Abstract
Recently, the importance of the joint design of identification and control has been recognized, and several controller design methods based on the iteration of identification and controller re-design have been proposed. In these methods, the frequency weighted identification plays an important role. On the other hand, as a powerful identification method, subspace state-space system identification (4SID) method has been proposed. However, it is difficult to use the frequency weight in conventional 4SID methods. Therefore in this paper, we propose a frequency weighted 4SID method for the joint design of identification and control, and choose the appropriate frequency weighting function for identification considering the cost function of the controller design. Furthermore, the effectiveness of the proposed method is evaluated by numerical examples.
