Study On Space Station Attitude Control With Momentum Management And Power Storage

Attitude control is a key technology for the development of the space station. With the background of China manned spaceflight advance study, the attitude control with momentum management and power storage is researched. The main results achieved in this dissertation are summarized as follows:The method for solving torque equilibrium attitude (TEA) and the method for judging the stability of TEA are developed. 1) Facing the complexity and low-precision of the classical method for solving TEA, a new method to obtain TEA value is proposed to improve precision and effectiveness of solving TEA, in which TEA equations are transformed into a system of nonlinear equations and the TEAs are resolved with quasi-Newton Method from these nonlinear equations. 2) The Lyapunov theory is used to judge the stability of TEA by calculating all the characteristic vectors and eigenvalues of the differential operator. The advantages of TEA as a balance attitude and the effectiveness of the stability judge method of calculating all the characteristic vectors and eigenvalues of the differential operator are proved by simulation results.A linear controller and a nonlinear controller are improved for Attitude Control/Momentum Management (ACMM). 1) An adaptive linear ACMM controller based on the in-line calculating TEAs is proposed, which achieves adaptiveness effectively. 2) An existed feedback linearized ACMM controller is improved with Cerebellar Model Articulation Control (CMAC), and the stability of the improved CMAC feedback controller is testified. 3) The ACMM can be controlled effectively by the adaptive linear controller and the CMAC feedback controller in this dissertation.The characteristic of four kinds of angular momentum exchange actuators used for attitude control and power storage are studied and summarized. These four kinds of actuators include single gimbal control moment gyroscope(SGCMG) cluster, variable speed control moment gyroscope (VSCMG) cluster, flywheel cluster, SGCMG and flywheel mixed cluster. 1) The singularity, angular momentum envelope and steering laws of SGCMG cluster for attitude control and these characteristics of VSCMG cluster, flywheel cluster, SGCMG and flywheel mixed cluster for Integrated Power and Attitude Control System (IPACS) are summarized. 2) The condition of singularity avoidance of the standard pyramid configuration VSCMG cluster is derived. 3) The advantages and disadvantages of all these four types of actuators for attitude control and power storage are summarized.Two frameworks for attitude control and power storage are proposed respectively based on momentum management and momentum feedback. 1) Integrating the merits of attitude control and IPACS, the momentum management based IPACS framework and the momentum feedback based IPACS framework are proposed. 2) It is testified theoretically that the momentum management keep the flywheel cluster and the VSCMG cluster away from saturation and singularity. The conditions of the stability for momentum feedback are analyzed. And the effectiveness of these two frameworks is proved by simulations. 3) The advantages and disadvangtages of these two frameworks are summarized.An all-purposed framework for space station attitude control is established. 1) According to China actual conditions, the possible attitude control modes and the possible attitude control momentum exchange actuators are analysized and the all-purposed framework of attitude control combining momentum management and power storage is designed for all possible attitude control tasks for long on-orbit time. 2) An active disturbance rejection controller (ADRC) is designed for earth-pointing attitude hold and attitude maneuver in this framework. 3) The effectiveness and universalness of the all-purposed framework are testified by the simulation results of test cases of three attitude control tasks with power storage, two devices modes combining SGCMGs with flywheels, two normal cases and four failure cases.This dissertation has some theoretical significance in extending the research domain of the current space station attitude control problem by combining momentum management and power storage, developing the TEA stability criterion, and proving the stability of the two proposed IPACS framework based on momentum management and based on momentum feedback. The method of resolving TEA, ACMM controllers, the performance analysis of the general angular momentum exchange actuators for IPACS, and the build of the all-purposed attitude control framework which all consider the pratical engineering requirements have some reference value for developimg China future space station attitude control technology.