Dynamics Of The Novel Space Capture Mechanism

The paper studies the dynamic modeling and simulation techniques of spatial flexible capture process.The flexible space capture technology has the characteristics of strong fault tolerance,wide application and low requirements on the control system,thus has broad application prospects.Based on the dynamic modeling technology of large deformation flexible body and the modeling technology of collision and sliding process,this paper studies the capture process of two new flexible capture technologies.The main contents include:(1)The application development of space flexible capture and the research status at home and abroad are summarized,and the related theories of dynamic modeling of flexible capture process are introduced.(2)The two-node nonlinear finite element,the absolute nodal coordinate formulation and the concentrated mass model of the rope are derived.The computational speed and accuracy of different modeling methods are studied.The collision and sliding process of the rope are modeled.A three-node sliding rope element and a simplified form are proposed.The correctness of the element is verified by comparison with the analytical solution.(3)A cable-wound capture scheme is presented.Based on the absolute coordinate method of rigid body modeling and the absolute nodal coordinate formulation,the multibody dynamic model of the flexible capture system with winding and sticking is established.The dynamic simulation of the capture process is carried out to verify the feasibility of the capture scheme.(4)A new type of controlled space net is designed.Aiming at the shortcomings that the space net is prone to rebound and shrinkage of the mesh surface after deployment,the net shape controller is designed to avoid the rebound of the net caused by excessive deformation of the net,which greatly improves the effective capture distance of rope net.Through the collision simulation under different emission deviations,the closing plan is rationally designed.The research findings in this paper are directly applied to the development of the prototype of the spatial flexible catcher.