is developed to stabilize the orbit and attitude with vibration suppression achieved automatically via active feedback mechanism. Finally, numerical simulations of large-scale spacecraft system are conducted to demonstrate the effectiveness and performance of the proposed approach.