Research On Dynamics And Control Of Separation And Departure Of Rendezvous And Docking

Rendezvous and docking (RVD) technology is a term of crucial technology for the activity of space development in the future, and is also a key technology of the second step of China manned spaceflight. Building ground integrated simulation system of RVD is the most effective way for studying rendezvous and docking technology.The main work of this thesis is to study the dynamics and control of the departure motion from chaser, which is named separation and departure step of RVD, and to develop a departure maneuver programming simulation system, which is a part of the ground integrated simulation system. The main achievements obtained in this dissertation are as follows.⑴The proceeding of departure is described in detail. Considering the conclusions of some references, the C-W model is much more convenient with the loss of precision than the model of high order and the high-order model considered perturbation. Based on the C-W equations, the departure dynamics model is induced, and the main constraints during the departure process are presented.⑵The glide-slope guidance algorithm which meets the need of decided time and certain number of impulse is presented. And the constraint model of line-of-sight angle is built, and the C-W guidance algorithm based on the line-of-sight angle and safety distance constraints is presented. Then the two algorithms are compared in terms of the propellant consumption, the line-of-sight angle. It's found that the two algorithms each has his strong point.⑶The concept of safe trajectory and safety criteria of departure are introduced. Based on the safety criteria of departure, the passive security of two different departure process is presented. One process is using the glide-slope guidance algorithm, and the other is using the C-W guidance algorithm based on the line-of-sight angle and safety distance constraints. It is found that the security of the C-W guidance algorithm based on the line-of-sight angle and safety distance constraints is better.⑷The prototype of departure maneuver programming simulation system, implementing the technology of object-oriented simulation, is built up. The development of the prototype makes the requirement of simulation system definite, and leads to the accumulation of experience. The prototype is expansible, and can be upgraded conveniently. The simulation results verify the effectiveness and usability of the prototype. The achievements obtained in this dissertation enrich the theoretical results of departure mission design of RVD and perfect the ground integrated simulation system of RVD, and are a well reference of China manned spaceflight, and will be beneficial for flight to moon, the outer space-exploration, space warfare, and so on.