Design Based on State Space

Introduction

In the last chapters, we showed how to analysis and design linear time-invariant systems. The analysis has been done either using the state space or the transfer function descriptions. We showed also how to compute the performances of the given system. At the design phase we showed that using the transfer function description we were able to design some controllers like, the PID, the phase-lag, phase-lead or the phase lead-lag controllers. To compute the parameters of such controllers some procedures have been developed. We have also seen that the design can be done into two steps. The first one uses the specifications of the system to choose the appropriate structure of the controller. Once this is fixed, the parameters of this controller are determined using the proposed procedures.