Quadratic Stabilization by $H^{\infty}$ Output Feedback Controllers with Adjustable Parameters

조정가능한 파라미터를 가지는 $H^{\infty}$출력궤환 제어기를 이용한 자승적 안정화

In this paper, we deal with a quadratic stabilization by $H^{\infty}$ output feedback controllers with adjustable parameters. The designed controller contains a contractive time-varying gain which can be used to adjust the responses of the resulting closed-loop system. The free parameter expressed as time-varying gain is chosen so that a Lyapunov function of the closed-loop system descends as fast as possible. A numerical example is given to show the validity of proposed method..