Simultaneous stabilizing controller with robust servo characteristic

In this paper, we examine a design method for the simultaneous stabilizing controller with robust servo characteristic for the step signal. Several papers have been published the simultaneous stabilizing controllers. However, no paper examines a design method for the simultaneous stabilizing controllers which has robust servo characteristic for the step signal. Using designed simultaneous stabilizing controllers, the output of the control system cannot follow the step reference input without steady state error. In addition, the influence of the step disturbance cannot be attenuated. In order to solve this problem, we adapt the relationship between the simultaneous stabilization and the strong stabilization, then the problem is reduced to the strongly stabilizing controllers with interpolation problem.