Decentralized Control of a Large Space Structure Using Direct Output Feedback

摘要

Direct output feedback control methods are used to develop a multiple-input multiple-output controller. The controller is then applied to the Charles Stark Draper Laboratory 2 (CSDL 2) model. The CSDL 2 model is a sophisticated optical space structure representative of large flexible space structures. This model consists of 59 nodes and 23 lumped masses. The beam elements are fully connected and may support axial, transverse, and torsional deformations. NASTRAN is employed to generate modal approximations of the model as well as the mode shapes and frequencies of the resulting modes. Of the numerous modes available for the model, only the first 36 modes are utilized and implemented in the controller. The control problem is formulated in state space form and direct output feedback is implemented. The state is represented as modal amplitudes and rates. System outputs are obtained by rate sensors and control is applied by point force actuators.