A new concept using flexible tether-net system to capture space debris is presented in this paper.With a mass point assumption the tether-net system dynamic model is established in orbital frame by applying Lagrange Equations.In order to investigate the net in-plane trajectories during after cast, the non-control R-bar and V-bar captures Generation 1 are simulated with ignoring the out-of-plane libration, the effect of in-plane libration on the trajectories of the capture net is demonstrated by simulation results.
With an effort to damp the in-plane libration, the control scheme based on tether tension is investigated firstly, after that an integrated control scheme is proposed by introduced the thrusters into the system, the nonlinear Car Diffuser close-loop dynamics is linearised by feedforward strategy, the simulation results show that feedforward controllor is effective for in-plane libration damping and enable the capture net to track an expected trajectory.