Coupling dynamic structure-persevering analysis of spatial structure with weak damping

The aeeuraey, efficiency and life of large spatial structures in orbit are affected by the plane motion, attitude and vibration. According to the structural characteristics, the sail tower space solar power station (SSPS) was simplified into a beam-spring-beam model. Weak structural damping was taken into account, and dynamic equations of the model in the orbital plane were established. The coupling dynamic behaviors and damping effects of the system were analyzed by a complex structure-persevering method combining the symplectic Runge-Kutta method and the generalized multi-symplectic method. It was found that weak damping has a slight influence on the variation of orbit radius of the spatial structure, and the ratio oi the variation to the orbit radius is the order of 10, and the change oi the attitude angle induces the deformation oi non-rigid components oi the system. This study extends the structure-persevering method into the dynamic analysis oi complicated spatial structures, which provides theoretical references ior the design and control oi these systems.