Research On Flexible And Self-stabilized Electromagnetism Docking System

The space autonomous rendezvous and docking technology lays the foundation of in-orbit refueling, space antagonism, space assembly and other space technologies, and has been the foreland in aerospace science. Docking system is the significant part of autonomous rendezvous and docking technology. Electromagnetism docking system breaks through the problems of traditional thruster such as contamination plume, propellant consumption, and docking impact, so it has significant value to be researched.Based on the need of on-orbit refueling, this thesis has made in-depth research about the electromagnetism docking system. Aiming at designing and developing a flexible and self-stabilized electromagnetism docking system, the theoretical model analysis, finite element method and on-ground experiment have been applied to verify the feasibility and rationality of the self-designed scheme. The main works in this thesis include:(1) A new electromagnetism docking system featured with feasible and self-stabilization has been designed so as to reduce the system control difficulty. Elements and characteristic analysis of electromagnetic loop provide theoretical guidance of the scheme design. Primary design, structure design, magnetism circle design and parameters design have been made in order to understand the whole system comprehensively. Based on which, the one-dimensional dynamics model has been established to analyze the dynamic process of the electromagnetism docking system by numerical method. The emulation results validate the feasibility and rationality of the self-designed scheme.(2) Energy dynamic model of the system has been established and analyzed. The change of electromagnetic energy, mechanical energy and induced heat energy during collision are well depicted to work out the dynamic model of the system under the principle of energy conversation. By means of simulation, the feasibility of the design as well as the correctness of dynamic model is confirmed.(3) Investigation of three-dimensional model has been carried out to test the capability of the feasibility and self-stabilization of the system. Electromagnetic engineering softwares as Ansoft Maxwell are applied to analyze and calculate the three-dimensional finite element model of the system. Moreover, the dynamic characteristics with three-dimension and four-degree of freedom of the electromagnetic system are well described by interpolation upon high non-linear calculated sample point with the Kriging function. Calculation results show that the feasibility and self-stabilization of the electromagnetism docking system can well satisfy the requirement of docking in space.(4) The on-ground experiment is implemented to better validate the capability of the electromagnetism docking system. The successful design and development of the on-ground system verifies the feasibility of the docking scheme to a large extent. Different mechanism experiments according to the different working states in docking have been done to analyze the influence of parameters to the system, which provides the clews of optimization in the next period of work.