Distributed Vibration Control For Large Space Structure Based On Control Moment Gyroscope

The large space structure has dynamic characteristics such as large scale,lightweight and large flexibility.Since with no atmospheric damping in the space,the structural vibration induced by the solar radiation and debris impact is difficult to attenuate in a short time.Therefore,it is necessary to suppress the dynamic response of large space structures.The main contents and work of the thesis are as follows:Firstly,finite element method and Lagrange equation are used to establish the dynamic equation of a hoop space truss structure with distributed control moment gyroscopes.Because of the gyroscope coupling effect with the truss structure,the eigenvalues and eigenvectors of the dynamic equation are in complex form,which is inconvenient to optimize the location allocation of the control moment gyroscopes and to design theit control law.Based on the complex modal theory,therefore,a pseudo modal matrix on the real number domain is constructed to decouple the dynamic equations.Afterwards,a composite optimization criterion considering structural vibration energy,control input energy and sensor receiving energy is proposed,and the global position optimal configuration of the control moment gyroscopes is obtained using genetic algorithm.Finally,based on the optimal placement of the control moment gyroscopes,the linear quadratic Gaussian optimal controller and the robust controller are designed,respectively.The study cases show the effectiveness of the proposed optimal location allocation algorithm and vibration suppression method.In this thesis,the finite element modeling of large space structure with distributed control moment gyroscopes is accomplished,and the location placement of the control moment gyroscopes is optimized.Two controllers are designed to actively suppress the vibration of large space structures,providing effective methods for vibration control of large space structures.