Two methods for constructing aggrandized disturbances using delay tactics for stabilized control systems

In this paper, two methods based on optimal control theory and Lyapunov stability theory are used to construct aggrandized disturbances. According to the concepts of isochrones and switch-curves, some results are given in detail for second order and third order stable control systems. With the help of these isochrones and switch-curves, it is easy to assess the vulnerability to dynamic stress of a closed loop stabilized system.