Research On Viriable Structure Attitude Control For Flexible Spacecraft

Study of this dissertation is of a large flexible attachment of flexible spacecraft to study the large angle attitude maneuvers and vibration during motor inhibition. Flexible Spacecraft Vibration Suppression of attachment space on the present task of great significance. This paper studies the following.First analyzed the background and the subject of the purpose and significance of the subject. Dynamic modeling of flexible spacecraft attitude control method and a variety of current development are discussed. Process for the variable structure control chattering problem, a positive input shaper and the position feedback compensator and vibration suppression of two of their profiles are described.Then the Lagrangian method gives a flexible spacecraft nonlinear dynamic equations and modal analysis to facilitate simulation into the ordinary differential often, for subsequent analysis and design of attitude control basis.The role of disturbance torque for the flexible design of spacecraft attitude control problems of the classic controller and variable structure controller, the simulation analysis and compare them. Simulation results show that variable structure control can be better vibration suppression accessories to enhance the accuracy of hub points, and greatly improve anti-jamming capability. For the use of jet thruster spacecraft as the executing agency, designed the pulse width modulated FM modulator, the system simulation results show that the modulator designed to meet the design requirements.Exist for the variable structure control chattering problem, the input shaper design and positive position feedback compensation, and were combined with the variable structure control, a complex control system. The system simulation results show that both methods can be better vibration suppression Annex vibration suppression, and has good anti-interference ability.For flexible spacecraft attitude tracking controller design for the task, were designed to track attitude change structure and the ratio differential profile tracker. For variable structure control chattering problem, the design of the hyperbolic sine function instead of sign function of the gesture tracking devices. Simulation results show that variable structure attitude tracking system tracking accuracy is much higher than the percentage differential attitude tracking system tracking accuracy, and use the hyperbolic sine function, the control torque no buffeting.