Active Coordinated Deployment Of Large-Scale Optoelectronic Films On Space Power Station

In space microgravity environment, large-scale flexible structures dynamics is very complex, traditional deployment methods such as the way of progressive expansion,inflatable deployment and the rotation method relying on centrifugal force are facing huge technical challenges, especially the deployment of flexible body which is in km level, the reliability of the traditional deployment is reduced greatly. At the same time, along with the increasement of membrane area, its attitude adjustment and retainment after the deployment is becoming more and more difficult. Therefore, this paper puts forward active coordinated control method to realize reliable deployment of large-scale optoelectronic films in order to transform the control and stability of large-scale membranes into the coordinated control of formation service vehicles, and the influence emerged from the film is regarded as disturbing force in formation spacecraft control system. The main contents in this paper are as follows:First of all, the orbital and attitude motion model of service vehicles are briefly introduced, relative motion dynamics is in the form of C-W equations, attitude kinematic and dynamic equations are established based on quaternion. In order to show the telecommunication relationship among vehicles, this paper covers the knowledge of graph theory and its relevant properties of matrixes.Secondly, illustrating in-orbit assembly and deployment scheme of membranes on space power station and designing orbit coordinated controller which can ensure energetic optimum based on consistency principle. Then, the stability of the system is analyzed and the effectiveness is verified by simulation experiments.Thirdly, aiming at the attitude consistency problem of formation system in the process of film deployment on space power station, the adaptive sliding mode controller is designed. Meanwhile, the presence of time delay and space hysteresis while sliding mode vector through the sliding mode surface will make discrete controller, thus will cause the chattering control input variables. Therefore, a kind of chattering suppression of the adaptive sliding mode control method is proposed, so as to realize attitude consistency in the process of membrane deployment and unfolded attitude hold and stability.Finally, because of the coupling between relative orbital motion and relative attitude motion, coupled control method of translation and rotation based on dual quaternion is designed. In order to research vibration interferences in the course of the deployment, finite element simulation software is used for modal analysis of the thin film to obtain the natural frequency and relevant mode of vibration. Then the film transverse vibration is analyzed, introducing vibration interferences into the formation system to realize reliable simulation of formation control system which is coupling of orbit and attitude.